EP2523684A1

EP2523684A1 - Variants of the group-6 allergens of the poaceae with reduced allergenicity by mutagenesis of proline residues

Info

Publication number: EP2523684A1
Application number: EP10795624A
Authority: EP
Inventors: Martin Wald; Andreas Nandy; Helmut Fiebig; Bernhard Weber; Helga Kahlert; Gerald Reese; Oliver Cromwell
Original assignee: Merck Patent GmbH
Current assignee: Merck Patent GmbH
Priority date: 2010-01-14
Filing date: 2010-12-17
Publication date: 2012-11-21
Also published as: RU2012134509A; CN102811735A; AU2010342532B2; AU2010342532A1; US8999348B2; JP2013516961A; RU2607373C2; CN105001315A; BR112012017303A2; US20130224251A1; JP5871818B2; CA2786935A1; US20150071953A1; CN102811735B; WO2011085782A1

Abstract

The present invention relates to the preparation and the use of recombinant variants of the group-6 allergens of the poaceae which are characterized by the fact that their IgE reactivity is reduced in comparison with the known wild-type allergens while simultaneously the reactivity with T-lyphocytes is largely retained.

Description

Variants of the group 6 allergens of sweet grasses with reduced allergenicity by mutagenesis of proline residues

Field of the invention

The present invention relates to the production and use of recombinant variants of the group 6 allergens of Poaceae (sweet grasses), which are characterized by a relation to the known wild-type allergens decreased IgE reactivity and at the same time a largely maintained reactivity with T lymphocytes.

These hypoallergenic allergen variants can be specific

Immunotherapy (hyposensitization) of patients with grass pollen allergy or for preventive treatment to avoid the expression of grass pollen allergies.

A preferred embodiment of the invention relates to variants of the allergen Phl p 6 of the meadowweed grass (Phleum pratense) in which the prolines of positions 29, 30, 57, 79 are mutated individually or in combinations.

Background of the Invention Type 1 allergies are of global importance. Up to 20% of the population in industrialized countries suffer from conditions such as allergic rhinitis, conjunctivitis or bronchial asthma.

These allergies are caused by sources of various origins such as trees and grasses (pollen), fungi (spores), mites (feces), cats or dogs. The allergen sources are released directly into the air (pollen, spores) or can be bound to diesel soot particles (pollen) or House dust (mite faeces, skin particles, hair) get into the air. Because they are allergy-causing substances in the air, it is also called aerosol allergens. The type 1 allergy-causing substances are proteins, glycoproteins or polypeptides. Upon ingestion via mucous membranes, these allergens react with the IgE molecules bound to the surface of mast cells in sensitized persons. If these IgE molecules are cross-linked by an allergen, this leads to the release of mediators (eg histamine, prostaglandins) and cytokines through the

Effector cell and thus the corresponding allergic symptoms.

Up to 40% of type 1 allergy sufferers show specific IgE reactivity

Pollen Extracts of Sweet Grasses (Burney et al., 1997, J. Allergy Clin.

Immunol. 99: 314-322; D'Amato et al., 1998, Allergy 53: 567-578; Freidhoff et al., 1986, J. Allergy Clin Immunology, 78, 1190-2002). The family of

Sweet grasses (Poaceae) comprise over 10,000 species, of which well over 20 are known to cause allergic symptoms (Andersson & Lidholm, 2003, Int. Arch. Allergy Immunol., 130: 87-107, Esch, 2008, Allergens and Allergen Immunotherapy , Clinical Allergy and Immunology Series, 107-126).

Most of the allergy-causing grasses belong to the subfamily Pooideae. In addition to occurring as wild forms grass species such as Holcus lanatus (woolly honey grass), Phalaris aquatica

(Tuberous glossy grass), Anthoxanthum odoratum (Common ryegrass), Dactylis glomerata (Common ball grass), Festuca pratensis

Meadow fescue, Poa pratensis or Lolium perenne are also cultivated cereals such as Triticum aestivum (wheat), Seeale cereale (rye) and Hordeum vulgare (barley) known members of this subfamily. One of the best-studied species of Pooideae in terms of allergens is the meadow worm grass {Phleum pratense), which is widespread worldwide as a wild plant and also plays an economic role as a pasture and hardy fodder grass.

Depending on the relative frequency in a population with which the individual allergen molecules react with the IgE antibodies of allergy sufferers, a distinction is made between major and minor allergens. Six allergens of meadowweed grass can be considered as major allergens: Phl p 1 (Petersen et al., 1993, J. Allergy Clin Immunol 92: 789-796), Phl p 5 (Matthiesen and Lowenstein, 1991, Clin Exp 21: 297-307, Petersen et al., 1992, Int. Arch. Allergy Immunol., 98: 105-109), Phl p 6 (Petersen et al., 1995, Int. Arch. Allergy Immunol., 108, 49-54 Phl p 2/3 (Dolecek et al., 1993, FEBS 335 (3): 299-304), Phl p 4 (Haavik et al., 1985, Int. Arch. Allergy Appl. Immunol. Valentina et al., 1992, Int. Arch. Allergy Immunol. 97: 287-294; Nandy et al., Biochem. Biophys. Res.

Commun., 2005, 337 (2): 563-70) and Phl p13 (Suck et al., 2000, Clin. Exp. Allergy 30: 1395-1402).

The first description of the Phl p 6 was already in 1978. One out

Meadowweed grass pollen purified protein fraction, designated "Ag19", contained an approximately 15 kDa allergen, which later ranked in the official allergen nomenclature and continued as Phl p 6

(Lowenstein, 1978, Allergy 33: 30-41; WHO / IUIS allergen nomenclature

Subcommittee, www.allergen.org). Phl p 6 is classified as a major allergen, because in about 70% of grass pollen allergy Phl p 6-reactive IgE antibodies are detectable. (Rossi et al., 2001, Allergy, 56: 1 180-85; Vrtala et al., 1999, J. Immunol. 15; 163: 5489-9).

By physico-chemical examinations of the allergen

Grass pollen extract, two protein variants were detected, the differ in their primary sequence (Blume et al., 2004, Proteomics 4: 1366-71). These isoforms are traced back to two cDNA sequences identified in grasshopper grasshopper pollen expression libraries and labeled with the WHO / IUIS designations Phl p 6.0101 (GenBank: Z27082.1, UniProt: P432 5, see Figures 15 and 16 and SEQ ID NO: 3 and SEQ ID NO: 4, with propeptide see Fig. 19 and SEQ ID NO: 9, Petersen et al., 1995, Int. Arch. Allergy Immunol., 108: 55-59) and Phl p 6.0102 ( GenBank: Y16955, UniProt: 065868, see Figures 3 and 4 and SEQ ID NO: 1 and SEQ ID NO: 2, respectively, with propeptide see Figure 20 and SEQ ID NO: 10, Vrtala et al., 1999 , J. Immunol., 15; 163: 5489-9). The proteins, each having a signal peptide, each consist of 10 amino acids and differ in only two positions (Val 14 -> He and Arg 95 His, starting from the mature Phl p 6.0101), which cause a difference in molecular weight of 5 Da (11790 Because of Phl p 6.0101 versus 1 1785 Da of Phl p 6.0102; Fig. 1).

The pollen of other sweet grass species of the family Poaceae and especially of the subfamily Pooideae may contain major allergens that cause the

Allergens of meadow grass are homologous. Such

allergenic allergens are considered as one

Allergen group summarized. The high structural homology of such related allergens, which is ultimately based on a similar amino acid sequence, causes a correspondingly high cross-reactivity of the molecules with IgE antibodies (Lorenz et al., 2009, Int. Arch. Immunol., 148: 1-17). It is also known the atopic who are allergic to major allergens of the

Grassweed grasses may have been primarily sensitized by one of the other related species of the grasses. Finally, due to this cross-reactivity, one species of grasses sensitization may be sufficient to cause an allergic reaction by other related grasses.

In pollen of meadow bluegrass (Poa pratensis), a group 6 allergen that is cross-reactive with Phl p 6 has already been detected at the protein level (Vrtala et al., 1999, J. Immunol. 15; 163: 5489-9; Niederberger et al., 1998, J. Allergy Clin Immunol 101 (2): 258-264).

In addition to the cross-reactivity of the group 6 allergens with each other, a cross-reactivity with major allergens of group 5 is known. The

Polypeptide chain of Phl p 6 shows a great similarity with an N-terminal region of the approximately 26-28 kDa Phl p 5 (Fig. 1, Fig. 2). It is believed that the allergens on a common source gene

(Petersen et al., 1995, Int. Arch. Allergy Immunol., 108: 55-59). Both proteins form α-helical secondary structures, but no β-sheet structures. An X-ray crystallographic analysis revealed that the four α-helices of Phl p 6 fold into a characteristic helical bundle (RCSB Protein Data Bank entry: 1 NLX, Fedorov et al., 2003, Fig. 1), a structure that is also found in fragments of the Phl p 5 (Rajashankar et al., 2002, Acta Cryst D58: 1175-1181; Maglio et al., 2002,

Protein Engineering 15: 635-642; Wald et al., 2007, Clin. Exp. Allergy 37: 441-450). The similarity between the allergens causes some of the Phl p 5-reactive IgE antibodies also to bind to Phl p 6 (Petersen et al., 1995, Int. Arch. Allergy Immunol., 108: 49-54, Andersson & Lidholm, 2003, Int. Arch. Allergy Immunol., 130: 87-107).

Specific immunotherapy (SIT) or hyposensitization is considered to be an effective approach to the therapeutic treatment of allergies (Fiebig 1995 Allergo J. 4 (6): 336-339, Bousquet et al., 1998, J. Allergy Clin Immunol 102 (4)). : 558-562, Cox et al., 2007, J. Allergy Clin Immunol 120: S25-85, James & Durham, 2008, Clin Exp Allergy 38: 1074-1088).

The classical therapy of injection therapy (SCIT), in which the patient subcutaneously injects natural allergen extracts in increasing doses, has been successfully used for about 100 years. The immune system of the allergic person is repeatedly confronted with allergens, whereby a reprogramming of the immune system associated with a tolerance achieved against the allergens. After uptake of the antigens from the allergen preparations by antigen-presenting cells, peptides of the antigens are presented on the cell surface. Some particular peptides, called T cell epitopes, are recognized by antigen-specific T cells. This bond leads among other things to the expression

different types of T cells with regulatory function. In the course of SIT, the regulatory T cell response leads to tolerance to the allergen, down-regulation of T _H 2 cytokines, restoration of the TH 1 _H 2 balance, suppression of allergen-specific IgE, induction of IgG4 , IgG1 and IgA antibodies, the suppression of

Effector cells (mast cells, basophils and eosinophils) and the renewal of inflamed tissue (Akdis et al., 2007, J. Allergy Clin Immunol 119 (4): 780-789; Lärche et al., 2008, Nature Reviews 6: 761 -771). The T-cell epitopes are thus of crucial importance for the therapeutic effect of the allergen preparations in hyposensitization.

Due to the existing at both IgE and T-cell level

Cross-reactivity of the major allergens of sweet grasses is a successful one

Therapy with an allergen extract from a single representative grass species is usually sufficient (Mailing et al., 1993, EAACI Position Paper:

Immunotherapy, Allergy 48: 9-35; Cox et al., 2007, J Allergy Clin Immunol 120: 25-85).

In addition to subcutaneous immunotherapy, a sublingual therapy in which the allergens or allergen derivatives are taken up via the oral mucosa comes as an alternative to injection therapy for clinical testing and application (James & Durham, 2008, Clin. Exp. Allergy 38: 1074-1088). Another possibility is treatment with expressive DNA encoding the relevant allergens (immunotherapeutic vaccination). Experimental evidence for the allergen - specific influence of the Immune responses were provided to rodents by injection of allergen-encoding DNA (Hsu et al., 1996, Nature Medicine 2 (5): 540-544, Weiss et al., 2006, Int, Aren, Allergy Immunol., 39: 332-345). In all these forms of therapy there is a fundamental risk of allergic reactions or even anaphylactic shock (Kleine- Tebbe, 2006, Allergologie, 4: 135-156). To minimize these risks, innovative preparations in the form of allergoids are used. These are chemically modified allergen extracts which have markedly reduced IgE reactivity but identical T cell reactivity compared to untreated extract (Fiebig 1995 Allergo J. 4 (6): 336-339, Kahlert et al., 1999, Int. Arch. Allergy Immunol, 120: 146-157).

Therapy optimization is possible with recombinant allergens. Defined, if necessary, to the individual

Sensitization patterns of patient-matched cocktails of high-purity, recombinantly-produced allergens could replace extracts from natural allergen sources, as these contain a larger number of immunogenic but non-allergenic accompanying proteins in addition to the various allergens. Initial clinical trials of recombinant allergens have been successful (Jutel et al., 2005, J. Allergy Clin Immunol., 116: 608-613, Valenta & Niederberger, 2007, J. Allergy Clin Immunol 119: 826- 830). Realistic perspectives, which can lead to a safe hyposensitization with recombinant expression products, provide targeted mutant recombinant allergens in which IgE epitopes are altered without adversely affecting the T-cell epitopes essential for therapy (Schramm et al., 1999, J. Immunol 162: 2406-2414). These hypoallergenic proteins could be used in higher doses during SIT, without the

Increase probability of unwanted IgE-mediated side effects. In the past, many aeroallergens (including pollen and pollen) were used

House dust mite allergens) and food allergens such

"Hypoallergenic" variants with reduced IgE binding published., Starting from the DNA unchanged allergens could, inter alia, by

Fragmentation, oligomerization, deletions, point mutations, or recombining of individual portions of an allergen (DNA shuffling) to produce and express recombinant DNA (Ferreira et al., 2006, Inflamm. & Allergy - Drug Targets 5: 5-14, Bhalla & Singh , 2008, Trends in Biotechnology 26: 153-161; Westritschnig et al., 2007, J. Immunol. 179: 7624-7634).

With regard to the group 6 allergens of grasses, only a single mutation strategy has been published so far, in which the first ninety nucleotides coding for the amino acids 1-30 of the mature Phl p 6 were deleted. The molecule was expressed as a histidine fusion molecule, purified and

examined for its immunological properties. The N-terminal deletion resulted in decreased IgE binding and reduced

Stimulability of Basophilic Granulocytes (Vrtala et al., 2007, J. Immunol., 179: 1730-1739). In a later work, the same molecule was linked to a recombinant variant of Phl p 2 to form a hybrid molecule (Linhart et al., 2008, Biol. Chem. 389: 925-933). A mutation strategy based on point mutations, as described for other allergens, has not yet been published for group 6 grass pollen allergens.

The object of the present invention was based on the provision of novel variants of the group 6 allergens of the Poaceae protein and DNA level, which are characterized by a reduced IgE reactivity largely retained the T-cell reactivity and therefore for the curative and preventive specific immunotherapy as well as the

immunotherapeutic DNA vaccination are suitable. DESCRIPTION OF THE INVENTION Surprisingly, it has been found that variants of group 6 allergens belong to the family of sweet grasses (Poaceae), in which the prolines that are present in a

Alignment of the prolines of positions 29, 30, 57, 79 in the

Amino acid sequence of the wild-type Phl p 6 correspond, individually or in

Combinations are mutated, compared to the wild-type allergens decreased IgE reactivity and at the same time a largely preserved

Reactivity with T lymphocytes and are therefore hypoallergenic.

Accordingly, the invention relates to hypoallergenic variants of group 6 allergens of the grasshopper family (Poaceae) in which the prolines corresponding in alignment to the prolongs of positions 29, 30, 57, 79 in the amino acid sequence of the wild-type Phl p 6 , mutated individually or in combinations.

Particularly preferred are allergen variants according to the invention, characterized in that the prolines are deleted or substituted.

Preference is given to hypoallergenic variants according to the invention of group 6 allergens from the subfamily Pooideae, preferably from the groups Poodae and Triticodae, preferably represented by Phleum pratense, Holcus lanatus, Phalaris aquatica, Anthoxanthum odoratum, Dactylis glomerata,

Lolium perenne, Poa pratensis, Festuca pratensis, Hordeum vulgare, Seeale cereale and Triticum aestivum. It is preferable

hypoallergenic variants of tri a 6, lake c 6 and hearing v 6 according to the invention from Triticum aestivum, Seeale cereale and Hordeum vulgare. Particular preference is given to hypoallergenic variants of group 6 allergens of the Poodae according to the invention. Preferably, these groups are 5-allergens Phl p 6, Poa p 6, Hol p 6, Lol p 6 and Pha a 6 from Phleum pratense, Lolium perenne, Poa pratensis, Holcus lanatus and Phalaris aquatica and very particularly preferred are Poa p 6 and Phl p 6, in particular Phl p 6. According to the invention are also all naturally occurring isomers, polymorphs and variants of the aforementioned allergens, and their precursor proteins.

Preferably, in the case of the hypoallergenic variants according to the invention, the prolines are mutated which, in an alignment, correspond to the prolines of positions 29, 30, 57, 79 in the amino acid sequence of the mature Phl p 6.0101 or its variants (SEQ ID NO: 4, SEQ ID NO: 7 SEQ ID NO: 8) or the mature Phl p 6.0102 (SEQ ID NO: 2), more preferably the mature Phl p 6.0102.

Although it was known that proline could exert an influence on the protein structure, targeted point mutations of proline residues were the starting point for the generation of hypoallergenic mutants of allergens only in the group 2 main allergens of house dust mite

Dermatophaogides farinae (Der f 2, replacement of proline residues by alanine) (Takai et al., 2000, Eur. J. Biochem. 267: 6650-6656). However, the IgE-binding ability and ability to stimulate basophilic cells was only slightly reduced in three point mutants, while the remaining three behaved like the unchanged allergen. The proline mutations thus showed no or only a very slight reduction in Der f 2

Allergenicity. Other strategies for the production of hypoallergenic mutants by proline exchange mutations have not been published. Thus, it was not expected for the skilled person that proline mutations would be successful as a starting point for the generation of hypoallergenic mutants of allergens.

Moreover, no allergen has yet been tested for how a specific deletion of proline residues affects the overall IgE binding ability of the protein

Expression product and what effects on the activation of allergy-relevant effector cells. The amino acid sequences of the mature Phl p 6 or the two isoforms (Phl p 6.0101, GenBank: Z27082.1, UniProt: P43215, Phl p 6.0102, GenBank: Y16955, UniProt: 065868) have 7 proline residues (Figure 1). The proline amino acid positions 29, 30, 57, 79, and 101 are directly at the beginning or end of helices and are involved in the formation of the

Protein surface involved (Figure 2). The proline residue at position 61 is part of the third helix while proline 108 is located near the C terminus.

Starting from the amino acid sequences of the Phl p 6 isoforms Phl p 6.0101 (SEQ ID NO: 4) and Phl p 6.0102 (SEQ ID NO 2), the recombinant unmodified wild-type allergen (rPhl p 6 wt, FIG genetically modified variants of the invention produced. The wild-type proteins and the hypoallergenic variants according to the invention of the further group 6 allergens of sweet grasses according to the invention, for example Poa p 6, can be prepared analogously to the preparation process shown below. These are the Proline, which in an alignment the Prolinen of the positions 29, 30, 57, 79 in the

Amino acid sequence of the wild-type Phl p 6 correspond, individually or in

Combinations are mutated, preferably by substitution or deletion.

It is advisable to prepare the allergen variants according to the invention, starting from the cloned DNA sequence by means of genetic engineering methods. Inventive production methods are the expert from

relevant laboratory regulations and publications known as

for example: E.F. Fritsch, J. Sambrook, T. Maniatis, Molecular Cloning, Cold Spring Harbor Laboratory Press, 1989.

Of course, in addition to the described variations of group 6 allergens, other changes in other positions - such as to increase hypoallergenicity - are possible. These modifications may include, for example, amino acid insertions, deletions, exchanges, and protein breakdown into fragments, as well as protein fusions or its fragments with other proteins or peptides, as well as multimers by fusions of the same proteins or fragments.

Fragments of the invention preferably comprise 20-109 amino acids, preferably 30-100 amino acids, more preferably 40-90 amino acids. Variants according to the invention additionally comprise precursor proteins such as, for example, ProPhl p 6 with an upstream, natural or artificial signal sequence, as shown, for example, in FIGS. 18, 19 and 20 (SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10).

According to the invention, fusion proteins with N- or C-terminal fusion tags (for example His tag as in FIGS. 5 and 6, MBP tag,

Expression control sequences, etc.), hybrid molecules such as, for example, fusions with other allergens or their hypoallergenic variants, or fusions of fragments in any order. Moreover, the variants according to the invention also include homologous sequences (polymorphisms (SNPs), isoforms) with an identity of the amino acid sequence of

at least 80% to the respective group 6 wild-type allergen, preferably of at least 90% to the respective group 6 wild-type allergen, more preferably of at least 95% to the respective group 6 wild-type allergen. Preferably, in these variants, one or a few amino acids are exchanged conservatively, for example a polar amino acid is substituted by another polar amino acid or a neutral by another neutral, but variants by non-conservative substitution are also inventive. Multimers preferably comprise dimers or trimers of the hypoallergenic variants of the invention joined by a

Linker sequence or directly fused.

Examples of such variants are the variants of Phl p 6.0101 according to FIGS. 17 and 18 (SEQ ID NO: 7, SEQ ID NO: 8) in which individual amino acids which are not relevant for the effect according to the invention are exchanged, or three amino acids at the N-terminus absence,

or their precursor sequences with signal peptides at the N Term and the like. Further examples of variants according to the invention are polymorphic variants such as, for example, the two isomers Phl p 6.0101 and Phl p 6.0102 itself and further variants with replacement of one or more amino acids, absence of one or more amino acids at the N- and / or C-terminus or with corresponding deletion gaps within the amino acid sequence. Likewise according to the invention are variants with

Insertions of single or multiple amino acids isolated in different positions or as a group in a position within the

Amino acid sequence or at the N and / or C-terminus.

The subject of the invention are thus also hypoallergenic variants of group 6 allergens of grasses (Poaceae), characterized in that it is a fragment or variant of a hypoallergenic variant according to the invention, or a multimer of one or more inventive, hypoallergenic variants or by in that one or more hypoallergenic variants according to the invention or their fragments, variants or multimers are constituents of a recombinant fusion protein. The invention also relates to a DNA molecule coding for a hypoallergenic variant according to the invention.

Another object of the invention is a recombinant

Expression vector containing such erfmdungsgemäßes DNA molecule operably linked to an expression control sequence. By expression control sequence is meant, for example, a promoter or a sequence segment by means of which the expression of the target protein is influenced and which is functionally connected to the target gene, but does not necessarily have to be located directly adjacent to the target gene. An article according to the invention is also a non-human one

Host organism transformed with a DNA molecule of the invention or an expression vector of the invention. An article according to the invention is a process for producing a hypoallergenic variant according to the invention by culturing a non-human host organism according to the invention and recovering the corresponding allergen variant from the culture. Suitable non-human host organisms may be pro- or

eukaryotic, single or multicellular organisms such as bacteria or yeasts. A preferred host organism according to the invention is E. coli.

The effect of the deletion of single or two closely spaced proline on the IgE-binding ability of Phl p 6 can be examined by deleting the proline 29 + 30 from proline 57, from proline 79 and from proline 101. These prolines are localized in the Phl p 6 wild-type protein in the loop regions at the beginning or end of α helices (Figure 1, Figure 2). Preferably, proline 61 and proline 108 are not changed since corresponding variants show no significant activity. Similarly, the influence of

Proline mutations in the corresponding homologous positions of the other group 6 allergens of the sweet grasses according to the invention, for example Poa p 6 on the IgE binding ability are examined out. For faster purification from high-yield purification, the coding DNA for these investigations is provided with a sequence coding for an N-terminal hexa-histidine fusion fraction (+ 6His) (FIG. 5, SEQ ID NO. 5, FIG. 6). The tag-free, usable for pharmaceutical purposes, variants of the invention and wild-type proteins are also purified by standard methods and confirm the results of His-tag proteins. Accordingly, for example, sequences coding for the proteins rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [P57] + 6His, rPhl p 6 d [P79] + 6His and rPhl p 6 d [P101] + 6His are prepared , The sequences can be expressed in all known eukaryotic and prokaryotic expression systems, preferably in E. coli. Subsequently, the proteins are purified as soluble monomers by standard methods. Finally, purity can be checked by analysis in a denaturing polyacrylamide gel (SDS-PAGE) (Figure 7). Analytical gel filtration (SEC) coupled with a refractometer (RI detector) and a multi-angle light scattering detector (MALS detector) allows the on-line determination of the molecular weight of the eluted proteins

(SEC / MALS / RI method). Thus, the analysis of rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [P57] + 6His, rPhl p 6 d [P79] + 6His and rPhl p 6 d [P101] + 6His by SEC / MALS / RI, that these variants according to the invention are in solution as pure monomers (FIG. 8, Tab. 1). The IgE-binding ability of the recombinant variants according to the invention can be determined by a method in which the proteins on a

Nitrocellulose membrane immobilized and labeled with IgE antibodies

individual sera from clinically defined grass pollen allergy sufferers (strip test). The allergen variants / antibody complexes are then stained by enzymatic reaction (Figure 9).

In this procedure, the mutant rPhl p 6 d [P101] + 6His shows similar IgE binding to all sera tested as the unaltered one

Allergen (Fig. 9). It follows that a deletion of proline 101 has no significant effect on the IgE binding ability of Phl p 6. The IgE binding of the mutants rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [P57] + 6His and rPhl p 6 d [P79] + 6His is present in the sera of various grass pollen allergy sufferers different degrees pronounced. This is due to variations in the

Composition of the IgE population of individual allergic individuals with regard to affinity and epitope specificity of the IgE antibodies. The mutants rPhl p 6 d [P57] + 6His and rPhl p 6 d [P79] + 6His show markedly reduced IgE reactivity with most sera compared to the unmodified rPhl p 6 wt + 6His. However, the lowest IgE binding is consistently found in the mutant rPhl p 6 d [P29, 30] + 6His (Figure 9).

The recombinant variants according to the invention can moreover

for their binding ability to human IgE antibodies by IgE inhibition tests (EAST). In this procedure, the allergen / IgE interaction in solution can be studied, bringing disturbing

Masking of epitopes of the test substance, as by immobilization to a membrane, can be excluded.

In the present example, two sera from grass pollen allergy sufferers are selected, which clearly differed in the strip test procedure by their IgE binding to the mutant rPhl p 6 d [P29, 30] + 6His. The serum P32 represents the group of sera remaining in the stripe

detectable IgE binding to rPhl p 6 d [P29, 30] + 6His (group "A"), while serum P82 is selected as representative of the group of sera (group "B") with undetectable reactivity (Fig. 9, Fig. 14).

In accordance with the results of the streak test, this test procedure allows the reduced IgE-binding ability of the mutants rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [P57] + 6His and rPhl p 6 d [P79] + 6His im

Compared to the unmodified rPhl p 6 wt + 6His (FIG. 10). The results of the strip test method are therefore not due to a partial occlusion of IgE epitopes, but correctly reflect the reduced IgE binding capacity of dissolved proteins. Using the serum P32, the mutant rPhl p 6 d [P101] + 6His shows an IgE binding capacity that corresponds to that of the wild-type allergen over the complete concentration range (Figure 10). When serum P82 is used, IgE binding is found to be lower only at low protein concentrations, whereas at high concentrations, IgE binding is again comparable to that of the wild-type allergen (Figure 10).

A reduction of the IgE-binding ability of Phl p 6 is thus in principle also possible by deletion of proline residue 101, but this effect is apparently so small that it can not be detected at all in the strip test method and only at low concentrations by IgE inhibition test (FIG 9, Fig. 10). The reduced IgE-binding capacity of the mutants rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [P57] + 6His and rPhl p 6 d [P79] + 6His, on the other hand, is in the stripe test procedure with the majority of allergy sufferers. Sera are easily detectable and given in the IgE inhibition tests throughout the concentration range examined (Figure 9, Figure 10).

This basically proves that the deletion of proline residues of the group 6 allergens can reduce the IgE binding ability. On the other hand, only the deletion of certain prolines results in a significantly reduced IgE binding. By means of a test with basophilic granulocytes of a clinically defined grass pollen allergy, the effect of the reduced IgE binding ability of the variants according to the invention on the activation of human effector cells in vitro can be investigated. The granulocytes used in the test are obtained from the whole blood of an allergic person, in the present example of the allergic P21. This allergic person represents those allergic persons whose IgE antibodies are in the strip test. Show a detectable binding to rPhl p 6 d [P29, 30] + 6His (group, A "; Fig. 9, 14).

At the same concentration of the recombinant wild-type allergen and the variants according to the invention rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [P57] + 6His, and Phl p 6 d [P79] + 6His rPhl p 6 d [P29 , 30] + 6His show the variants according to the invention a lower binding

membrane-bound IgE antibodies resulting in a drastically reduced activation of basophilic granulocytes (Figure 11).

The results thus demonstrate a functionally reduced allergenicity of the mutants rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [P57] + 6His and rPhl p 6 d [P79] + 6His. Thus, this test can confirm that

Proline mutations also in these two regions of Phl p 6 lowers the IgE binding ability of at least a part of allergy sufferers.

Another object of the present invention are therefore

hypoallergenic variants of group 6 allergens of the sweet grasses family (Poaceae), in which the prolines which correspond in an alignment to the prolines of positions 29, 30, 57, 79 in the amino acid sequence of the wild-type Phl p 6 are individually mutated.

A preferred subject of the present invention are hypoallergenic variants of Phl p 6 or Poa p 6, in which the prolines, which in an alignment of the prolines of positions 29, 30, 57, 79 in the

Amino acid sequence of the wild-type Phl p 6 are individually mutated.

A particularly preferred subject of the present invention are hypoallergenic variants of Phl p 6, in which the prolines, which in an alignment of the prolines of positions 29, 30, 57, 79 in the

Amino acid sequence of the wild-type Phl p 6 are individually mutated. Particular preference is given to hypoallergenic variants of group 6 allergens of the grasshopper family (Poaceae), in which the prolines which are aligned with the prolongs of positions 29, 30, 57, 79 in the

Amino acid sequence of the mature Phl p 6.0102 (SEQ ID NO: 2) correspond mutated are removed.

Another preferred subject matter of the present invention are hypoallergenic variants of group 6 allergens of the grass family (Poaceae) according to the invention, in which the prolines which are present in a

Alignment of the prolines of positions 29, 30, 57, 79 in the

Amino acid sequence of the wild-type Phl p 6 are individually removed.

Another object of the present invention are also inventive, hypoallergenic variants of group 6 allergens of the family of sweet grasses (Poaceae), in which the prolines, which in a

Alignment of the prolines of positions 29, 30, 57, 79 in the

Amino acid sequence of the wild-type Phl p 6 are individually substituted. Here proline is exemplarily replaced by leucine (L).

According to the invention, however, the prolines of the invention may be replaced by any amino acid.

In particular, according to the invention, the hypoallergenic variants rPhl p 6 d [P29], rPhl p 6 d [P30], rPhl p 6 d [P29, 30], rPhl p 6 d [P57], rPhl p 6 d [P79], rPhl p 6 P29L, rPhl p 6 P30L. rPhl p 6 P29L, P30L, rPhl p 6 P57L and rPhl p 6 P79L and the like, including all the hypoallergenic variants of the invention described below, the numbering of which follows the sequence of Phl p 6, in particular mature Phl p 6.0102.

Furthermore, these examples are not limited to variants of Phl p 6 but also relate in particular Poa p 6 and the group 6 allergens of all other grasses. In addition, the still detectable IgE-binding ability of the hypoallergenic variants of the group 6 allergens according to the invention can be further reduced by combining proline mutations. Thus, due to the greatly reduced IgE binding of the mutant rPhl p 6 d [P29, 30] + 6His and the fact that the deletion of proline 57 and 79, the IgE binding ability can be partially lowered, produces nucleic acids that the Contain mutations in combinations. Based on the DNA of the mutant rPhl p 6 d [P29, 30] + 6His, the prolines of positions 57 and 79 are either deleted or converted into the amino acid leucine.

Accordingly, sequences encoding the proteins rPhl p 6 d [P29, 30, 57] + 6His and rPhl p 6 d [P29, 30, 79] + 6His and rPhl p 6 d [P29, 30] P57L + 6His and rPhl p 6 d [P29, 30] P79L + 6His prepared. These variants encode proteins bearing proline mutations in two of the loops connecting the α helices of Phl p 6 (Figure 2).

In addition, a nucleic acid coding for rPhl p 6 d [P29, 30] P57L P79L + 6His is prepared to generate an allergen variant which has proline mutations in three loop regions (Figure 2). As mentioned above, the sequences are preferably expressed in E. coli and the proteins are purified by standard methods.

Purity is also examined by SDS-PAGE and by SEC / MALS / RI (Figure 12, Figure 13). All proteins according to the invention can thus be prepared with high purity and solubility.

The SEC / MALS / RI method reveals significant differences in the property of forming dimers for the aforementioned mutants (Figure 13, Tab. 2). For the proteins rPhl p 6 d [P29, 30, 57] + 6His, rPhl p 6 d [P29, 30] P57L + 6His and rPhl p 6 d [P29, 30] P57L P79L + 6His

Molecular masses show a clear tendency to form dimers. The proteins rPhl p 6 d [P29, 30, 79] + 6His and rPhl p 6 d [P29, 30] P79L + 6His are detected only in the monomeric form (Table 2). From this result it can be concluded that the change of the position proline 57, but not proline 79, rPhl p 6 d [P29, 30] changed so that a

Dimerisierungstendenz is induced.

Surprisingly, indeed, the determination of IgE binding capacity by the strip test method shows that the sera of allergy sufferers of the "A" group, which have a detectable IgE binding to rPhl p 6 d [P29, 30], have a markedly reduced IgE Binding to the optimized variants have (Fig. 14) Whether the Proline 57 and 79 deleted or against another

Amino acid are exchanged, obviously has no influence on the reduction of IgE binding ability as well as the ability to form dimers. It is thus shown that one at a time

existing change of several amino acid residues from the group of prolines 29, 30, 57 and 79 further reduces IgE binding significantly.

Another object of the present invention are therefore

hypoallergenic variants of group 6 allergens of the grasshopper family (Poaceae) in which the prolines corresponding in alignment to the prolines of positions 29, 30, 57, 79 in the amino acid sequence of the wild-type Phl p 6 are mutated in combinations , Preference is given to mutations by deletion and substitution by other amino acids. Each amino acid can be chosen for exchange with proline. A preferred subject of the present invention are hypoallergenic variants of Phl p 6 or Poa p 6, in which the prolines, which in an alignment of the prolines of positions 29, 30, 57, 79 in the

Amino acid sequence of the wild-type Phl p 6 correspond, are mutated in combinations.

A particularly preferred subject of the present invention are hypoallergenic variants of Phl p 6, in which the prolines, which in a Alignment of the prolines of positions 29, 30, 57, 79 in the

Amino acid sequence of the wild-type Phl p 6 correspond, are mutated in combinations. Particular preference is given to hypoallergenic variants of group 6 allergens of the grasshopper family (Poaceae), in which the prolines which are aligned with the prolongs of positions 29, 30, 57, 79 in the

Amino acid sequence of the mature Phl p 6.0102 (SEQ ID NO: 2) correspond, are mutated in combinations.

Particular preference is given to hypoallergenic variants according to the invention in which the prolines 29, 30, 57, 79 are removed in combinations. Particular preference is also given to hypoallergenic variants according to the invention in which the prolines 29, 30, 57, 79 are substituted in combinations.

Also particularly preferred are hypoallergenic variants according to the invention in which the prolines 29, 30, 57, 79 are removed and / or substituted in combinations. According to the invention, in particular the hypoallergenic variants rPhl p 6 d [P29, 30, 57], rPhl p 6 d [29, 30, 79], rPhl p 6 d [29, 30, 57, 79], rPhl p 6 d [ P29, 57], rPhl p 6 d [P30, 57], rPhl p 6 d [29, 79], rPhl p 6 d, [30, 79], rPhl p 6 d, [29, 57, 79], rPhl p 6 d [30, 57, 79], rPhl p 6 d [P29, 30] P57L, rPhl p 6 d [29, 30] P79L, rPhl p 6 d [29, 30] P57L P79L, rPhl p 6 d [P29] P30L, rPhl p 6 d [P30] P29L, rPhl p 6 d [P57] P29L P30L, rPhl p 6 d [P79] P29L P30L, rPhl p 6 d [P57, 79] P29L P30L, rPhl p 6 P29L P30L P57L, rPhl p 6 P29L P30L P79L, rPhl p 6 P29L P30L P57L P79L and the like, including all the hypoallergenic variants of the invention described below, the numbering of which follows the sequence of Phl p 6, in particular the mature Phl p 6.0102. Here proline is exemplarily replaced by leucine (L). According to the invention, however, the prolines of the invention can be replaced by any amino acid. Accordingly, all of the above are according to the invention hypoallergenic variants in which one or more prolines according to the invention are substituted by another amino acid. Furthermore, these examples are not limited to variants of Phl p 6 but also relate in particular Poa p 6 and the group 6 allergens of all other grasses. However, all listed hypoallergenic variants of Phl p 6 according to the invention of Phleum pratense are particularly preferred, in particular based on Phl p 6.0102.

T helper lymphocytes react with peptide fragments of the allergens that are generated by degradation processes in antigen-presenting cells (APC) and are presented bound to MHC class II molecules on the surface of the APC. The peptides are usually 13-18 amino acids in length, but may be longer due to the MHC class 2 side-open binding site. The main contact points of the peptide with the MHC class molecule can be found in a core sequence of about 7-10 amino acids. The allergen-specific activation of T helper lymphocytes is the

Prerequisite for their proliferation and functional differentiation (eg Treg, TH1 and T _H 2). The ability of an allergen or allergen variant to stimulate allergen-specific T lymphocytes is considered a key to their therapeutic efficacy.

All based on the allergen variants generated by Phl p 6 and Phl p 6.0102 and shown here show in experiments a substantial preservation of crucial T-cell epitopes.

Thus, for the first time, variants of the group 6 allergens of the Poaceae are described, which are novel due to the modification of proline residues

Have protein properties. The affected proline residues are in

Loop regions isolated. Only the modification of certain proline residues leads to the novel variants, which are characterized by a reduced IgE reactivity when the T cell reactivity is largely preserved and are therefore suitable for curative and preventive specific immunotherapy. Corresponding DNA molecules are suitable for immunotherapeutic vaccination.

The present invention therefore relates to the described allergen variants according to the invention, DNA molecules and recombinant expression vectors as medicaments.

According to the invention, hypoallergenic variants, DNA molecules and

Recombinant expression vectors or medicaments according to the invention can be used in particular for the prophylaxis and / or treatment of diseases and disease states.

Medicaments according to the invention are particularly suitable for the treatment and / or prophylaxis of type 1 allergies, that is to the specific one

Immunotherapy (hyposensitization) of patients with grass pollen allergy or for the preventive immunotherapy of grass pollen allergies in their release group 6 allergens of species of the Poaceae are involved.

DNA molecules according to the invention and recombinant expression vectors can be used for the corresponding immunotherapeutic and prophylactic DNA vaccination.

The invention also provides the use of at least one hypoallergenic variant according to the invention for the preparation of a

Medicament for the prevention and / or therapeutic treatment of type 1 allergies, the release of which is caused by group 6 allergens of grasses.

According to the invention, the use of at least one

DNA molecule according to the invention and / or a recombinant expression vector according to the invention including mixtures thereof in all ratios for the preparation of a medicament for immunotherapeutic DNA vaccination. The invention further provides pharmaceutical preparations containing at least one hypoallergenic variant according to the invention, a DNA molecule according to the invention and / or a recombinant expression vector according to the invention, including mixtures thereof in all ratios and optionally other active substances and / or adjuvants for the prevention and / or or therapeutic treatment of type 1 allergies.

In particular, pharmaceutical according to the invention own

Preparations for the prevention and / or therapeutic treatment of type 1 allergies, in the initiation of which group 6 allergens of grasses are causally involved.

Pharmaceutical preparations in the sense of this invention can be described as

Therapeutics can be used in human or veterinary medicine and therefore administered to humans and animals, in particular mammals such as monkeys, dogs, cats, rats or mice and in the therapeutic

Treatment of the human or animal body as well as in the

Combating the diseases listed above. They can still be used as diagnostic agents or as reagents.

When using preparations or medicaments according to the invention, the hypoallergenic variants, DNA molecules or recombinant expression vectors according to the invention are generally used analogously to known, commercially available preparations or preparations, preferably in dosages between 0.001 and 500 mg, in hypoallergenic variants about 1-500 μg , preferably 5-200 pg per dose in the maintenance phase. The preparation may be administered one or more times a day, e.g. two, three or four times a day. Typically, the doses are in one

Increased dosage phase to the maintenance dose. For this are

various schemes of dosing and conservation possible. These can be used, for example, in subcutaneous immunotherapy (SCIT).

Short-term therapies (limited number of injections before the start of the seasonal complaints, typically 4 to 7 injections), preseasonal therapies (beginning of pollen season, typically with weekly injections during the boost phase and monthly injections with the maintenance dose until the onset of the pollen season) or year-round therapies (uptake typically up to 16 weekly Injections followed by monthly injections with the

Maintenance dose, if necessary reduced dose during the pollen season). In sublingual immunotherapy with aqueous or solid preparations (tablets, wafers, etc.), the initiation of therapy may take place with or without an uptake phase. Therapy is preferably with daily doses throughout the year, but may also be preseasonal or with other regimens of application (e.g., every other day, weekly, monthly). The term "effective amount" means the amount of a drug or pharmaceutical agent which elicits a biological or medical response in a tissue, system, animal or human, e.g. sought or desired by a researcher or physician.

Moreover, the term "therapeutically effective amount" means an amount which, compared to a corresponding subject who has not received this amount, results in: improved curative treatment, cure, prevention or elimination of a disease, a disease, a disease state, suffering, interference or prevention of side effects, or even reducing the progression of a disease, condition or disorder. The term "therapeutically effective amount" also includes the amounts effective to increase normal physiological function.

Medicinal products may be administered by any suitable route, for example oral (including buccal or sublingual), rectal, pulmonary, nasal, topical (including buccal, sublingual or transdermal), vaginal or parenteral

(including subcutaneous, intramuscular, intravenous or

intradermal) routes. Such drugs can be prepared by any method known in the pharmaceutical art, such as, for example, the active ingredient with the carrier (s) or

Excipient (s) is brought together.

For parenteral application are in particular solutions, preferably oily or aqueous solutions, further suspensions, emulsions or

Implants. The allergen variants according to the invention can also

lyophilized and the resulting lyophilisates e.g. for production of

Injection preparations are used. The preparations indicated may be sterilized and / or contain adjuvants such as lubricants, preservatives, stabilizers and / or wetting agents, emulsifiers, salts for influencing the osmotic pressure, buffer substances and / or several further active ingredients. Furthermore, depot preparations, for example by adsorption on aluminum hydroxide, calcium phosphate or tyrosine, can be obtained by appropriate formulation of the allergen variants according to the invention.

Suitable carriers are organic or inorganic substances which are suitable for parenteral administration and which do not react with group 6 allergen variants according to the invention. Examples include carriers such as water, vegetable oils, benzyl alcohols, polyethylene glycols,

Glycerol triacetate, gelatin, carbohydrates, such as lactose or starch,

Magnesium stearate, talc, lanolin or Vaseline.

For administration of the medicaments according to the invention is suitable

preferably parenteral administration. In the case of parenteral

Application are the intravenous, subcutaneous, intradermal or

intralymphatic administration is particularly preferred. In case of intravenous Application, the injection can be made directly or as an addition to infusion solutions.

Medicaments adapted for parenteral administration include aqueous and non-aqueous sterile injection solutions containing anti-oxidants, buffers, bacteriostats and solubilizers through which the

Formulation is made isotonic with the blood of the recipient to be treated, as well as aqueous and non-aqueous sterile

Suspensions which may contain suspending agents and thickeners. The formulations may be administered in single or multiple dose containers, e.g. sealed ampoules and vials, presented and in

lyophilized state, so that only the addition of the sterile carrier liquid, e.g. Water for injections, needed immediately before use. Prescribed

Injection solutions and suspensions may be sterile powders,

Granules and tablets are produced.

If desired, preparations or medicaments according to the invention may contain one or more further active ingredients and / or one or more

Amplifiers (adjuvants) included.

Another object of the present invention are thus

pharmaceutical preparations containing further active ingredients and / or

Excipients. A preferred subject matter of the invention are pharmaceutical preparations according to the invention, characterized in that the other active substances are allergens or variants thereof.

Examples of suitable further active ingredients are other allergens,

especially allergens of the grasses, more preferably allergens. the subfamily Pooideae, preferably from the groups Poodae and Triticodae, preferably represented by Phleum pratense, Holcus lanatus, Phalahs aquatica, Dactylis glomerata, Lolium perenne, Poa pratensis, Hordeum vulgare, Seeale cereale and Triticum aestivum, for example Group 1-, 2-, 3-, 4-, 5-, 6-, 7-, 10-, 12- or 13-allergens and variants thereof, for example hypoallergenic variants, fragments, multimers, hybrid molecules or recombinant fusion proteins. Another

The present invention relates to pharmaceutical preparations containing at least one further excipient, particularly preferably so-called potentiators. Examples of active enhancers are

Aluminum hydroxide, monophosphoryl lipid A, activators of Toll-like

Receptors such as e.g. Lipopolysaccharides and CpG oligonucleotides, vitamin D3, mycobacterial antigens, and molecules from parasites (e.g., schistosomes or filariae), e.g. Cystatin or ES-62.

An object of the invention are also kits consisting of

separate packs of

a) a pharmaceutical preparation according to the invention containing an effective amount of a hypoallergenic variant according to the invention,

DNA molecule or recombinant expression vector

b) a pharmaceutical preparation containing an effective amount of another active pharmaceutical ingredient and / or potentiator. The kit contains suitable containers, such as boxes or boxes, individual bottles, bags or ampoules. The set may e.g. containing separate ampoules each containing a formulation according to the invention containing an effective amount of a hypoallergenic variant of the invention, a DNA molecule or a recombinant expression vector and a formulation of another drug in dissolved or in lyophilized form.

Even without further embodiments, it is assumed that a person skilled in the art can make the most of the above description. The preferred embodiments are therefore intended to be merely descriptive, but not limiting in any way

specific. The following examples are thus intended to illustrate the invention without limiting it. Unless otherwise indicated, percentages are by weight. All temperatures are in degrees Celsius.

"Usual workup": Water is added, if necessary, adjusted to pH values between 2 and 10, if necessary, depending on the constitution of the final product.

The following hypoallergenic variants according to the invention were prepared and characterized by biotechnology. The production and

However, characterization of the substances is also feasible in other ways for the skilled person. For example, the hypoallergenic variants of the invention can also be chemically synthesized. The

The hypoallergenic variants according to the invention described below are likewise provided by the invention.

Example 1: Variants of Phl p 6 with proline deletions in a single loop region

The preparation of the variants rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [P57] + 6His, and rPhl p 6 d [P79] + 6His and their immunological

Characterization is shown below. Analogously, the recombinant unmodified allergen (rPhl p 6 wt + 6His) is prepared and analyzed, and analogously, the hypoallergenic variants of the others can also be prepared

Group 6 allergens of sweet grasses and their wild-type proteins, in particular Poa p 6, according to the invention and are investigated.

Genetic Engineering:

The synthesis of the DNA coding for the variants is carried out by the

Connecting long overlapping DNA oligonucleotides and amplifying the DNA by a standard PCR procedure. The codons are chosen Concentration of a particle determined by the Rl detector and the

Light scattering of the particle was recorded by the MALS detector (Wen et al., 1996, Anal. Biochem. 240: 155-166). From this data, the

average mass of the eluting particles can be calculated with an accuracy of about 5%. SEC / MALS / RI can detect monomers, dimers, other multimers and aggregates.

The SEC / MALS / RI analysis shows that the proteins that elute in a single peak are native monomers under pure conditions (Figure 8, Table 1).

Table 1: Molecular weight of Phl p 6 wild-type and Phl p 6 variants with proline deletions in loops 1, 2, 3 or 4

¹ Calculated molecular weight based on the amino acid sequence with starting methionine (Software: EditSeq 6.0, DNA Star Inc., Madison, USA).

² Determination of particle mass by gel filtration (SEC). Indicated is the average of the mass of the eluted protein particles in the set peak window.

The refractive index detector (RL) OptilabrEX (Wyatt, Santa Barbara, USA) was used to determine the protein concentration online. The light scattering of the particles was determined with the multi-angle detector MiniDAWN Treos (Wyatt). The calculation of

Particulate mass was measured using ASTRA 5.3.2.17 (Wyatt) software via Debeye formalism with an assumed refractive index increment of 0.180 ml / g. SEC column: Superdex 200 GL 10/300 (GE Healthcare, Uppsala, Sweden). Eluent: 20 mM sodium phosphate buffer pH 7.2 with 150 mM NaCl. that the deduced amino acid sequence is based on the mature Phl p 6.0102 (Figure 3, Figure 4). The mutations for the proline deletions are introduced by using specific oligonucleotides in the PCR reactions lacking the corresponding codons for proline. These oligonucleotides are selected so that the deduced protein at the 5 -end ^{^} carries a hexa-histidine fusion component (Fig. 5, Fig. 6).

These DNAs are ligated into the expression vector pTrcHis2 Topo (Invitrogen, Carlsbad, USA) via a topoisomerase reaction. The correctness of the DNA is confirmed by sequencing.

Expression and purification:

The expression of the recombinant histidine fusion proteins takes place in

Escherichia coli (strain Top10; Invitrogen). rPhl p 6 wt + 6 His and the variants are due to the specific binding of the N-terminal

Histidine residues on a Ni2 + chelate matrix (Immobilized Metal Ion Affinity Chromatography, IMAC; Material: HiTrap, GE Healthcare, Uppsala,

Sweden) primarily cleaned. Subsequently, the recombinant

Concentrated proteins from the IMAC eluate and gel filtration (material: Superdex 75, GE Healthcare).

Biochemical analysis:

The purity of the proteins produced is first checked by SDS-PAGE followed by Coomassie staining. The analysis shows a very high degree of purity of all proteins (Fig. 7).

Analytical gel filtration (SEC) allows the separation of protein species due to their specific hydrodynamic radii. An online determination of the molecular mass can be achieved by the coupling of a

Refractometer (Rl detector) and a multi-angle light scattering detector (MALS detector) can be achieved to the chromatography system

(SEC / MALS / RI method). Here, the given at the time of measurement The absence of insoluble protein aggregates is also monitored by UV-Vis spectroscopy (photometer: Ultrospec 5300pro UV / VIS, GE Healthcare). In UV-Vis spectroscopy, a wave spectrum of the protein solution in the wavelength range of 240-800 nm is recorded. Insoluble aggregates in protein solutions absorb in the range> 300 nm wavelength, while highly soluble proteins in this range do not absorb. The

Wave spectra are typical of proteins with high solubility. The

Proteins of the invention are thus soluble under native conditions, highly pure and monomeric.

Detection of reduced IgE binding:

A simple test method for determining the reactivity of specific IgE from allergy sera is the streak test. With this method a larger number of allergy sera can be examined in parallel.

For this purpose, the test substances are bound in the same concentration and amount side by side to a strip of nitrocellulose membrane under non-denaturing conditions. A number of such

Membrane strips can be incubated in parallel with different types of allergy sera. After a washing step, the specifically bound IgE antibodies are transformed by a color reaction mediated by an anti-human

IgE / alkaline phosphatase conjugate, visible on the membrane.

The results with the Phl p 6 variants using 8 individual grass pollen allergy sera sera are shown in FIG. 9. As an important control, the IgE binding of the recombinant allergen with and without histidine fusion content is examined first. Both proteins show the same IgE binding ability. The N-terminal histidine fusion fraction used for the studies does not interfere with the binding of IgE to Phl p 6. The mutant rPhl p 6 d [P101] + 6His shows similar IgE binding to all sera tested as the unchanged allergen (Figure 9). It follows that a deletion of proline 101 has no significant effect on the IgE binding ability of Phl p 6. The IgE binding of the mutants rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [P57] + 6His and rPhl p 6 d [P79] + 6His is different in the sera of various grass pollen allergy sufferers. This is due to variations in the composition of the IgE population of individual allergic individuals with regard to the affinity and epitope specificity of the IgE antibodies. The mutants rPhl p 6 d [P57] + 6His and rPhl p 6 d [P79] + 6His show markedly reduced IgE reactivity with most sera compared to the unmodified rPhl p 6 wt + 6His. However, the lowest IgE binding is consistently found in the mutant rPhl p 6 d [P29, 30] + 6His (Figure 9). The investigation of the IgE binding capacity of dissolved test substances is carried out with an EAST inhibition test (Enzyme Allergosorbent Test). In this

Method, the allergen / IgE interaction in solution can be examined, which interfering masking of epitopes of the test substance can be excluded, for example by immobilization to a membrane.

The EAST inhibition test is carried out as follows. Microtiter plates are coated with the allergens, here rPhl p 6 wt + 6His. After removal of the unbound allergen molecules by washing, the plate is blocked with bovine serum albumin to avoid later nonspecific binding. IgE antibodies from allergic persons were incubated as single sera in a suitable dilution with the allergen-coated microtiter plates. The amount of allergen-bound IgE antibodies is elicited via an anti-HIV / alkaline phosphatase conjugate by the reaction of a

Substrates quantified photometrically to a colored end product. The binding of the IgE antibodies is inhibited by a soluble allergen or the substance to be tested (recombinant modified allergen) depending on the concentration substance-specific. The results of the IgE inhibition tests with the recombinant allergen variants of Phl p 6 shown in FIG. 10 show that a deletion of the proline residues P [29, 30], P57 and P79 causes a reduced IgE binding ability of Phl p 6. The IgE-binding capacity of the mutant d [P29, 30] is significantly lower than that of d [P57] or d [P79]. A lower inhibitory effect indicates a loss of IgE epitopes. The mutant d [P 01] shows no altered IgE binding with the serum of the grass pollen allergy P32 and only slightly reduced binding with the serum P82, which again approaches that of the wild type at high inhibitor concentration.

Evidence of the reduction of functional allergenicity:

The functional effect of mutants in the cross-linking of

membrane-bound IgE of the effector cells and their activation is then examined in vitro.

For the basophil activation test heparinized whole blood of

Grass pollen allergy sufferers with different concentrations of

Test substances incubated. Allergenic substances can bind specific IgE antibodies, which are associated with the high-affinity IgE receptors of basophilic granulocytes. The crosslinking of the IgE / receptor complexes triggered by the allergen molecules leads to a

Signal transduction, which results in the degranulation of effector cells and thus the triggering of allergic reactions in vivo. Allergen-Induced Activation of Basophil Immunocytes Can Be Established in Vitro by Quantification of the Expression of a Surface Protein Coupled to IgE Receptor Crosslink Signaling (CD203c) Kahlert et al., Clinical Immunology and Allergy in Medicine Proceedings of the EAACI 2002 (2003) Naples, Italy 739-744). The number of expressed surface proteins on a cell and the percentage of activated cells of a cell pool is determined by the binding of a cell

fluorescently labeled monoclonal antibody to the surface protein and subsequent analysis by fluorescence-activated flow cytometry highly sensitive measured.

The granulocytes used in the test are obtained in the present example from the whole blood of the allergic P21. This allergic person

represents those allergic persons whose IgE antibodies show a detectable binding to rPhl p 6 d [P29, 30] + 6His in the strip test method (group "A") -

At the same concentration of unchanged, recombinant allergens and the rPhl p 6 d [P29, 30] + 6His, the latter shows less binding to membrane-bound IgE antibodies in both donors, resulting in a drastically reduced activation of basophilic granulocytes (Figure 11).

The results thus demonstrate a functionally reduced allergenicity of the mutant rPhl p 6 d [P29, 30] + 6His. The mutants rPhl p 6 d [P57] + 6His and rPhl p 6 d [P79] + 6His show a distinctly reduced in donor P21

Activation of basophil cells. Thus, it can be confirmed with this test that proline mutations also in these two regions of Phl p 6 lowers the IgE binding ability of at least a part of allergy sufferers.

T cell reactivity of variants:

To investigate T cell reactivity, oligoclonal T cell lines of grass pollen allergy sufferers under stimulation with the unchanged allergen are established by conventional methods. In a proliferation test, the different T cell lines are stimulated with the reference allergen rPhl p 6 wt and the modified recombinant allergen variants. The Proliferation rate is determined by the incorporation of [3H] thymidine by the usual methods.

The variants rPhl p 6 d [P29, 30] + 6His, rPhl p 6 d [57] + 6His and rPhl p 6 d [79] + 6His stimulate in the investigated T cell lines to a comparable extent to the proliferation by the unmodified allergen. It can be concluded that the important T-cell epitopes are conserved.

Example 2: Variants of Phl p 6 with combinations of proline deletions in several loop regions

In the following, the preparation and immunological characterization of the variants rPhl p 6 d [P29, 30, 57] + 6His and rPhl p 6 d [29, 30, 79] + 6His is an example of hypoallergenic variants of the group 6 allergens of the Poaceae Combinations of Proline Deletions According to the

Amino acid positions of Phl p 6 wild-type (IUIS entry Phl p 6.0102) 29, 30; 57 and 79 are shown. The deleted proline residues may be located in two or three of the loop regions which are homologous to Phl p 6. Analogously, the corresponding hypoallergenic variants of the Phl p 6 wild-type isomer Phl p 6.0101 (GenBank: Z27082.1, UniProt: P43215) are prepared and investigated, and analogously, the hypoallergenic variants of the further group 6 allergens of sweet grasses according to the invention and their wild-type Proteins, in particular Poa p 6, are produced and investigated.

The codons are chosen so that the deduced amino acid sequence is based on the mature Phl p 6.0102 (Figure 3, Figure 4). The mutations for the proline deletions are introduced by using specific oligonucleotides in the PCR reactions lacking the corresponding codons for proline. The oligonucleotides are preferably chosen such that the deduced protein carries a hexa-histidine fusion portion at the 5 ^" end (Figure 5, Figure 6) .The DNAs are inserted into the expression vector pTrcHis2 Topo (Invitrogen, Carlsbad, USA) via a topoisomerase reaction. The correctness of the DNA is confirmed by sequencing. However, other common expression vectors can be used. The expression of the recombinant histidine fusion proteins can be carried out in all common eukaryotic and prokaryotic expression systems, preferably in Escherichia coli (strain Top10, Invitrogen). The variants are primarily purified by the specific binding of the N-terminal histidine residues to a Ni ²⁺ chelate matrix (Immobilized Metal Ion Affinity Chromatography, IMAC, Material: HiTrap, GE Healthcare, Uppsala, Sweden). Subsequently, the recombinant

Concentrated proteins from the IMAC eluate and gel filtration (material: Superdex 75, GE Healthcare). Biochemical analysis:

The purity of the proteins produced is first checked by SDS-PAGE followed by Coomassie staining. The analysis showed a very high degree of purity of all proteins (Figure 12). Analytical SEC, which studies the proteins under native conditions, shows that the proteins elute in a single peak. High molecular aggregates are not detected (Figure 13). The online determination of the molecular mass by MALS / Rl leads to the result that rPhl p 6 d [29, 30, 79] + 6His is pure monomer, while the eluted rPhl p 6 d [P29, 30, 57] + 6His a Mixture of monomers and dimers (Figure 13, Table 2). However, the wave spectra of both proteins recorded with UV-vis spectroscopy are typical of proteins with high solubility. Both proteins are soluble under native conditions, pure and free of precipitates, and thus fulfill the essential requirements for an accurate analysis of their specific IgE binding capacity. Table 2: Molecular weight of the Phl p 6 mutants with mutations in several loops

Particulate mass was measured using ASTRA 5.3.2.17 (Wyatt) software via Debeye formalism with an assumed refractive index increment of 0.180 ml / g. SEC column: Superdex 200 GL 10/300 (GE Healthcare, Uppsala, Sweden). Eluent: 20 mM sodium phosphate buffer pH 7.2 with 150 mM NaCl.

Detection of reduced IgE binding:

The results of a strip test with rPhl p 6 d [P29, 30, 57] + 6His and rPhl p 6 d [29, 30, P79] + 6His using 18 individual grass pollen allergy sera are shown in FIG. Surprisingly, it has been shown that the sera of allergy sufferers which still show a detectable IgE binding to rPhl p 6 d [P29, 30] in the strip test show a predominantly massively reduced IgE reactivity with the variants rPhl p 6 d [P29, 30 57] + 6His and rPhl p 6 d [29, 30, 79] + 6His (group "A": sera 21, 32, 83, 137, etc.).

It is thus clearly shown that the IgE binding ability of Phl p 6 is due to several combined deletions of prolines from different

Loop regions can be further reduced than is possible by the deletion of proline residues in only a single loop region.

T cell reactivity of variants:

The variants stimulate the proliferation of the investigated T-cell lines to a comparable extent as the unchanged allergen. It can be concluded that the important T-cell epitopes are conserved.

Example 3: Variants of Phl p 6 with combinations of proline-point mutations in several loop regions

In the following the production and immunological characterization of the variants rPhl p 6 d [P29, 30] P57L + 6His, rPhl p 6 d [29, 30] P79L + 6His and rPhl p 6 d [29, 30] P57L P79L + 6His are exemplary for hypoallergenic variants of the Poaceae group 6 allergens with combinations of proline-point mutations corresponding to the amino acid positions of the Phl p 6 wild-type (IUIS entry Phl p 6.0102) 29, 30, 57 and 79. The

Proline residues can be converted to any amino acid. Analogously, the corresponding hypoallergenic variants of the Phl p 6 wild-type isomer Phl p 6.0101 (GenBank: Z27082.1, UniProt: P43215) are prepared and investigated, and analogously, the hypoallergenic variants of the others can also be prepared

The codons are chosen so that the deduced amino acid sequence is based on the mature Phl p 6.0102 (Figure 3, Figure 4). The mutations for the Proline deletions are introduced by using specific oligonucleotides in the PCR reactions lacking the corresponding codons for proline. The oligonucleotides are preferably selected such that the deduced protein carries a hexa-histidine fusion fraction at the 5 'end (FIG. 5, FIG. 6).

The DNAs are ligated into the expression vector pTrcHis2 Topo (Invitrogen, Carlsbad, USA) via a topoisomerase reaction. The correctness of the DNA was confirmed by sequencing. However, other common expression vectors can be used.

The expression of the recombinant histidine fusion proteins can be carried out in all common eukaryotic and prokaryotic expression systems, preferably in Escherichia coli (strain Top10, Invitrogen). The variants are primarily purified by the specific binding of the N-terminal histidine residues to a Ni ²⁺ chelate matrix (Immobilized Metal Ion Affinity Chromatography, IMAC, Material: HiTrap, GE Healthcare, Uppsala, Sweden). Subsequently, the recombinant proteins are concentrated from the IMAC eluate and gel filtration is performed (material: Superdex 75, GE Healthcare).

Biochemical analysis:

The purity of the proteins produced is first checked by SDS-PAGE followed by Coomassie staining. The analysis shows a very high degree of purity of all proteins (Figure 12).

Analytical SEC, which studies the proteins under native conditions, shows that the proteins elute in a single peak. High molecular weight aggregates are not detected (Figure 13). The online determination of the molecular mass by MALS / Rl leads to the conclusion that rPhl p 6 d [29, 30] P79L + 6His is pure monomer, whereas the eluted rPhl p 6 d [P29, 30] P57L + 6His a mixture of monomers and dimers represents. rPhl p 6 d [29, 30] P57L P79L + 6His predominantly exists as a dimer (Figure 13, Tab.

The wave spectra of all proteins recorded with UV-Vis spectroscopy are typical of proteins with high solubility. The three proteins are thus soluble under native conditions, pure and free of precipitates, and thus fulfill the essential prerequisites for an accurate analysis of their specific IgE-binding capacity. Detection of reduced IgE binding:

The results of a strip assay with rPhl p 6 d [P29, 30] P57L + 6His, rPhl p 6 d [29, 30] P79L + 6His and rPhl p 6 d [29, 30] P57L P79L + 6His using 18 individual grass pollen Allergic sera are shown in Fig. 12.

Surprisingly, it turns out that the serums of allergy sufferers in the

Strip test still show a detectable IgE binding to rPhl p 6 d [P29, 30], a predominantly massively reduced IgE reactivity with the variants rPhl p 6 d [P29, 30] P57L + 6His, rPhl p 6 d [29, 30 ] P79L + 6His and rPhl p 6 d [29, 30] P57L P79L + 6His (group "A": sera 21, 32, 83, 137, etc.).

Thus, it is clearly shown that the IgG binding ability of Phl p 6 can be further reduced by several combined point mutations of prolines from different loop regions than are given by the

Point mutation of proline residues in only a single loop region is possible.

T cell reactivity of variants:

Claims

claims

1. Hypoallergenic variant of a group 6 allergen of the family

Sweet grasses (Poaceae) in which the prolines corresponding in alignment to the prolines of positions 29, 30, 57, 79 in the amino acid sequence of the wild-type Phl p 6 are mutated individually or in combinations.

2. Hypoallergenic variant according to claim 1, characterized in that the group 6 allergen Phl p is 6.

3. Hypoallergenic variant according to claim 1 or 2, characterized

characterized in that it is a fragment or a variant of a hypoallergenic variant according to claim 1 or 2 or a multimer of one or more hypoallergenic variants according to claim 1 or 2 or characterized in that one or more

Hypoallergenic variants according to claim 1 or 2 or their fragments, variants or multimers part of a recombinant

Fusion protein are.

4. DNA molecule coding for a hypoallergenic variant according to one or more of claims 1 to 3.

5. Recombinant expression vector containing a DNA molecule according to claim 4, operably linked to an expression control sequence.

6. A non-human host organism transformed with a DNA molecule according to claim 4 or a recombinant expression vector according to claim 5.

7. A method for producing a hypoallergenic variant according to one or more of claims 1 to 3 by culturing a non-human host organism according to claim 6 and obtaining the corresponding allergen variant from the culture.

8. Hypoallergenic variant according to one or more of claims 1 to 3 as a medicament.

9. DNA molecule according to claim 4 as a medicament.

10. Recombinant expression vector according to claim 5 as a medicament.

11.The use of at least one hypoallergenic variant according to one or more of claims 1 to 3 for the manufacture of a medicament for the prevention and / or therapeutic treatment of type 1 allergies, in the initiation of which group 6 allergens of grasses are causally involved.

12. Use of at least one DNA molecule according to claim 4 and / or a recombinant expression vector according to claim 5 to

Preparation of a medicament for immunotherapeutic DNA vaccination.

13. Pharmaceutical preparation containing at least one hypoallergenic variant according to one or more of claims 1 to 3, at least one DNA molecule according to claim 4 and / or at least one

Recombinant expression vector according to claim 5 and optionally further active ingredients and / or adjuvants for the prevention and / or therapeutic treatment of type 1 allergies.

14. Pharmaceutical preparation according to claim 13, characterized

in that the further active ingredients are allergens of the grasses or variants thereof.