WO2008093060A2 - Peptides and their use - Google Patents

Abstract

The present invention relates to peptides for use as antifungal agents. The peptides comprise a sequence of 5 to 15 basic amino acids wherein substantially all of the amino acids in said sequence are the same.

Description

PEPTIDES AND THEIR USE

Field of the Invention This invention relates to peptides and their use in the treatment of fungal infections.

Background to the Invention

Systemic fungal diseases (systemic mycoses) are generally chronic, very slowly induced by opportunistic causative fungi which may not normally be pathogenic but represent a major threat to susceptible patients. Susceptible individuals are those with primary (inherent) immunodeficiencies, those hospitalised or living long term with indwelling surgical devices (e.g. catheters, Hickman and central lines), those undergoing invasive surgical techniques and those with secondary immunodeficiencies as a result of HIV infection, immunoablative chemotherapy or ionising irradiation, corticosteroids or other immunosuppressive drugs, prolonged exposure to antimicrobial agents etc.

Life threatening systemic fungal infections are those in which the pathogenic organisms of the blood stream, lungs and other mucosal tissue, the liver and immune sites such as the lymph glands and spleen. The diagnosis of specific fungal diseases may be made by isolation of the causative fungus from sputum, urine, blood, or the bone marrow, or with prevalent fungus types by evidence of tissue invasion. Superficial fungal infections are generally caused by dermatophytes that involve the outer layers of the skin, hair or nails. The infections may result in a mild inflammation, and cause intermittent remissions and exacerbations of a gradually extending, scaling, raised lesion. Yeasts and moulds do not generally give rise to systemic infections in healthy individuals only in immunocompromised individuals, however healthy individuals can suffer from superficial infections. Yeast infections including oral candidiasis (oral thrush) are usually restricted to the skin, and mucous membranes although yeast infections can also be systemic. Commonly, infections appear as erythematous, often itchy, exudative patches in the axillas, umbilicus, groin, between toes, and on finger-webs. Oral thrush involves an inflamed tongue, or buccal mucosa and presents as white patches of exudate, while chronic mucocutaneous candidiasis is characterized by red, pustular, crusted, thickened lesions on the forehead or nose. C. albicans can cause superficial infections of the vaginal cavity of healthy individuals; indeed up to three quarters of all women will suffer at least one episode of vaginal thrush during their lifetime. Most of these women experience infrequent attacks and respond well to drug therapy, however in some the infection is recurrent or persistent and does not respond to drug therapy.

The treatment options for infections contributed to or caused by fungi (including yeast) are severely limited and there is an urgent need to discover new therapies which inhibit or kill such organisms.

In our co-pending application, WO 2006/018652, we describe the identification of peptides that can be used to treat microbial infections in particular dermatophytic infections such as onychomycosis. For the peptides described therein, antimicrobial activity was generally confined to large cationic peptides comprising from 28 up to 200 or more basic amino acids.

Statements of the Invention

The present invention is based in part on the finding that smaller peptides of between 5 and 15 arginine residues are highly fungicidal and as such are effective in the treatment of certain fungal infections in particular systemic fungal and yeast infections. Without wishing to be bound by theory, it is believed that, in one mode of action, the peptides can insert into the negatively charged cytoplasmic membrane of the fungus leading to cell lysis and/or a breakdown in membrane integrity and subsequently, microbial death.

According to a first aspect the invention provides a peptide for use as an antifungal agent wherein the peptide comprises a sequence of 5 to 15 basic amino acids wherein substantially all of the amino acids in said sequence are the same.

In a preferred peptide the basic amino acids are selected from lysine, arginine and histidine, in particular lysine and arginine. Preferably still the basic amino acid is arginine.

As used herein "substantially" is a relative modifier intended to indicate permissible variation from the characteristic so modified. Specifically, by "substantially all of the amino acids in said sequence of 5 to 15 amino acids are the same" it is meant that either all, or a high proportion of, the amino acids in the sequence are identical. By "high proportion" it is contemplated that 1 or 2 substitutions may be made in the sequence.

Peptides according to the invention have advantages over respective peptides of more than 15 amino acid residues since they peptides do not have associated synthesis and cell toxicity issues.

In a preferred aspect the peptide of the invention comprises a sequence of 9 to 15, for example 11 to 15, basic amino acids wherein substantially all of the amino acids in said sequence of amino acids are the same. Preferably still the peptide of the invention comprises a sequence of 9 to 13, for example 11 to 13, basic amino acids wherein substantially all of the amino acids in said sequence are the same.

Thus the present invention provides a peptide, or a peptide variant thereof, comprising an amino acid sequence according to the formula (I)

(X)_n (I)

wherein X is each of arginine or lysine and n is an integer between 5 and 15, for use as an antifungal agent.

In a preferred peptide of the invention X is arginine.

In an alternative preferred peptide of the invention X is lysine.

In a peptide of the invention n may be between 9 and 15 e.g. 9, 10, 11, 12, 13, 14 or 15. In a preferred peptide of the invention n is an integer between 11 and 15, for example between 11 and 14. Preferably n is 13 or 14. Preferably still n is 13.

In an alternative preferred peptide of the invention n is an integer between 9 and 13, for example between 11 and 13. Preferably still n is between 9 and 11.

In a peptide of formula (I), X may be a D- or L- amino acid. In a preferred aspect the invention provides a linear peptide consisting of amino acids according to formula (I).

The invention also includes known isomers (structural, stereo-, conformational & configurational) and structural analogues of the above amino acids, including peptidomimetics, and those modified either naturally (e.g. post-translational modification) or chemically, including, but not exclusively, phosphorylation, glycosylation, sulfonylation and/or hydroxylation.

In addition, the amino acid sequence of the peptide can be modified so as to result in a peptide variant that includes the substitution of at least one (for example one or two) amino acid residue in the peptide for another amino acid residue including substitutions that utilise the D rather than L form, wherein the variant retains some (typically at least 10%) or all of the biological activity of the corresponding non- variant peptide. Thus the invention provides a peptide variant in which one or more lysine or arginine residues of formula (I) is substituted by one or more residues other residues, for example a basic residues such as histidine.

The term "peptide" as used herein means, in general terms, a plurality of amino acid residues joined together by peptide bonds. It is used interchangeably and means the same as polypeptide and protein.

The peptides of the invention generally are synthetic peptides. The peptides may be isolated, purified peptides or variants thereof, which can be synthesised in vitro, for example, by a solid phase peptide synthetic method, by enzyme-catalysed peptide synthesis or with the aid of recombinant DNA technology.

The peptides of the invention can exist in different forms, such as free acids, free bases, esters and other prodrugs, salts and tautomers, for example, and the invention includes all variant forms of the peptides. Thus, the invention encompasses the salt or pro-drug of a peptide. The peptide of the invention may be administered in the form of a pharmaceutically acceptable salt. The invention thus includes pharmaceutically-acceptable salts of the peptide of the invention wherein the parent compound is modified by making acid or base salts thereof for example the conventional non-toxic salts or the quaternary ammonium salts which are formed, e.g., from inorganic or organic acids or bases. Examples of such acid addition salts include acetate, adipate, alginate, aspartate, benzoate, benzenesulfonate, bisulfate, butyrate, citrate, camphorate, camphorsulfonate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, fumarate, glucoheptanoate, glycerophosphate, hemisulfate, heptanoate, hexanoate, hydrochloride, hydrobromide, hydroiodide, 2-hydroxyethanesulfonate, lactate, maleate, malonate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, oxalate, palmoate, pectinate, persulfate, 3-phenylpropionate, picrate, pivalate, propionate, succinate, tartrate, thiocyanate, tosylate, and undecanoate. Base salts include ammonium salts, alkali metal salts such as sodium and potassium salts, alkaline earth metal salts such as calcium and magnesium salts, salts with organic bases such as dicyclohexylamine salts, N-methyl-D- glutamine, and salts with amino acids such as arginine, lysine, and so forth. Also, the basic nitrogen-containing groups may be quaternized with such agents as lower alkyl halides, such as methyl, ethyl, propyl, and butyl chloride, bromides and iodides; dialkyl sulfates like dimethyl, diethyl, dibutyl; and diamyl sulfates, long chain halides such as decyl, lauryl, myristyl and stearyl chlorides, bromides and iodides, aralkyl halides like benzyl and phenethyl bromides and others.

Salts of carboxyl groups of a peptide or peptide variant of the invention may be prepared in the usual manner by contacting the peptide with one or more equivalents of a desired base such as, for example, a metallic hydroxide base, e.g. sodium hydroxide; a metal carbonate or bicarbonate such as, for example, sodium carbonate or bicarbonate; or an amine base such as, for example, triethylamine, triethanolamine and the like.

Administration and Pharmaceutical Formulations A further aspect of the invention provides a pharmaceutical composition comprising a pharmaceutically effective amount of a peptide of the invention. The composition also includes a pharmaceutically acceptable carrier, excipient or diluent. The phrase "pharmaceutically acceptable" is employed herein to refer to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings or, as the case may be, an animal without excessive toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio.

To achieve the desired effect(s), the peptide, a variant thereof or a combination thereof, may be administered as single or divided dosages, for example, of at least about 0.01 mg/kg to about 500 to 750 mg/kg, of at least about 0.01 mg/kg to about 300 to 500 mg/kg, at least about 0.1 mg/kg to about 100 to 300 mg/kg or at least about 1 mg/kg to about 50 to 100 mg/kg of body weight or at least about 1 mg/kg to about 20 mg/kg of body weight, although other dosages may provide beneficial results.

To prepare the composition, peptides are synthesised or otherwise obtained, purified as necessary or desired, and then lyophilised and stabilised. The peptide can then be adjusted to the appropriate concentration and optionally combined with other agents.

Thus, one or more suitable unit dosage forms comprising the therapeutic peptides of the invention can be administered by a variety of routes including oral, topical, parenteral (including subcutaneous, intravenous, intramuscular and intraperitoneal), vaginal, rectal, dermal, transdermal, intrathoracic, intrapulmonary and intranasal (respiratory) routes.

When the therapeutic peptides of the invention are prepared for oral administration, they are generally combined with a pharmaceutically acceptable carrier, diluent or excipient to form a pharmaceutical formulation, or unit dosage form. For oral administration, the peptides may be present as a powder, a granular formation, a solution, a suspension or an emulsion.

Pharmaceutical formulations containing the therapeutic peptides of the invention can be formulated with common excipients, diluents, or carriers, and formed into tablets, capsules, solutions, suspensions, powders, aerosols and the like. The therapeutic peptides of the invention can also be formulated as elixirs or solutions for convenient oral administration or as solutions appropriate for parenteral administration, for instance by intramuscular, subcutaneous, intraperitoneal or intravenous routes.

These formulations can contain pharmaceutically acceptable carriers, vehicles and adjuvants that are well-known in the art. It is possible, for example, to prepare solutions using one or more organic solvent(s) that is/are acceptable from the physiological standpoint, chosen, in addition to water, from solvents such as acetone, acetic acid, ethanol, isopropyl alcohol, dimethyl sulphoxide, glycol ethers such as the products sold under the name "Dowanol", polyglycols and polyethylene glycols, CpC₄ alkyl esters of short-chain acids, ethyl or isopropyl lactate, fatty acid triglycerides such as the products marketed under the name "Miglyol", isopropyl mytrisate, animal, mineral and vegetable oils and polysiloxanes.

Also contemplated are products that include one or more peptides of the present invention in combination with one or more other antifungal agents, for example, polyenes such as amphotericin B, amphotericin B lipid complex (ABCD), liposomal amphotericin B (L- AMB), and liposomal nystatin, azoles and triazoles such as voriconazole, fluconazole, ketoconazole, itraconazole, pozaconazole and the like; glucan synthase inhibitors such as caspofungin, micafungin (FK463), and V-echinocandin (LY303366); griseofulvin; allylamines such as terbinafine; flucytosine or other antifungal agents. In addition, it is contemplated that the peptides might be combined with topical antifungal agents such as ciclopirox olamine, haloprogin, tolnaftate, undecylenate, topical nysatin, amorolfine, butenafine, naftifine, terbinafine, and other topical agents.

For topical administration, the active agents may be formulated as is known in the art for direct application to a target area, for example nails and skin. Forms chiefly conditioned for topical application take the form, for example, of laquers, creams, milks, gels, powders, dispersion or microemulsions, lotions thickened to a greater or lesser extent, impregnated pads, ointments or sticks, aerosol formulations (e.g. sprays or foams), soaps, detergents, lotions or cakes of soap. Other conventional forms for this purpose include wound dressings, coated bandages or other polymer coverings, ointments, creams, lotions, pastes, jellies, sprays, and aerosols. Thus, the therapeutic peptides of the invention can be delivered via patches or bandages for dermal administration.

The peptides of the invention may be administered vaginally for example in the form of a pessary or suppository.

The peptides of the invention can also be administered to the respiratory tract. Thus, the present invention also provides aerosol pharmaceutical formulations and dosage forms for use in the methods of the invention. In general, such dosage forms comprise an amount of at least one of the agents of the invention effective to treat or prevent the clinical symptoms of a specific infection, indication or disease. Any statistically significant attenuation of one or more symptoms of an infection, indication or disease that has been treated pursuant to the method of the present invention is considered to be a treatment of such infection, indication or disease within the scope of the invention.

Use

The peptides of the invention may be useful in the treatment or prevention of fungal infections, including yeast and mould infections.

Thus a further aspect of the invention provides the use of a peptide according to the invention, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for the treatment or alleviation of an infection contributed to or caused by a fungus.

The infection to be treated may be a dermatophyte infection such as an infection caused by a fungus of the genus Trichophyton spp for example Trichophyton rubrum.

Preferably the infection to be treated is a non-dermatophyte infection. The fungal infection may be caused by, but not exclusive to, a fungus selected from the group consisting of Absidia spp, (e.g. Absidia corymbifera), Aspergillus spp, (e.g. Aspergillus candidus, Aspergillus niger, Aspergillus tamarii, Aspergillus flavus, Aspergillus fumigatus, Aspergillus sydowii, Aspergillus terreus, Aspergillus ustus, Aspergillus versicolor, Aspergillus clavatus, Aspergillus glaucus group, Aspergillus nidulans, Aspergillus otyzae,), Cryptococcus spp (e.g. Crytococcus neoformans var. neoformans, Crytococcus neoformans var. gatii, Crytococcus neoformans var. grubiϊ), Malassezia spp (e.g. Malassezia furfur, Malassezia pachydermatis, Malassezia globosa, Malassezia obtuse, Malassezia restricta, Malassezia slooffiae, Malassezia sympodialis), Candida spp (e.g. Candida albicans, Candida tropicalis, Candida glabrata, Candida parapsilosis, Candida krusei, Candida lusitaniae, Candida kefyr, Candida sake, Candida guilliermondii, Candida dubliniensis, Candida ciferii, Candida famata, Candida lambica, Candida lipolytica, Candida norvegensis, Candida rugosa, Candida viswanathii, Candida zeylanoides), Rhizomucor spp, (e.g. Rhizomucor pusillus, Rhizomucor miehei, Rhizomucor variabilis), Saccharomyces spp, (e.g. Saccharomyces cerevisiae, Saccharomyces boullardiϊ), Hansenula spp, Fusarium spp (e.g. Fusarium oxysporum, Fusarium solani, Fusarium chlamydosporum, Fusarium moniliforme, Fusarium proliferatum), Mucor spp (e.g. Mucor amphibiorum, Mucor circinelloides, Mucor hiemalis, Mucor indicus, Mucor racemosus, Mucor ramosissimus), Trichosporon spp (e.g. Trichosporon beigelii, Trichosporon cutaneum, Trichosporon asteroids, Trichosporon ovoides, Trichosporon inikin, Trichosporon asahii, Trichosporon mucoides), Rhodotorula spp, (e.g. Rhodotorula glutinis, Rhodotorula minuta, Rhodotorula mucilaginosa), Pichia spp, (e.g. Pichia anomola, Pichia guilliermondii, Pichia norvegensis, Pichia ohmeriϊ), Rhizopus spp., (e.g. Rhizopus arrhizus, Rhizopus microsporus), Penicillium spp (e.g. Penicillium marneffei, Penicillium verrucosum), Scopulariopsis spp., (e.g. Scopulariopsis brevicaulis) and Blastoschizomyces spp (e.g. Blastoschizomyces capitatus).

The fungus may be an obligate or opportunistic pathogen. Preferably the fungus is an opportunistic pathogen.

In a preferred use according to the invention the fungal infection is caused by a fungus/yeast selected from Aspergillus spp., Fusarium spp., Candida spp., Alternaria spp., Malassezia spp., Scopulariopsis spp. Cryptococcus spp., or Penicillium spp.

In a preferred use according to the invention the fungal infection is caused by a yeast, for example Candida spp. In a preferred use according to the invention the fungal infection is caused by Aspergillus spp. In a preferred embodiment the fungal infection is caused by Aspergillus niger or Aspergillus nidulans.

In a preferred use according to the invention the fungal infection is caused by Fusarium spp.

In a preferred use according to the invention the fungal infection is caused by Alter nana spp.

In a preferred use according to the invention the fungal infection is caused by Malassezia spp.

In a preferred use according to the invention the fungal infection is caused by Penicillium spp.

In a preferred use according to the invention the fungal infection is caused by Scopulariopsis spp.

In a preferred use according to the invention the fungal infection is caused by Cryptococcus spp.

The invention further provides the use of a peptide of the invention, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for the treatment or alleviation of a disease or condition contributed to or caused by a fungal infection.

The disease or condition, herein referred to as a "mycosis", may be a superficial mycosis, a subcutaneous mycosis or a systemic mycosis. Superficial mycoses may include tinea infections (e.g. tinea barbae, tinea capitis, tinea corporis, tinea cruris, tinea favosa, tinea nigra, tinea pedis, tinea manuum, tinea imbricate), pityriasis versicolor, white piedra, black piedra, dermatophytoses (ringworm) and candidiasis of the skin, nails or mucous membranes. Subcutaneous mycoses may include sporotrichosis, chromoblastomycosis and mycetoma.

Preferably the disease or condition to be treated is a systemic mycosis. Examples of systemic mycoses include candidaemia, histoplasmosis, coccidioidomycosis, blastomycosis, paracoccidioidomycosis, aspergillosis, candidiasis, fusariosis, cryptococcosis, phaeohyphomycosis, hyalohyphomycosis, mucormycosis and chromomycosis.

The systemic mycosis is selected from the group consisting of candidaemia, aspergillosis, fusariosis, candidiasis, alternariosis, fungemia and cryptococcosis.

In a preferred aspect of the invention the disease or condition to be treated is an opportunistic systemic mycosis for example a systemic mycosis selected from the group consisting of, but not limited to, candidaemia, aspergillosis, alternariosis, candidiasis, fusariosis, and cryptococcosis.

Clinical diseases or conditions that may be contributed to or caused by mycoses include, but are not limited to, candidaemia, pneumonia, endocarditis, onychomycosis, meningitis, encephalitis, urinary tract infection, mycetoma, pneumothorax, aspergillosis, hyalohyphomycosis, cryptococcosis (meningoencephalitis), versicolor, candidiasis, dermatitis, folliculitis, postulosis (in neonates), blepharitis, white piedra, black piedra, acne vulgaris, septicaemia, peritonitis, thrush, vulvovaginitis, empyema, liver abscess, trichosporonosis, blastomycosis, coccidioidomycosis, histoplasmosis, paracoccidiomycosis, sporotrichosis, zygomycosis, chromoblastomycosis, eye infections, lobomycosis, mycetoma, nail, hair, and skin disease, otomycosis, osteomyelitis phaeohyphomycosis, rhinosporidiosis, mucormycosis.

Major clinical diseases in immunocompromised hosts that are contributed to or caused by systemic mycoses include, but are not limited to, candidaemia, pneumonia, candidiasis (including oropharyngeal and esophageal candidiasis), pulmonary aspergillosis, cerebral infection, rhinosinusitis, pulmonary crytococcosis, meningitis, rhinocerebral mucormycosis and pulmonary mucormycosis. Disease or conditions that are contributed to or caused by an infection by aspergillus spp. include aspergillosis, otomycosis, osteomyelitis, sinus disease, pulmonary disease and nasoorbital infections. Aspergillus spp. primarily affects immunocompromised hosts such as leukemia or transplant (e.g. bone marrow) patients.

Disease or conditions that are contributed to or caused by an infection by fusarium spp. include keratitis, endophthalmitis, otitis media, onychomycosis, cutaneous infections (in particular burn wounds), mycetoma, sinusitis, pulmonary infections, endocarditis, peritonitis, venous catheter infections, septic arthritis, disseminated infections and fungemia.

Disease or conditions that are contributed to or caused by an infection by alternaria spp. include bronchial asthma and alternariosis of the skin or lung.

Disease or conditions that are contributed to or caused by an infection by Cryptococcus spp., for example Cryptococcus neoformans, include wound or cutaneous cryptococcosis, pulmonary cryptococcosis or cryptococcal meningitis.

The diseases or disorders to be treated may be nosocomial disorders.

In one embodiment the invention provides the use of a peptide of formula (I) wherein n is an integer between 11 and 15 (in particular between 11 and 13), or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for the treatment of opportunistic systemic mycoses.

The peptides of the invention are useful in the treatment of yeast and mould infections in immunocompromised and non-immunocompromised patients. The majority of yeasts and moulds are pathogenic in immunocompromised patients, for example, patients compromised by HIV infection, cancer chemotherapy, indwelling surgical devices (e.g. catheters), ionizing irradiation, corticosteroids, immunosuppressives for example in organ or bone marrow transplantation, invasive surgical techniques, prolonged exposure to antibiotics, or by diseases or conditions such as cancer, leukemia, emphysema, bronchiectasis, diabetes mellitus, burns, and the like. Yeast and mould infections that are pathogenic in immunocompromised patients include fungaemia (of the bloodstream lungs, kidneys, liver, spleen, brain and endocardium), candidaemia, candidiasis, pneumonia, ostoemyelitis, discitis, cryptococcosis (pulmonary, skin, prostate and medullary cavity), catheter related infections, mycoses including meningitis, septicaemia and peritonitis, sepsis, white piedra and trichosporonosis.

Fungal infections according to the invention may be local or systemic infections. Local infections caused by Candida spp include thrush e.g. oral thrush, oesophagitis, cutaneous candidiasis, vaginal thrush. Such local infections may be treatable by formulations such as tablets, creams, ointments, suppositories comprising a peptide, or pharmaceutically acceptable salt thereof, of the invention.

Yeast and mould infections treatable by the peptides of the present invention may be selected from any of the infections, and their causative pathogens, shown in Table 2.

A further aspect of the invention provides a method for the treatment, prevention or delay of progression of a mycosis which comprises administering to a patient a therapeutically effective amount of a peptide according to the invention, or a pharmaceutically acceptable salt thereof.

Preferably the patient is a mammal, in particular human.

The mycoses treatable by a method of the invention may be a systemic mycoses for example an opportunistic systemic mycoses. In a preferred method of the invention, the peptide, or pharmaceutically acceptable salt thereof, is intended as a formulation intended for inhalation, oral or parenteral administration.

Thus in one embodiment the invention provides a method for the treatment, prevention or delay of progression of a mycosis which comprises administering to a patient a therapeutically effective amount of an aerosol formulation comprising a peptide according to the invention, or a pharmaceutically acceptable salt thereof. The invention further provides an aerosol formulation, including an inhaler comprising said aerosol formulation, comprising a peptide according to the invention, or a pharmaceutically acceptable salt thereof.

In a further embodiment the invention provides a method for the treatment, prevention or delay of progression of a mycosis which comprises administering to a patient a therapeutically effective amount of a parenteral formulation comprising a peptide according to the invention, or a pharmaceutically acceptable salt thereof. The invention further provides a parenteral formulation (in particular intravenous) comprising a peptide according to the invention, or a pharmaceutically acceptable salt thereof.

In a yet further embodiment the invention provides a method for the treatment, prevention or delay of progression of a mycosis which comprises administering to a patient a therapeutically effective amount of an oral formulation comprising a peptide according to the invention, or a pharmaceutically acceptable salt thereof. The invention further provides an oral formulation comprising a peptide according to the invention, or a pharmaceutically acceptable salt thereof.

The diagnosis of specific diseases or conditions treatable according to the invention can be readily determined by the skilled person by the isolation of the causative fungus from blood, tissue, urine etc followed by assaying the fungicidal/fungistatic effect of the peptide.

The extent of protection includes counterfeit or fraudulent products which contain or purport to contain a compound of the invention irrespective of whether they do in fact contain such a compound and irrespective of whether any such compound is contained in a therapeutically effective amount.

Features, integers, characteristics, compounds, chemical moieties or groups described in conjunction with a particular aspect, embodiment or example of the invention are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith.

The following Example illustrates the invention. EXAMPLE Materials and Methods Peptide Synthesis

All peptides were produced either by solid-phase synthesis under contract by a peptide supplier, NeoMPS SA (Strasbourg, France), or purchased from Sigma-Aldrich Chemical Company Ltd. (Poole, UK).

Broth Dilution Antifungal Susceptibility Testing

The sensitivity of relevant fungal strains to the peptides was determined using Clinical Laboratory Standard Institute (CLSI; formerly NCCLS) Approved Standards. Fungal susceptibility was tested using "Reference Method for Broth Dilution Antifungal Susceptibility Testing of Filamentous Fungi; Approved Standard M38-P", and yeast susceptibility was tested using "Reference Method for Broth Dilution Antifungal Susceptibility Testing of Yeasts; Approved Standard - Second Edition M27-A".

Results

Sequence of Cationic Peptides

The sequence of the peptides analysed is shown in Table 1. Ac represents an Acetylated modification to the C-terminus of the oligopeptide and NH₂ represents an amidation of the N-terminus of the oligopeptide.

Table 1 Candida spp. Type Strains MIC Data table (μM)

Peptide Amino Acid Sequence

NP101 Poly-L-Lysine (MW 15-3O kDa)

NP108 Poly-L-Lysine (MW 10-2O kDa)

NP112 Poly-L-Lysine (MW 0.5-2 kDa)

NP121 Poly-L-Arginine (MW 5-15 kDa)

NP213 cyclo-KKKKKKK

NP301 RVRVR

NP302 RRWR

NP303 RRVRR

NP304 RRVRVR

NP305 RRWRR

NP306 RRRVRRR

NP307 RRVRVRR

NP308 RRRWRRR NP309 RRVRRVRR NP310 RRRRWRRRR NP311 RRWRRWRR NP316 RRRRRRRRR NP317 RRRRRRRRRRR NP318 RRRRRRRRRRRRR NP319 RRRRRRRRRRRRRRR NP320 RWRWR NP321 RRWWR NP322 RRWRR NP323 RRWRWR NP324 RRWWRR NP325 RRRWRRR NP326 RRWRWRR NP327 RRRWWRRR NP328 RRWRRWRR NP329 RRRRWWRRRR NP330 RRWWRRWWRR NP331 GKKEKPEKKVKK NP332 KLTKPKPQAESKKKKK NP333 KKKKKEGKKQEKMLD NP334 KKKDKVKK NP335 KVRQGTLKKAR NP336 PKTKAKAKAKKGKGKD NP337 RRRRRRRRRRRRR NP338 AC-RRRRRRRRRRRRR-NH₂ NP339 dRdRdRdRdRdRdRdRdRdRdRdRdR NP340 AOdRdRdRdRdRdRdRdRdR dRdRdRdR-NH₂ NP341 dRdRdRdRdRdRdRdRdRdRdRdRdR-CONH NP342 KKK NP343 KKKKK NP344 KKKKKKK NP345 KKKKKKKKK NP346 KKKKKKKKKKK NP347 KKKKKKKKKKKKK NP348 KKKKKKKKKKKKKKK NP349 RRRRRRRRR NP350 RRRRRRRRRRR NP351 RRRRRRRRRRRRR NP352 RRRRRRRRRRRRRRR NP353 dRdFdWdWdFdRdRdR-CONH₂ NP354 ILRWPWWPWRRK-CONH₂ NP355 dAdKdRdHdHdGdYdKdRdKdFdH-CONH₂ NP356 RRR NP357 RRRRR NP358 RRRRRRR NP359 dHdHdH NP360 dHdHdHdHdH NP361 dHdHdHdHdHdHdH NP362 dHdHdHdHdHdHdHdHdH NP363 UHdHdHdHdHdHdHdHdHdHdH NP364 dHdHdHdHdHdHdHdHdHdHdHdHdH NP365 dHdHdHdHdHdHdHdHdHdHdHdHdHdHdH

Data showing the activity of the peptides against various fungal, including yeast, strains is shown in Table 2.

Table 2 Yeast MIC Data

Genus & Species Strain Peptide MIC (μM)

C. albicans ATCC24433 NP323 1024

C. albicans ATCC24433 NP324 1024

C. albicans ATCC24433 NP326 1024

C. albicans ATCC24433 NP327 1024

C. albicans ATCC24433 NP328 2048

C. albicans ATCC24433 NP329 1024

C. albicans ATCC24433 NP337 4

C. albicans ATCC24433 NP338 2

C. albicans ATCC24433 NP340 8

C. albicans NCTC3179 NP342 >2048

C. albicans NCTC3179 NP344 >2048

C. albicans NCTC3179 NP343 >2048

C. albicans NCTC3179 NP344 >2048

C. albicans NCTC3179 NP345 >2048

C. albicans NCTC3179 NP346 >2048

C. albicans NCTC3179 NP347 >2048

C. albicans NCTC3179 NP348 >2048

C. albicans NCTC3179 NP349 2048

C. albicans NCTC3179 NP350 64

C. albicans NCTC3179 NP351 4

C. albicans NCTC3179 NP352 4

C. albicans NCTC3179 NP356 >2048

C. albicans NCTC3179 NP357 >2048

C. albicans NCTC3179 NP358 >2048

C. albicans ATCC90028 NP323 2048

C. albicans ATCC90028 NP324 1024

C. albicans ATCC90028 NP326 1024 C. albicans ATCC90028 NP327 256 C. albicans ATCC90028 NP328 1024 C. albicans ATCC90028 NP337 4 C. albicans ATCC90028 NP338 4 C. albicans ATCC90028 NP340 2 C. albicans 73/034 NP337 512 C. albicans 73/034 NP338 256 C. albicans 73/034 NP340 2 C. albicans AM2003-020 NP337 4 C. albicans AM2003-020 NP338 4 C. albicans AM2003-020 NP340 2 C. albicans AM2003-0069 NP337 16 C. albicans AM2003-0069 NP338 16 C. albicans AM2003-0069 NP340 2 C. albicans AM2003-0100 NP337 16 C. albicans AM2003-0100 NP338 16 C. albicans AM2003-0100 NP340 2 C. albicans AM2003-0182 NP337 256 C. albicans AM2003-0182 NP338 32 C. albicans AM2003-0182 NP340 4 C. albicans AM2003-0191 NP337 2 C. albicans AM2003-0191 NP338 1 C. albicans AM2003-0191 NP340 4 C. albicans AM2004-0025 NP337 2 C. albicans AM2004-0025 NP338 1 C. albicans AM2004-0025 NP340 4 C. albicans AM2005-0377 NP337 64 C. albicans AM2005-0377 NP338 128 C. albicans AM2005-0377 NP340 2 C. albicans HUN68 NP337 4 C. albicans HUN68 NP338 1 C. albicans HUN68 NP340 4 C. albicans IHEM3742 NP337 128 C. albicans IHEM3742 NP338 4 C. albicans IHEM3742 NP340 2 C. albicans IHEM16614 NP337 64 C. albicans IHEM16614 NP338 16 C. albicans IHEM16614 NP340 2 C. albicans I H EM 16945 NP337 128 C. albicans I H EM 16945 NP338 16 C. albicans I H EM 16945 NP340 4 C. albicans I H EM 16972 NP337 32 C. albicans I H EM 16972 NP338 8 C. albicans I H EM 16972 NP340 2 C. albicans L1086 NP337 2 C. albicans L1086 NP338 2 C. albicans L1086 NP340 2 C. albicans RV4688 NP337 512 C. albicans RV4688 NP338 16 C. albicans RV4688 NP340 512 C. albicans S20122.073 NP337 2 C. albicans S20122.073 NP338 2 C. albicans s20122.073 NP340 2 C. albicans S20152.013 NP337 256 C. albicans S20152.013 NP338 32

C. albicans S20152.013 NP340 4

C. albicans S20152.082 NP337 128

C. albicans S20152.082 NP338 16

C. albicans S20152.082 NP340 4

C. albicans S20175.016 NP337 512

C. albicans S20175.016 NP338 128

C. albicans S20175.016 NP340 0.5

C. albicans S20176.079 NP337 128

C. albicans S20176.079 NP338 32

C. albicans S20176.079 NP340 2

C. krusei NCPF3953 NP316 32

C. krusei NCPF3953 NP317 32

C. krusei NCPF3953 NP318 8

C. krusei NCPF3953 NP319 <16

C. krusei NCPF3953 NP323 256

C. krusei NCPF3953 NP324 256

C. krusei NCPF3953 NP326 128

C. krusei NCPF3953 NP328 128

C. krusei NCPF3953 NP329 32

C. krusei NCPF3953 NP337 16

C. krusei NCPF3953 NP338 8

C. krusei NCPF3953 NP349 8

C. krusei NCPF3953 NP350 8

C. krusei NCPF3953 NP351 32

C. krusei NCPF3953 NP352 32

C. krusei NCPF3953 NP354 >2048

C. krusei ATCC6258 NP316 <16

C. krusei ATCC6258 NP317 <16

C. krusei ATCC6258 NP318 <16

C. krusei ATCC6258 NP337 2

C. krusei ATCC6258 NP338 2

C. krusei ATCC6258 NP340 4

C. parapsilosis ATCC22019 NP317 256

C. parapsilosis ATCC22019 NP318 256

C. parapsilosis ATCC22019 NP337 32

C. parapsilosis ATCC22019 NP338 8

C. parapsilosis ATCC22019 NP340 2

C. parapsilosis ATCC90018 NP317 256

C. parapsilosis ATCC90018 NP337 128

C. parapsilosis ATCC90018 NP338 128

C. parapsilosis ATCC90018 NP340 2

C. tropicalis ATCC750 NP337 2

C. tropicalis ATCC750 NP338 2

C. tropicalis ATCC750 NP340 2

NP339 Yeast MIC Data

Genus & Species Strain MIC (μM)

C. albicans ATCC24433 2 C. albicans ATCC90028 2 C. albicans NCTC3179 2 C. albicans 73/034 1 C. albicans AM2003-020 2 C. albicans AM2003-0191 1 C. albicans AM2003-0069 2 C. albicans AM2003-0100 2 C. albicans AM2003-0182 2 C. albicans AM2004-0025 1 C. albicans AM2005-0377 2 C. albicans HUN68 2 C. albicans IHEM3742 2 C. albicans IHEM16614 1 C. albicans IHEM16945 4 C. albicans IHEM16972 1 C. albicans L1086 2 C. albicans RV4688 2 C. albicans S20122.073 2 C. albicans S20152.013 2 C. albicans s20152.082 4 C. albicans S20175.016 2 C. albicans s20176.079 8 C. albicans SC5314 2 C. glabrata AM2002/0085 2 C. glabrata AM2002/0088 1 C. glabrata AM2007/0113 2 C. glabrata AM2007/0114 1 C. glabrata AM2007/0115 2 C. glabrata AM2007/0116 1 C. glabrata AM2007/0117 1 C. glabrata AM2007/0118 2 C. glabrata AM2007/0119 1 C. glabrata AM2007/0120 2 C. glabrata AM2007/0121 1 C. glabrata AM2007/0122 1 C. glabrata AM2007/0123 1 C. glabrata AM2007/0124 1 C. glabrata AM2007/0125 2 C. glabrata AM2007/0126 1 C. glabrata AM2007/0127 1 C. glabrata AM2007/0128 1 C. glabrata AM2007/0129 1 C. glabrata AM2007/0130 1

NP339 Yeast MIC Data

Genus & Species Strain MIC (μM)

C. /cruse/ ATCC6258 2 C. krusei AM2007/0102 2 C. krusei AM2007/0103 2 C. krusei AM2007/0104 1 C. krusei AM2007/0105 1 C. krusei AM2007/0106 1 C. krusei AM2007/0107 1 C. krusei AM2007/0109 1 C. krusei AM30274.04 2 C. krusei AM30308.03.05 1 C. /cruse/ AM30332.04.05 2

C. /cruse/ AM30455.04.05 1

C. /cruse/ AM2005/0492 1

C. /cruse/ AM2005/0494 1

C. /cruse/ AM2005/0496 2

C. /cruse/ AM2005/0498 1

C. /cruse/ AM2005/0525 2

C. /cruse/ AM2005/0531 2

C. /cruse/ AM2006/0127 1

C. /cruse/ AM31194/04/05 2

C. /cruse/ AM31300/04/05 2

C. parapsilosis ATCC90018 2

C. parapsilosis ATCC22019 1-2

C. parapsilosis AM2004/0133 1-2

C. parapsilosis AM2005-0112 2

C. parapsilosis AM2005/0233 8

C. parapsilosis AM2005/0237 1

C. parapsilosis AM2005/0238 16

C. parapsilosis AM2005/0239 1

C. parapsilosis AM2005/0242 4

C. parapsilosis AM2005/0337 2-16

C. parapsilosis AM2007/0131 4-32

C. parapsilosis AM2007/0132 16-32

C. parapsilosis AM2007/0134 4-32

C. parapsilosis AM2007/0135 1-2

C. parapsilosis AM2007/0136 2

C. parapsilosis AM2007/0137 8-32

C. parapsilosis AM2007/0138 16-32

C. parapsilosis AM2007/0139 8

: Data

Genus & Species Strain MIC (μM)

C. tropicalis ATCC750 2 C. tropicalis AM2004/0087 1 C. tropicalis AM2004/0088 1 C. tropicalis AM2004/0089 1 C. tropicalis AM2004/0090 1 C. tropicalis AM2004/0091 1

Cryptococcus neoformans DSM 11959

NP341 Yeast MIC Data

Genus & Species Strain MIC (μM)

C. albicans ATCC24433 2 C. albicans ATCC90028 1 C. albicans NCTC3179 2 C. albicans S20176.079 32 C. albicans AM2007/0069 2 C. albicans IHEM3743 8 C. albicans I H EM 16945 32 C. albicans SC5314 2 C. glabrata NCPF3943 4 C. glabrata NCPF3831 1 C. glabrata AM2002/0085 2 C. glabrata AM2002/0088 1

C. glabrata AM2007/0113 1

C. glabrata AM2007/0114 1

C. glabrata AM2007/0115 1

C. glabrata AM2007/0116 2

C. glabrata AM2007/0117 2

C. glabrata AM2007/0118 2

C. glabrata AM2007/0119 1

C. glabrata AM2007/0120 1

C. glabrata AM2007/0121 1

C. glabrata AM20070122 1

C. glabrata AM2007/0125 1

C. glabrata AM2007/0126 1

C. glabrata AM2007/0127 1

C. glabrata AM20070128 1

C. glabrata AM2007/0129 1

C. glabrata AM2007/0130 2

C. krusei ATCC6258 1

C. krusei NCPF3953 1

C. krusei AM30308/03/05 2

C. krusei AM2007/0106 2

C. krusei AM2007/0105 2

C. krusei AM30308/03/058 2

C. krusei AM2005/0492 1

C. krusei AM2005/0494 1

C. krusei AM2005/0496 1

C. krusei AM2005/0498 2

C. krusei AM2005/0525 2

C. krusei AM2005/0531 1

C. krusei AM2006/0127 2

C. krusei AM31194/04/05 1

C. krusei AM31300/04/05 2

C. parapsilosis ATCC90018 2

C. parapsilosis ATCC22019 1

C. parapsilosis AM2005/0358 4

C. parapsilosis AM2005/0225 4-32

C. parapsilosis AM2007/0135 2

C. parapsilosis AM2007/0137 8

C. parapsilosis AM2005-0112 2

C. tropicalis ATCC750 1

C. tropicalis AM2005/0087 1

C. tropicalis AM2004/0088 1

C. tropicalis AM2005/0089 1

C. tropicalis AM2005/00110 1

C. tropicalis AM2005/00111 2

Cryptococcus neoformans DSM 11959 1

NP339 Aspergillus spp. MIC Data

Genus & Species Strain MIC (μM)

A nidulans NCPF2691 3.9

A nidulans AFG97-71 4000

A. nidulans AFG97-453 62.5

A. nidulans AFG 98-281 62.5

A. nidulans AFG9811-35 125

A nidulans AFG99-247 256 A nidulans AFG99-1373 62.5

A. nidulans AFG99-2387 62.5

A. nidulans AFGOO-676 1000

A. nidulans AFG01-835 1000

A. nidulans AFG01-1716 62.5

A. nidulans AFGR2952 62.5

A. niger NCPF2022 7.8

A. niger AFG 01-2620 >4000

A. niger AFG 01-2840 62.5

A. niger AFG 01-783 62.5

A. niger AFG 01-237 1000

A. niger AFG 01-385 1000

A. niger AFG 01-1494 62.5

A. niger AFG 01-2103 62.5

A. niger AFG 01-60 62.5

A. niger AFG 01-1286 62.5

A. niger AFG 01-423 62.5

A. niger AFG 01-1237 62.5

A. niger AFG 01-2267 62.5

A. niger AFG 01-381 62.5

A. niger AFG 01-2112 62.5

A. niger AFG 01-809 62.5

A. niger AFG 01-1424 62.5

A. niger AFG J970467 62.5

A. niger AFG J940179 62.5

NP341 Aspergillus spp. MIC Data

Genus & Species Strain MIC (μM)

A nidulans AFG97-71 4000

A nidulans AFG99-242 62.5 A. nidulans AFG01-1716 62.5 A. nidulans AFG00676 512 A. nidulans AGFR2952 62.5 A. nidulans AFG01-835 512 A. nidulans AFG97-453 62.5 A. nidulans AFG99-1373 >4000 A. nidulans AFG99-2387 256 A. nidulans AFG9811-35 2048 A. nidulans AFG 01-835 1024 A. nidulans AFG 01-1716 62.5 A. nidulans AFG 99-2387 62.5 A. nidulans AFG 98-281 62.5 A. niger AFG 01-2620 >4000 A. niger AFG 01-2840 62.5 A. niger AFG 01-783 62.5 A. niger AFG 01-237 62.5 A. niger AFG 01-385 62.5 A. niger AFG 01-1494 62.5 A. niger AFG 01-2103 62.5 A. niger AFG 01-60 62.5 A. niger AFG 01-1286 62.5 A. niger AFG 01-423 62.5 A. niger AFG 01-1237 62.5 A. niger AFG 01-2267 62.5 A. niger AFG 01-381 62.5 A. niger AFG 01-2112 62.5 A. niger AFG 01-809 62.5 A. niger AFG 01-1424 62.5 A. niger AFG J970467 62.5 A. niger AFG J940179 62.5

Other Fungi and Yeasts MIC Data

Genus & Species Strain Peptide MIC (μM)

Alternaria spp. DM 2006 1218a NP108 62.5 (μg/ml)

Alternaria spp. DM 2006 1218a NP121 13.2 (μg/ml)

Alternaria spp. DM 2006 1218a NP339 7.8

Fusarium solani NCPF2877 NP108 256 (μg/ml)

Fusarium solani NCPF2877 NP121 7.8 (μg/ml)

Fusarium solani NCPF2877 NP339 3.9

Fusarium spp. DM 2006 1133 NP108 125 (μg/ml)

Fusarium spp. DM 2006 1133 NP121 156 (μg/ml)

Fusarium spp. DM 2006 1133 NP339 125

Malasezzia furfur DSM6170 NP316 125

Malasezzia furfur DSM6170 NP317 <15.6

Malasezzia furfur DSM6170 NP318 62.5

Malasezzia furfur DSM6170 NP319 256

Malasezzia furfur DSM6170 NP337 31.25

Malasezzia furfur DSM6170 NP338 <15.6

Malasezzia furfur DSM6170 NP112 512 (μg/ml)

Penicillium spp. DM 2006 1285b NP108 31.2 (μg/ml) Penicillium spp. DM 2006 1285b NP121 15.6 (μg/ml)

Penicillium spp. DM 2006 1285b NP339 15.6

Scopulariopsis brevicaulis DM 2006 1025 NP108 3.9 (μg/ml)

Scopulariopsis brevicaulis DM 2006 1025 NP121 3.9 (μg/ml)

Scopulariopsis brevicaulis DM 2006 1025 NP339 1

Trichophyton rubrum NCPF118 NP301 >2

Trichophyton rubrum NCPF118 NP302 >2

Trichophyton rubrum NCPF118 NP303 >2

Trichophyton rubrum NCPF118 NP304 >2

Trichophyton rubrum NCPF118 NP305 >2

Trichophyton rubrum NCPF118 NP306 >2

Trichophyton rubrum NCPF118 NP307 >2

Trichophyton rubrum NCPF118 NP308 >2

Trichophyton rubrum NCPF118 NP309 >2

Trichophyton rubrum NCPF118 NP310 >2

Trichophyton rubrum NCPF118 NP316 0.5

Trichophyton rubrum NCPF118 NP317 0.25

Trichophyton rubrum NCPF118 NP318 >2

Trichophyton rubrum NCPF118 NP319 >2

Candida spp. Type Strains MIC Data table (μM)

, .. . Candida albicans Candida albicans Candida albicans Candida krusei

>ept.de NCTC3179 ATCC24433 ATCC90028 NCPF3953

NP301 >2000 ND ND ND

NP302 >2000 ND ND ND

NP303 >2000 ND ND ND

NP304 >2000 ND ND ND

NP305 >2000 ND ND ND

NP306 >2000 ND ND ND

NP307 >2000 ND ' ND ND

NP308 >2000 ND ND ND

NP309 >2000 ND ND ND

NP310 >2000 ND ND ND

NP311 >2000 ND ND ND

NP316 >2000 ND ND 8

NP317 512 ND ND 32

NP318 4 ND ND 8

NP319 4 ND ND 8

NP320 >2000 ND ND ND

NP321 >2000 ND ND ND

NP322 >2000 ND ND ND

NP323 1024 1024 2000 256

NP324 1024 1024 1024 256

NP325 >2000 ND ND ND

NP326 2000 1024 1024 128

NP327 512 1024 512 64 NP328 1024 1024 1024 128

NP329 256 512 ND 32

NP331 >2000 ND ND ND

NP332 >2000 ND ND ND

NP333 >2000 ND ND ND

NP334 >2000 ND ND ND

NP335 >2000 ND ND ND

NP336 >2000 ND ND ND

NP337 2 2 4 16

NP338 2 2 4 8

NP339 ND ND 2 ND

NP340 ND ND 2 ND

Certain Aspergillus spp strains including Aspergillus terreus, Aspergillus fumigatus and Aspergillus flavus were found to be insensitive to those peptides tested (data not shown).

Claims

1. A peptide for use as an antifungal agent wherein the peptide comprises a sequence of 5 to 15 basic amino acids wherein substantially all of the amino acids in said sequence are the same.

2. A peptide as claimed in claim 1 wherein the basic amino acids are selected from the group consisting of lysine, arginine and histidine.

3. A peptide as claimed in claim 2 wherein the basic amino is arginine or lysine.

4. A peptide as claimed in any preceding claim wherein the peptide comprises an amino acid sequence according to the formula (I)

(X)_n (I)

wherein X is each of arginine or lysine and n is an integer between 5 and 15.

5. A peptide as claimed in claim 4 wherein n is between 9 and 15.

6. A peptide as claimed in claim 5 wherein n is between 11 and 14.

7. A peptide as claimed in claim 6 wherein n is between 12 and 14.

8. A peptide as claimed in claim 7 wherein n is selected from 13 and 14.

9. A peptide as claimed in claim 5 wherein n is between 9 and 13.

10. A peptide as claimed in claim 9 wherein n is between 9 and 11.

11. A peptide as claimed in claim 5 wherein n is 13.

12. A peptide as claimed in any one of claims 5 to 11 wherein X is arginine.

13. A pharmaceutical composition comprising a peptide as claimed in any preceding claim, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier, diluent or excipient.

14. Use of a peptide, or pharmaceutically acceptable salt thereof, in the manufacture of a medicament for the treatment or alleviation of an infection contributed to or caused by a fungus wherein the peptide comprises a sequence of 5 to 15 basic amino acids and wherein substantially all of the amino acids in said sequence of amino acids are the same.

15. Use as claimed in claim 14 wherein the infection to be treated is a dermatophyte infection.

16. Use as claimed in claim 14 wherein the infection to be treated is a non- dermatophyte infection.

17. Use as claimed in claim 16 wherein the non-dermatophyte infection is contributed to or caused by a fungus selected from the group consisting of Absidia spp., Aspergillus spp., Cryptococcus spp., Malassezia spp., Candida spp., Rhizomucor spp., Saccharomyces spp., Hansenula spp, Fusarium spp., Mucor spp., Trichosporon spp., Rhodotorula spp., Pichia spp., Rhizopus spp., Penicillium spp., and Blastoschizomyces spp.

18. Use as claimed in claim 17 wherein the fungus is selected from the group consisting of Aspergillus spp., Fusarium spp., Candida spp., Alternaria spp., Pencillium spp., Scopulariopsis spp., Malassezia spp. and Cryptococcus spp.

19. Use as claimed in claim 18 wherein the fungus is Candida spp.

20. Use as claimed in claim 18 wherein the fungus is Aspergillus spp.

21. Use as claimed in any one of claims 14 to 20 wherein the fungus is an opportunistic pathogen.

22. Use of a peptide, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for the treatment or alleviation of a disease or condition contributed to or caused by a fungal infection.

23. Use as claimed in claim 22 wherein the fungal infection is a yeast infection.

24. Use as claimed in claim 22 or 23 wherein the disease or condition to be treated is a systemic mycosis.

25. Use as claimed in claim 24 wherein the systemic mycosis is selected from the group consisting of histoplasmosis, coccidioidomycosis, blastomycosis, paracoccidioidomycosis, aspergillosis, candidiasis, fusariosis, cryptococcosis, phaeohyphomycosis, hyalohyphomycosis, aspergillosis, fungemia, mucormycosis, alternariosis, trichosporonosis and chromomycosis.

26. Use as claimed in claim 25 wherein the systemic mycosis is selected from the group consisting of aspergillosis, fusariosis, candidiasis, alternariosis, fungemia and cryptococcosis.

27. Use as claimed in claim 24 wherein the systemic mycosis is an opportunistic mycosis.

28. Use as claimed in claim 27 wherein the opportunistic mycosis is selected from the group consisting of aspergillosis, alternariosis, candidiasis, fusariosis, and cryptococcosis.

29. Use as claim in claim 27 wherein the disease or condition is selected from pneumonia, oropharyngeal and esophageal candidiasis, pulmonary aspergillosis, cerebral infection, rhinosinusitis, pulmonary crytococcosis, meningitis, rhinocerebral mucormycosis and pulmonary mucormycosis.

30. Use as claimed in any one of claims 27 to 29 wherein the disease or condition is a nosocomial disorder.

31. A method for the treatment, prevention or delay of progression of a mycosis which comprises administering to a patient a therapeutically effective amount of a peptide according to the invention, or a pharmaceutically acceptable salt thereof.

32. A method as claimed in claim 31 wherein the peptide, or pharmaceutically acceptable salt thereof, is formulated for inhalation.

33. A method as claimed in claim 31 wherein the peptide, or pharmaceutically acceptable salt thereof, is formulated for parenteral administration.