CN1147836A - 制备脂解酶变异体的方法 - Google Patents
制备脂解酶变异体的方法 Download PDFInfo
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- CN1147836A CN1147836A CN95192164A CN95192164A CN1147836A CN 1147836 A CN1147836 A CN 1147836A CN 95192164 A CN95192164 A CN 95192164A CN 95192164 A CN95192164 A CN 95192164A CN 1147836 A CN1147836 A CN 1147836A
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- lipolytic enzyme
- lipase
- enzyme
- dna sequence
- dna
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Abstract
制备脂解酶变异体的方法,所述方法包括(a)随机诱变编码亲本脂解酶的DNA序列,(b)在宿主细胞中表达步骤(a)中得到的突变DNA序列,和(c)筛选表达突变的脂解酶的宿主细胞,所述突变的脂解酶与亲本脂解酶相比:对钙的依赖性降低和/或对洗涤剂或洗涤剂组分的耐受性改善。
Description
本发明领域
本发明涉及制备亲本脂解酶的变异体的方法和用所述方法制备的变异体。此外,本发明还涉及编码本发明变异体的DNA构建体,含所述DNA构建体的表达载体和宿主细胞以及含变异体的洗涤剂添加剂或洗涤剂组合物。本发明的背景
用脂解酶作为洗涤剂酶,即从衣服和其他织物上除去脂或油斑已经有许多年了。
例如已经用各种微生物脂酶作为洗涤剂酶。所述脂酶的实例包括Humicola lanuginosa脂酶,如在EP258068和EP 305216中描述的,Rhizomucor miehei脂酶,如在EP 238023中描述的,假丝酵母脂酶,如C.antarctica脂酶,如在EP 214 761中描述的C.antarctica脂酶A或B,假单胞菌脂酶,如P.alcaligenes和类产碱假单胞菌脂酶,如在EP 218 272中描述的,葱头假单胞菌脂酶,如在EP 331376中描述的,芽孢杆菌脂酶,如枯草芽孢杆菌脂酶(Dartois et al.,1993),嗜热脂肪芽孢杆菌脂酶(JP64/744992)和短小芽孢杆菌脂酶(EP 9100664)。
此外,已经描述了大量克隆的脂酶,包括由Yamaguchi,S.等人(1991)描述的沙门氏柏干酪青霉脂酶,白地霉脂酶(Schimada,Y,etal.,1989),和各种根霉属脂酶如德列马根霉脂酶(Hass,M.J.et al,1991),雪白根霉脂酶(Kugimiya,W.1992)和米根霉脂酶。
已用来作为洗涤剂酶的其他类型的脂解酶包括角质酶,如在WO88/09367中描述的得自多茜娜假单胞菌的,或得自Fusarium solani pisi的角质酶(如在WO90/09446中描述的)。
近年来,试图制备用于洗涤剂目的的具有改善的特性的脂酶变异体。如WO92/05249描述了具有改善的特性的脂酶变异体,其中通过特异性的,即定点修饰其氨基酸序列而改变了野生型脂酶的特定特征。更具体地说,描述了脂酶变异体,其中修饰了亲本脂酶所谓脂接触区的一个或多个氨基酸残基。
PCT/DK93/00225描述了具有改善的特性的脂酶变异体,其中修饰了占据脂酶重要位置的氨基酸残基。
EP 407 225公开了具有改善的抗蛋白水解酶的脂酶变异体,这是通过特定氨基酸修饰而制备的。
EP 260105描述了水解酶,其中取代了距离活性位点15埃内的氨基酸残基。
所有上述脂酶变异体都是通过导致特异性氨基酸残基修饰的定点诱变而构建的,特异性氨基酸残基的选择是在其类型或其在亲本脂酶二级或三级结构中的位置的基础上进行的。
构建给定蛋白质的突变体或变异体的另一种方法是以随机诱变为基础。例如在US4898331和WO93/01285公开了所述技术。
需要具有改善的洗涤和/或餐具洗涤特性的新脂解酶,而本发明的目的就是制备所述酶。本发明的概述
本发明人研制了一种制备脂解酶变异体的新方法,所述脂解酶与其亲本酶相比具有改善的洗涤和/或餐具洗涤特性。所述方法是以随机或定位随机诱变编码脂解酶的DNA序列为基础的。
更具体地说,在本发明的第一方面涉及制备亲本脂解酶的变异体的方法,所述方法包括
(a) 随机诱变编码亲本脂解酶的DNA序列,
(b) 在宿主细胞中表达步骤(a)中得到的突变的DNA序列,和
(c) 筛选表达突变的脂解酶的宿主细胞,所述突变的脂解酶与亲本脂解酶相比对钙的依赖性降低和/或对洗涤剂或一种或多种洗涤剂组分的耐受性提高。
在本发明说明书中,术语“脂解酶”指表现出脂降解能力,如降解甘油三酯或磷脂能力的酶。所述脂解酶可以是例如脂酶,磷脂酶,酯酶或角质酶。
术语“随机诱变”指在常规方法中是可以被理解的,即指在亲本酶的随机位置导入一个或多个突变(即与定点诱变相反)。通常通过将大量需要修饰的DNA序列拷贝暴露于诱变剂,然后筛选变异体的存在。下文将详细描述导入随机突变的技术。
认为步骤c)的筛选标准在鉴定与其亲本酶相比具有改善的洗涤和/或餐具洗涤性能的亲本脂解酶的变异体时是特别有用的。
在本发明说明书中,术语“对钙的依赖性降低”指当在相似条件下检测时,突变脂解酶在表现出与亲本酶相同的活性所需的钙量较低。优选的,本发明突变脂解酶在表现酶活性时基本上不需要钙的存在。
术语“改善的对洗涤剂或洗涤剂组分的耐受性”指突变的脂解酶在较高浓度的洗涤剂或洗涤组分时,与亲本脂解酶相比是有活性的。
在本发明说明书中,术语“洗涤剂”指通常用于洗涤或餐具洗涤的洗涤剂成分的混合物。类似地“洗涤剂组分”指在洗涤剂或餐具洗涤组合物中通常见到的组分或成分,将在下文的描述中给出其实例。
应当理解当在洗涤和/或餐具洗涤条件下检测时,用本发明方法制备的变异体除对钙的依赖性降低和/或对洗涤剂或一种或多种洗涤剂组分的耐受性提高外,显示出更好或超过其亲本脂解酶的脂解活性。
可以用本领域已知的适宜方法确定在本发明方法步骤c)中限定的筛选标准。在下文的物质和材料部分描述了用于本发明目的的特别适宜的检测方法。
本发明的另一方面涉及DNA构建体,它含有编码脂解酶变异体的突变的DNA序列,所述变异体与亲本脂解酶相比对钙的依赖性降低和/或对洗涤剂或洗涤剂组分的耐受性提高,所述DNA序列是从在本发明方法步骤c)中筛选的宿主细胞中分离。
本发明的另一方面涉及携带所述DNA构建体的重组表达载体,用所述DNA构建体或载体转化的细胞以及通过在适于生产所述变异体的条件下培养所述细胞,此后从培养物中回收所述变异体从而生产亲本脂解酶变异体的方法。
本发明的最后一方面涉及脂解酶变异体和所述变异体作为洗涤剂酶,特别是在洗涤或餐具洗涤中的应用,以及含有所述变异体的洗涤剂添加剂和洗涤剂组合物。本发明的详细描述克隆编码亲本脂解酶的DNA序列
利用本领域已知的方法,可以从生产所需亲本酶的任何细胞或微生物中分离编码亲本脂解酶的DNA序列,以便按本发明方法对其进行随机诱变。
例如,从预期含有所述序列的生物体中通过建立cDNA或基因组文库,然后用常规方法筛选阳性克隆来分离所述DNA序列。所述方法的实例是与根据标准技术(参见Sambrook et al.,1989)以亲本酶(如果可获得序列资料)或有关脂解酶(如果不能得到有关亲本酶的序列资料)的DNA序列为基础制备的寡核苷酸探针杂交,和/或筛选表达脂解,如脂酶活性的克隆,和/或筛选生产与抗亲本脂解酶的抗体反应的蛋白质的克隆。
根据本发明从cDNA或基因组文库分离编码待修饰的亲本脂解酶的DNA序列的优选方法是使用简并寡核苷酸探针的聚合酶链反应(PCR),所述探针是以亲本酶的DNA或氨基酸序列为基础制备的。例如,可以用美国专利4683202或R.K.Saike等人(1988)描述的技术完成PCR。
另外,可以通过已建立的标准方法,如由Beauicage和Caruthers(1981)描述的亚磷酰胺方法或Matthes等人描述的方法(1984)经合成而制备编码亲本酶的DNA序列。根据亚磷酰胺方法,用例如自动DNA合成仪合成寡核苷酸,将其纯化,退火,连接并克隆在适当的载体中。
最后,根据标准方法,可以从通过连接合成的,基因组的或cDNA源(适当的)的片段而制备的混合的基因组和合成的DNA,混合的合成的和cDNA或混合的基因的和cDNA源DNA制备编码所述亲本酶的DNA序列,所述片段对应于编码亲本酶的完整DNA序列的各个部分。随机诱变
可以利用本领域已知的任何方法,很容易地完成根据本发明方法步骤a)需完成的随机诱变编码亲本脂解酶的DNA序列。
例如,可以利用适宜的物理或化学诱变剂,利用适宜的寡核苷酸或使所述DNA序列经PCR产生的诱变来完成随机诱变。此外,使用任何组合的这些诱变剂可以完成随机诱变。
所述诱变剂可以是如诱导碱基转换,碱基颠换,倒位,scrambling,缺失和/或插入的诱变剂。
适用于本发明目的的物理或化学诱变剂的实例包括紫外线(UV)辐射,羟胺,N-甲基-N’-硝基-N-亚硝基胍(MNNG),O-甲基羟胺,硝酸,甲烷磺酸乙酯(EMS),亚硫酸氢钠,甲酸和核苷酸类似物。
当使用所述的试剂时,通常在适于诱变发生的存在所述诱变剂的条件下,通过保温待诱变的编码亲本酶的DNA序列,然后筛选具有所需特性的突变的DNA来完成所述诱变。
当利用寡核苷酸完成诱变时,在待改变的位置合成所述寡核苷酸时,将所述寡核苷酸与三种非亲本的核苷酸掺杂在一起。可以完成掺杂以便避免不想要的氨基酸密码子。可以通过使用例如PCR,LCR或任何DNA聚合酶和连接酶的公知技术,将掺杂的寡核苷酸掺入编码脂解酶的DNA中。
当使用PCR产生的诱变时,使化学处理的或未处理的编码亲本脂解酶的基因在增加核苷酸错掺的条件下进行PCR(Deshler 1992,Leung etal.,1989)。
为了随机诱变编码脂解酶的DNA,可以使用大肠杆菌(Fowler etal.1974),啤酒酵母或任何其他微生物的增变菌株,例如通过将含亲本酶的质粒转化到增变菌株中,使增变菌株与所述质粒一起生长,然后从增变菌株中分离突变的质粒。随后可以将突变的质粒转化到表达生物中。
待诱变的DNA序列易于存在于从表达亲本脂解酶的生物制备的基因组或cDNA文库中。另外,所述DNA序列可存在于适当的载体,如质粒或噬菌体上,所述载体可以与诱变剂一起保温或暴露于诱变剂。所述待诱变的DNA还可以经整合存在于宿主细胞的基因组中或存在于所述细胞所含的载体上。最后,待诱变的DNA还可以是分离的形式。应当理解将要经随后诱变的DNA序列优选的是cDNA或基因组DNA序列。
在某些情况下,在进行表达步骤(b)或筛选步骤(c)之前可以方便地扩增突变的DNA序列。可以根据本领域已知的方法完成所述扩增,目前优选的方法是利用寡核苷酸引物的PCR产生的扩增,所述引物是以亲本酶的DNA或氨基酸序列为基础而制备的。
在与诱变剂一起保温或暴露于诱变剂后,通过在允许表达的条件下培养携带所述DNA序列的适宜宿主细胞而表达突变的DNA。用于该目的的宿主细胞可以是用选择性地存在于载体上的突变DNA序列转化的,或者是在诱变过程中携带了所述编码亲本酶的DNA序列的宿主细胞。下面举出了适宜宿主细胞的例子。突变的DNA序列还可以含有编码具有使突变DNA序列表达之功能基团的DNA序列。
应该理解,已经仔细筛选了上述步骤(c)中所提到的选择标准。因此,不必局限于任何理论,对钙依赖性降低的筛选会得到具有全面改善之性能的变异体,即对钙的需求可以被认为是最佳活性的限制因素,特别是在只存在少量游离钙的条件下。与洗涤剂脂酶相关,通常从洗涤水中得到所需的游离钙离子,因此,脂解活性依赖于水中钙的含量。
所述变异体可以对任何类型的洗涤剂或洗涤剂组分有改善的耐受性,这将在下文作进一步描述。优选的洗涤剂组分是非离子的,阴离子,阳离子,两性表面活性剂。非离子表面活性剂的实例包括脂肪醇乙氧基化物,阴离子表面活性剂的实例包括LAS,硫酸烷基酯,脂肪醇乙氧基硫酸盐等。
特别是,设想对非离子表面活性剂脂肪醇乙氧基化物(市售的实例是DobanolR)改善的耐受性可以作为洗涤性能改善的标志。
利用以下列原理为基础的过滤方法可以方便地完成步骤(c)的筛选:
在适当的培养基中和适于所述酶分泌的条件下,培养能够表达所需突变脂解酶的微生物,所述培养基配有双层滤膜,包括第一蛋白质结合滤膜和在其上的有较低蛋白质结合能力的第二滤膜。微生物位于第二滤膜上。培养后,从含微生物的第二滤膜中分离含有分泌自所述微生物之酶的第一滤膜。对第一滤膜进行所需的酶活性筛选,然后鉴定在第二滤膜上的对应微生物菌落。
用于结合酶活性的滤膜可以是任何蛋白质结合滤膜,如尼龙或硝酸纤维素滤膜。带有表达生物菌落的顶部滤膜可以是没有或有较低蛋白质结合亲和性的任何滤膜,如乙酸纤维素或DuraporeTM。可以用用于筛选的任何条件预处理所述滤膜或在酶活性检测过程中对其进行处理。
可以用染料,荧光,沉淀,pH指示剂,IR-吸收值或用于检测酶活性的任何已知的技术来检测酶活性。
可以用任何固定剂,如琼脂糖,琼脂,明胶,聚丙烯酰胺,淀粉,滤纸,布或固定剂的任何结合来固定待测的化合物。
可以用亮绿,若丹明B或苏丹黑结合脂,如橄榄油或猪脂来检测脂酶活性。用于鉴定具有改善的洗涤性能的亲本脂解酶变异体的筛选标准可以是如EGTA,EDTA,非离子或阴离子表面活性剂,碱性pH或任何洗涤剂组合物结合上述一种酶活性检测指标。
可以选择在本发明滤膜检测中所用的筛选标准以便与待筛选酶的所需特性或用途相一致。例如,在筛选特别用于纸浆工业的脂酶时,适合于筛选温度稳定性提高的酸性脂酶。在检测前或检测时,通过使用酸性pH(如pH4)的缓冲液和/或在较高的温度下保温来达到该目的。
用比前次诱变处理更严格的筛选标准可以很方便地按上述步骤(a)-(c)将在步骤(c)中产生的宿主细胞进行再进一步的诱变。
可以用在步骤(c)中筛选的宿主细胞直接生产脂解酶变异体。另外,用在“本发明变异体之表达”部分所描述的方法(其中列出了适宜的宿主细胞),可以从宿主细胞中分离编码变异体的DNA序列并将其插入到另一适宜的宿主细胞中。定位随机诱变
可以将本发明的随机诱变有利地定位于所述亲本脂解酶的某一部分。当经鉴定发现所述酶的特定区域对所述酶的某一特性特别重要,而且若进行修饰,则期望会得到具有改善特性的变异体时,这种方法是有利的。当阐明了所述亲本酶的三维结构,而且所述三维结构与所述酶的功能有关时,就可以鉴定所述区域。
用上文所述的PCR产生的诱变技术或本领域已知的任何其他适宜的技术可以方便地完成定位随机诱变。
另外,如通过被插入到适宜的载体中,可以分离编码待修饰部分的DNA序列,随后将所述部分用上述讨论的任何诱变方法进行诱变。亲本脂解酶
本发明待修饰的亲本脂解酶可以是任何具有上述脂解活性的酶。脂解酶的实例包括脂酶,酯酶,角质酶和磷脂酶。
优选的,经定位随机诱变修饰亲本脂解酶,所述诱变是针对编码脂接触区或部分所述区的DNA序列而完成的。
到目前为止,已经发现晶体化的所有脂酶均含有至少一个表面环状结构(也称为罩或flap),当脂酶处于失活形式时,所述结构盖住了活性位点(所述脂酶的一个实例是由Brady et al.,1990,描述的)。在所述脂酶被激活时,所述环状结构被移开,从而暴露出活性位点的残基,在活性位点Ser周围产生一个疏水表面,这样提高了表面疏水性并在水解时或期间与脂底物相互作用。所述激活称作界面激活,由Tilbeurgh等人(1993)作了进一步描述。
为了本发明的目的,将激活后产生的表面称为“脂接触区”,包括在所述表面内或其形成部分的氨基酸残基,可以是环状结构形式。当与脂表面接触而激活后,在脂酶水解来自脂相的甘油三酯时或过程中,这些残基参与了脂酶与底物的相互作用。
脂接触区含有用于脂底物结合的结合区,它是脂接触区的一部分,单个脂分子在水解前与其结合。所述结合区又含有一个酰基结合疏水缝隙和一个所谓的水解袋,它位于活性位点Ser周围,认为在此发生脂类底物的水解。在目前已知的所有脂酶中,很容易如从用适宜的计算机程序产生的所述脂酶的三维结构识别脂接触区。在WO92/05249的图1和2中分别示出了无活性和被激活脂酶的构型。
在本发明中详细讨论的Humicola lanuginosa脂酶的脂接触区由氨基酸残基21-25,36-38,56-62,81-98,110-116,144-147,172-174,199-213和248-269限定。已经在计算机模拟的脂酶和脂底物之间相互作用的基础上鉴定了这些残基。
其它脂解酶的脂接触区通过以下方法限定:(a) 计算3-D分子结构的疏水向量,(b) 通过直链序列活性位点Ser后的第二个氨基酸的Cα原子向向量垂直切割,和(c) 包括所有至少有一个原子在向量切面一边的残基,和(d) 选择那些至少有一个原子在所述蛋白质表面5埃内的残基(如果是脂酶,则以其开或闭合的形式)。
当脂酶为开环或闭合形式时,通过将表面可及度(Lee,B.andRichards,F.M.1971,Mol.Biol.55:379-400)为至少10%的残基的残基向量加起来,可从蛋白质结构计算疏水向量。将残基向量的起始点定义为残基的Cα-原子,其方向是通过侧链的质量中心。各残基向量的大小定义为残基相对的转移游离能。
用Connolly程序计算各残基的表面可及度。
优选的,在编码亲本脂酶罩区和/或疏水缝隙的,或所述罩区和/或疏水缝隙之部分的DNA序列部分上进行定位随机诱变。
本发明待修饰的亲本脂解酶可以是任何来源的。因此,所述酶可以是哺乳动物,植物,脊椎动物或任何其他来源的。但是优选的酶是微生物来源的,已经发现许多微生物菌株生产特别适用于洗涤剂目的的酶。
更具体地说,亲本脂解酶的DNA序列可以得自真菌,即酵母或丝状真菌。例如,所述DNA序列可以是得自腐质霉,如H.lanuginosa的菌株,Rhizomucor,如Rh.miehei的菌株,根霉的菌株,假丝酵母的菌株,镰孢,如F.solani pisi的菌株,黑星菌,如苹果黑星菌的菌株,毛盘孢属,如盘长孢状毛盘孢或葫芦科毛盘孢的菌株或青霉属,如小刺青霉或沙门氏柏干酪青霉的菌株的DNA序列。
在本发明说明书中,“可得自”不仅指由所研究的生物菌株生产的酶,还包括由从所述菌株分离的DNA编码并在用所述DNA序列转化的宿主生物中生产的酶。此外,该术语还指于合成的和/或cDNA源的DNA序列编码并具有所需酶的鉴定特征的酶。
特别有用的亲本脂解酶是得自H.lanuginosa的菌株,如H.lanBginosa菌株DSM4109的脂酶或其类似物,或得自Rh.mucor的菌株或C.antarctica的菌株的脂酶。
在本发明说明书中,术语“类似物”包括多肽,所述多肽含有与H.lanuginosa脂酶有一个或多个氨基酸残基不同的氨基酸序列,并与所述脂酶的氨基酸序列有至少70%的同源性(按两个序列之间的相同性来判断),如至少75%,80%,90%或95%的同源性,与该脂酶具有免疫交叉反应性,和/或所述多肽由与寡核苷酸探针杂交的DNA序列编码,所述探针是以所述脂酶的氨基酸序列或编码所述脂酶的DNA序列为基础的。
所述类似物可以是如通过修饰编码所述脂酶的DNA序列而制备的H.lanuginosa脂酶衍生物,所述修饰会导致将一个或多个氨基酸残基加到所述脂酶的N-和C-末端,在所述氨基酸序列的一个或多个不同位点发生取代,在所述脂酶的任一末端或两个末端或所述氨基酸序列中的一个或多个位点发生缺失,或在所述氨基酸序列的一个或多个位点插入一个或多个氨基酸残基。根据熟知的技术,可以经定点或随机诱变或这些技术的结合完成所述DNA序列的修饰。
此外,类似物可以是得自另一生物,如在前面“本发明背景”中提到的那些的多肽。
可以将编码亲本H.lanuginosa脂酶类似物的DNA序列在允许所述DNA序列杂交的条件下与相关的寡核苷酸探针杂交。例如,所述条件是特定的条件,如包括预浸在5xSSC和在由20%甲酰胺,5xDenhardt’s溶液,50mM磷酸钠,pH6.8和50μg变性的声处理的牛胸腺DNA组成的溶液中,于-40℃预杂交1小时,然后在用100μMATP补充的相同溶液中,于-40℃杂交18小时,或按例如Sambrook等人(1989)描述的其他方法完成杂交。
利用抗纯化脂酶的至少一个抗原决定簇的抗体,可检测H.Lanuginosa脂酶类似物的免疫交叉反应性。该抗体可为单克隆或多克隆抗体,且可按已知方法如Hudson等人所述的方法(1989)制备。利用本领域已知的检测方法来测定免疫交叉反应性,这类检测方法的例子包括如Hudson等人(1989)所述的Western吸印法或基团免疫扩散法。
若亲本脂解酶是得自DSM4109菌株的H.lanuginosa脂酶或其类似物时,优选的是经随机诱变的DNA序列含有编码至少由所述脂酶的氨基酸残基21-27,56-64,81-99,83-100,108-116,145-147,174,202-213,如205-211,226-227,246-259或263-269所限定的区域的部分DNA序列的DNA序列组成。所述脂酶的DNA和氨基酸序列从SEQ ID NO1和2中可以分别看到。
可以在一个或多个这些区域中完成定位随后诱变,而且优选的是在至少两个这种区域内完成。
本发明待修饰的亲本脂解酶可以得自细菌。例如编码所述亲本脂解酶的DNA序列可得自假单孢菌属,如葱头假单孢菌,产碱假单孢菌,类产碱假单孢菌,门多茜娜假单胞菌(也称为恶臭假单孢菌),丁香假单孢菌,铜绿假单孢菌或莓实假单孢菌的菌株,芽孢杆菌属,如枯草芽孢杆菌或短小芽孢杆菌的菌株或链霉菌属,如疮痂病链霉菌的菌株。
亲本细菌脂解酶可以是得自上述任何种的脂酶,如在EP218272,EP331,376和EP407225中描述的假单孢菌脂酶或角质酶,如在WO88/09367中描述的。本发明的变异体
为了便于参考,用下列命名来描述本发明的具体变异体:
原始氨基酸:位置:取代的氨基酸
根据该命名,按如下表示位置96的天冬氨酸为缬氨酸所取代:
Asp 96 Val 或D96V按如下表示缺失相同位置的天冬氨酸:
Asp 96* 或D96*按如下表示另一氨基酸残基如Lys的插入:
Asp 96 ValLys 或D96VK
用加号隔开多个突变,即:
Asp 96 Val+Glu 87 Lys 或D96V+E87K代表在96和87位的天冬氨酸和谷氨分别被缬氨酸和赖氨酸所取代。
若将一个或多个选择性氨基酸残基插入到给定的位置,则表示为D96V,N或D96V或D96N
此外,若在本文中鉴定了一个适于修饰的位置,但未说明任何具体的修饰,则应理解为可以用任何氨基酸残基取代该位置的氨基酸残基。因此,例如若只说明了在96位氨基酸可以进行修饰,但未具体说明,则应理解为天冬氨酸可以被缺失或被任何其他氨基酸所取代,即可在该位置插入R,N,A,C,Q,E,G,H,I,L,K,M,F,P,S,T,W,Y,V或其他氨基酸中的任何一种。
最后,若本文鉴定了亲本H.lanuginosa脂酶的突变,则应理解为包括所述脂酶类似物(如上述鉴定的)的相似突变。
本发明的另一方面还涉及用本发明上述方法构建的变异体。
若亲本脂解酶是从菌株DSM4109得到的H.lanuginosa脂酶或其类似物,则优选的是所述变异体含有至少下列位置之一上的突变:S58,T64,S83,N94,K98,I100,A121,E129,D167,R205,K237,I252,P256或G263。应理解在取代的情况下,可以插入除野生型氨基酸残基外的任何氨基酸残基,如选自R,N,A,C,Q,E,G,H,I,L,K,M,F,P,S,T,W,Y,V,D的氨基酸残基。
就本发明人所知,现有技术中在这些位置内没有公开具体的突变。
此外本发明还涉及可得自DSM4109的H.lanuginosa脂酶或所述脂酶类似物的变异体,其中已经用不同于亮氨酸的氨基酸,即R,N,A,C,Q,E,G,H,I,K,M,F,P,S,T,W,Y,V,D替代了氨基酸残基L264。
优选的,本发明变异体含有至少一个下列突变K46R,E57G,G61S,S83T,S58F,D62C,T64R,I90F,G91A,N92H,N94I,N94K,L97M,K98I,I100V,D102K,A121V,E129K,D167G,R205K,E210W,K237M,N259W,I252L,D254W,P256T,G263A,L264Q或T267W。
已经发现或预计这些位置对于酶活性和/或洗涤剂耐受性是重要的。氨基酸残基的编号是以成熟脂酶的氨基酸为准。
优选的,本发明该方面的变异体含有至少下列突变之一:S83T,N94K,A121V,D167G,R205K。
应该理解,本发明包括亲本H.lanuginosa脂酶的变异体,所述变异体含有本文所限定的两个或更多突变或本文所限定的一个或多个突变加上在WO92/05249,WO94/25577和WO94/01541中公开的任何突变。
本发明的另一方面还涉及含有至少下列突变之一的可从DSM4109可得到的H.lanuginosa脂酶或其类似物的变异体:N94K+D96AS83T+N94K+D96NE87K+D96VE87K+G91A+D96AN94K+F95L+D96HA121V+R205K+E210QF95C+D96NG91S+L93V+F95CE87K+G91A+D96R+I100VE87K+G91AS83T+E87K+Q249RS83T+E87K+W89G+G91A+N94K+D96VN73D+S85T+E87K+G91A+N94K+D94AE87K+G91A+L93I+N94K+D96AD167G+E210VN73D+E87K+G91A+N94I+D96GS83T+E87K+G91A+N92H+N94K+D96ME210WE56T+D57L+I90F+D96L+E99KE56R+D57L+V60M+D62N+S83T+D96P+D102ED57G+N94K+K96L+L97ME87K+G91A+D96R+I100V+E129K+K237M+I252L+P256T+G263A+L264QE56R+D57G+S58F+D62C+T64R+E87G+G91A+F95L+D96P+K98I+K237MK46R+E56R+G61SD102KD167GN73D+E87K+G91A+N94I+D96GE210VE210W N251W+D254W+T267WS83T+E87K+G91A+N92H+N94K+D96ME56R+I90F+D96L+E99KD57G+N94K+D96L+L97M
已经发现这些变异体对钙的抗性降低和/或对洗涤剂组分,如非离子表面活性剂脂肪醇乙氧基化物的耐受性提高,因此认为它们特别适用于洗涤剂或餐具洗涤目的。已经用本发明方法构建了所述变异体,随后对已介绍的突变进行了表征并将在下文实施例作进一步的描述。显然构建这些变异体的其他方法应以使用适当寡核苷酸探针的定点诱变为基础。将在实施例3-6中说明该方法。本发明变异体的表达
根据本发明,用表达载体可以以酶形式表达用上述方法或本领域已知的任何其他方法制备的编码脂解酶变异体的突变DNA序列,所述表达载体通常含有编码启动子的控制序列,操纵子,核糖体结合位点,翻译起始信号和可选择的阻遏物基因或各种激活物基因。
携带编码本发明变异体的DNA序列的重组表达载体可以是任何适用于重组DNA方法的载体,而且载体的选择取决于载体所要导入的宿主细胞。因此,所述载体可以是自主复制载体,即作为染色体外成分存在的载体,其复制不依赖于染色体的复制,如质粒,噬菌体或染色体外成分,小染色体或人工染色体。另外,所述载体可以是在导入到宿主细胞后,将整合到宿主细胞基因组内并随其整合的染色体一起复制的载体。
在所述载体中,所述DNA序列应与适宜的启动子序列可操作相连。所述启动子可以是在所选的宿主细胞中有转录活性并可得自编码与宿主细胞同源或异源之蛋白质的基因的任何DNA序列。指导编码本发明变异体的DNA,特别是在细菌宿主中转录的适宜启动子的实例是大肠杆菌lac操纵子的启动子,天蓝色链霉菌琼脂酶(agarase)基因dagA启动子,地衣形芽孢杆菌α-淀粉酶基因(amyL)的启动子,如在WO93/10249中描述的嗜热脂肪芽孢杆菌产麦芽糖(maitogenic)淀粉酶基因(amyM)的启动子,解淀粉芽孢杆菌α-淀粉酶基因(amyQ)的启动子,枯草芽孢杆菌xylA和xylB基因的启动子等。为了在真菌宿主中转录,有用启动子的实例是得自编码米曲霉TAKA淀粉酶,Rhizomucor miehei天冬氨酸蛋白酶,黑曲霉中性α-淀粉酶,黑曲霉酸稳定的α-淀粉酶,黑曲霉葡糖淀粉酶,Rhizomucor miehei脂酶,米曲霉碱性蛋白酶,米曲霉磷酸丙糖异构酶或构巢曲霉乙酰胺酶(acetamidase)的基因的启动子。
本发明的表达载体还含有适宜的转录终止子,和在真核细胞中,与编码本发明变异体的DNA序列可操作相连的多聚腺苷酸化序列。可依从与启动子相同的来源得到终止子和多聚腺苷酸化序列。
所述载体还可以含有能够使所述载体在所需宿主细胞中复制的DNA序列。所述序列的实例是质粒pUC19,pACYC177,pUB110,pE194,pAMB1和pIJ702的复制源点。
所述载体还可含有选择性标记,如弥补宿主细胞中一个缺陷的产物基因,如来自枯草芽孢杆菌或地衣形芽孢杆菌的dal基因,或赋予抗生素抗性如氨苄青霉素,卡那霉素,氯霉素或四环素抗性的基因。此外,所述载体可含有曲霉选择标记,如amdS,argB,niaD和sD,产生潮霉素抗性的标记或通过如在WO91/17243中描述的共转化而完成的选择。
从有些方面看,细胞内表达是有利的,例如当使用特定的细菌作为宿主细胞时,但通常优选的是细胞外表达。亲本脂解酶本身可含有可以使被表达的酶分泌到培养基中的前序列。如果需要,可以用不同的前区或信号序列替代所述该前区,这通过用编码不同前区的DNA序列可以很方便地完成。
用于连接分别编码亲本脂解酶变异体的本发明DNA构建体,启动子,终止子和其他成分并将其插入到含复制所必需的信息的适宜载体中的方法是本领域专业人员熟知的(参见如,Sambrook et al.,(1989))。
在重组生产本发明亲本脂解酶变异体的过程中,可以用含有上述所定义的本发明DNA构建体或表达载体的细胞作为宿主细胞。通过方便地将所述DNA构建体整合到宿主染色体中,用编码所述变异体的本发明DNA构建体可以转化所述细胞。由于所述DNA序列可以更稳定地保持在细胞中,所以通常认为这种整合是有利的。按照常规方法,如通过同源或异源重组可以将所述DNA构建体整合到宿主染色体中。另外,根据不同类型的宿主细胞,可以用下文所述的表达载体转化细胞。
本发明的细胞可以是高等生物,如哺乳动物或昆虫的细胞,优选的是微生物如细菌或真菌(包括酵母)细胞。
适宜细菌的实例是革兰氏阳性菌如枯草芽孢杆菌,地衣形芽孢杆菌,缓慢芽孢杆菌,短小芽孢杆菌,嗜热脂肪芽孢杆菌,嗜碱芽孢杆菌,解淀粉芽孢杆菌,凝结芽孢杆菌,环状芽孢杆菌,Bacillus lautus,巨大芽孢杆菌,苏云金芽孢杆菌或变青链霉菌或鼠灰链霉菌,或革兰氏阴性菌如大肠杆菌。例如用原生质体转化或方法本身已知的感受态细胞可完成细菌的转化。
从糖酵母属或裂殖酵母属的种,如啤酒酵母中选择适用的酵母生物体。丝状真菌可以是曲霉属的种,如米曲霉,黑曲霉或构巢曲霉。用本身已知的方法包括原生质体形成,原生质体转化和细胞壁再生的方法可以转化真菌细胞。在EP238023中描述了适用于转化曲霉宿主细胞的方法。
在另一方面,本发明涉及生产本发明亲本脂解酶的变异体的方法,所述方法包括在允许生产所述变异体的条件下培养上述宿主细胞,然后从所述细胞和/或培养基中回收所述变异体。
用于培养细胞的培养基可以是任何适于所述宿主细胞生长并表达本发明亲本脂解酶变异体的常规培养基。适宜的培养基可从商业上的供应商处得到或可以根据公开的配方(如美国典型培养物收集中心的目录)制备。
用熟知的方法可以从培养基中很方便地回收从宿主细胞中分泌的本发明变异体,所述方法包括通过离心或过滤从培养基中分离细胞,然后用盐,如硫酸铵方法,接着用层析方法,如离子交换层析,亲和层析等沉淀蛋白质类组分。用于餐具洗涤和洗涤的洗涤剂添加剂和组合物
由于本发明的变异体对钙的依赖性降低和/或对洗涤剂或洗涤剂组分的耐受性提高,所以所述变异体特别适用于补充到洗涤剂组合物中,如用于ph为7-13,特别是pH8-11的洗涤剂组合物。洗涤剂组合物
根据本发明,本发明的脂酶变异体通常是作为洗涤剂组合物的一个成分。例如,将其包含在无粉尘的颗粒,稳定的液体或保护的酶形式的洗涤剂组合物中。可以例如按US4106991和4661452(两者均是Novo IndustriA/S的)中的公开生产无粉尘颗粒,而且可用本领域已知的方法将其包被。蜡状包被材料是分子量为1000-20000的聚(环氧乙烷)产物(聚乙二醇,PEG);有16-50个环氧乙烷单位的乙氧基化的壬基酚;乙氧基化的脂肪族醇,其中所述醇含12-20个碳原子,并且其中有15-80个环氧乙烷单位;脂肪族醇;脂肪酸;和脂肪酸的单-,二-和甘油三酯。在专利GB1483591中给出了适于流床技术应用的成膜包被物质。液体酶制品例如可以按照常规方法,通过加入多元醇如丙二醇,糖或糖醇,乳酸或硼酸而将其稳定化。其他酶稳定剂是本领域熟知的。根据EP238216中公开的方法可以制备保护的酶。
本发明的洗涤剂组合物可以是任何方便的形式,如粉,颗粒,膏或液体。液体洗涤剂可以是含水的,通常含有高达70%的水和0-30%的有机溶剂,或不含水。
所述洗涤剂组合物含有一种或多种表面活性剂,它们可以分别是阴离子,非离子,阳离子或两性离子的。洗涤剂通常含有0-50%的阴离子表面活性剂,如直链烷基苯磺酸盐(LAS),α-烯属磺酸盐(AOS),烷基硫酸盐(脂肪族醇硫酸盐)(AS),脂肪醇乙氧基硫酸盐(AEOS或AES),二级链烷磺酸盐(SAS),α-硫代脂肪酸甲基酯,烷基-或烯基琥珀酸,或皂。它还可含有0-40%的非离子表面活性剂,如脂肪醇乙氧基化物(AEO或AE),羰基化的脂肪醇乙氧基化物,壬基酚乙氧基化物,烷基聚苷(alkylpolyglycoside),烷基二甲基胺氧化物,乙氧基化的脂肪酸单乙醇酰胺,脂肪酸单乙醇酰胺或聚羟基烷基脂肪酸酰胺(例如在WO92/06154中描述的)。
所述洗涤剂组合物还可含有一种或多种其他酶,如淀粉酶,支链淀粉酶,角质酶,蛋白酶纤维素酶过氧化物酶,氧化酶(如漆酶)和/或另一种脂酶。
所述洗涤剂可含有1-65%的助洗剂或配位剂,如沸石,二磷酸,三磷酸,磷酸,柠檬酸,次氮基三乙酸酯(NTA),乙二胺四乙酸(EDTA),二亚乙基三胺五乙酸(DTMPA),烷基-或烯基琥珀酸,可溶的硅酸盐或层化的硅酸盐(如来自Hoechst的SKS-6)。所述洗涤剂还可是未配制的,即不含有洗涤剂助洗剂。
所述洗涤剂可含有一种或多种聚合物。实例是羧甲基纤维素(CMC),聚乙烯吡咯烷酮(PVP),聚乙二醇(PEG),聚乙烯醇(PVA),聚羧酸酯如聚丙烯酸酯,马来酸/丙烯酸共聚物和月桂基异丁烯酸/丙烯酸共聚物。
所述洗涤剂可含有漂白系统,它可含有与过酸形成漂白活化剂,如四乙酰基亚乙基二胺(TAED)或壬酰氧苯磺酸盐(NOBS)结合的H2O2源,如过硼酸盐或过碳酸盐。另外,漂白系统可含有如酰胺,酰亚胺或砜类的过氧酸。
用常规稳定剂,如多元醇如聚乙二醇或甘油,糖或糖醇,乳酸,硼酸或硼酸衍生物,如芳香族硼酸酯来稳定本发明洗涤剂组合物中的酶,而且按如WO92/19709和WO92/19708中的描述配制所述组合物。
所述洗涤剂还可含有其他常规洗涤剂成分,如织物调理剂包括粘土,泡沫促进剂,顽固泡沫抑制剂,抗-腐蚀剂,污垢悬浮剂,抗-污垢再沉淀剂,染料,杀菌剂,荧光增白剂或香料。
pH(在使用浓度的水溶液中测量的)通常是中性的或碱性的如7-11。
本发明范围内洗涤剂组合物的具体形式包括:(1)配制成堆积密度至少为600g/l的洗涤剂组合物含有
(2)配制成堆积密度至少为600g/l的洗涤剂组合物含有
(3)配制成堆积密度至少为600g/l的洗涤剂组合物含有
(4)配制成堆积密度至少为600g/l的洗涤剂组合物含有
(5)含水液体洗涤剂组合物含有
(6)含水的液体洗涤剂组合物含有
(7)配制成堆积密度至少为600g/l的颗粒的洗涤剂组合物含有
(8)配制成颗粒的洗涤剂组合物含有
(9)配制成颗粒的洗涤剂组合物含有
(10)含水液体洗涤剂组合物含有
(11)含水液体洗涤剂组合物含有
(12)配制成堆积密度至少为600g/l的颗粒的洗涤剂组合物含有
(13)在1)-12)描述的洗涤剂配方,其中用(C12-C18)烷基硫酸盐取代所有直链烷基苯磺酸盐(14)配制成堆积密度至少为600g/l的颗粒的洗涤剂组合物含有
(15)配制成堆积密度至少为600g/l的颗粒的洗涤剂组合物含有
(16)在1)-15)描述的洗涤剂配方中,含有稳定化的或密封的过酸,作为一种添加剂组分或取代已经具体化的漂白系统。(17)在1),3),7),9)和12)描述的洗涤剂组合物中用过碳酸盐代替过硼酸。(18)在1),3),7),9),12),14)和15)描述的洗涤剂组合物中另外含有锰催化剂。锰催化剂可以是例如在“Efficient mangaese catalysts forlow-temperature bleaching”Nature 369,1994,pp.637-639中描述的化合物之一。(19)配制成不含水的洗涤液的洗涤剂组合物,含有液体非离子表面活性剂,如直链烷氧化的伯醇,助洗剂系统(如磷酸),酶和碱。所述洗涤剂还可含有阴离子表面活性剂和/或漂白系统。
直链烷基苯磺酸盐(按酸计算) | 7-12% |
脂肪醇乙氧基硫酸盐(如C12-18醇,1-2EO)或烷基硫酸盐(如C16-18) | 1-4% |
脂肪醇乙氧基化物(如C14-15醇,7EO) | 5-9% |
碳酸钠(Na2CO3) | 14-20% |
可溶性硅酸盐(Na2O,2SiO2) | 2-6% |
沸石(NaAlSiO4) | 15-22% |
硫酸钠(Na2SO4) | 0-6% |
柠檬酸钠/柠檬酸(C6H5Na3O7/C6H8O7) | 0-15% |
过硼酸钠(NaBO3·H2O) | 11-18% |
TAED | 2-6% |
羧甲基纤维素 | 0-2% |
聚合物(如马来酸/丙烯酸共聚物,PVP,PEG) | 0-3% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
直链烷基苯磺酸盐(按酸计算) | 6-11% |
脂肪醇乙氧基硫酸盐(如C12-18醇,1-2EO)或烷基硫酸盐(如C16-18) | 1-3% |
脂肪醇乙氧基化物(如C14-15醇,7EO) | 5-9% |
碳酸钠(Na2CO3) | 15-21% |
可溶性硅酸盐(Na2O,2SiO2) | 1-4% |
沸石(NaAlSiO4) | 24-34% |
硫酸钠(Na2SO4) | 4-10% |
柠檬酸钠/柠檬酸(C6H5Na3O7/C6H8O7) | 0-15% |
羧甲基纤维素 | 0-2% |
聚合物(如马来酸/丙烯酸共聚物,PVP,PEG) | 1-6% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
直链烷基苯磺酸盐(按酸计算) | 5-9% |
脂肪醇乙氧基化物(如C14-15醇,7EO) | 7-14% |
为脂肪酸的皂(如C16-22脂肪酸) | 1-3% |
碳酸钠(Na2CO3) | 10-17% |
可溶性硅酸盐(Na2O,2SiO2) | 3-9% |
沸石(NaAlSiO4) | 23-33% |
硫酸钠(Na2SO4) | 0-4% |
过硼酸钠(NaBO3·H2O) | 8-16% |
TAED | 2-8% |
磷酸盐(如EDTMPA) | 0-1% |
羧甲基纤维素 | 0-2% |
聚合物(如马来酸/丙烯酸共聚物,PVP,PEG) | 0-3% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
直链烷基苯磺酸盐(按酸计算) | 8-12% |
脂肪醇乙氧基化物(如C12-15醇,7EO) | 10-25% |
碳酸钠(Na2CO3) | 14-20% |
可溶性硅酸盐(Na2O,2SiO2) | 1-5% |
沸石(NaAlSiO4) | 25-35% |
硫酸钠(Na2SO4) | 0-10% |
羧甲基纤维素 | 0-2% |
聚合物(如马来酸/丙烯酸共聚物,PVP,PEG) | 1-3% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
直链烷基苯磺酸盐(按酸计算) | 15-21% |
脂肪醇乙氧基化物(如C12-15醇,7EO或C12-15醇,5EO) | 12-18% |
脂肪酸(如油酸)皂 | 3-13% |
烯基琥珀酸(C12-14) | 0-13% |
氨基乙醇 | 8-18% |
柠檬酸 | 2-8% |
磷酸盐 | 0-3% |
聚合物(如PVP,PEG) | 0-3% |
硼酸(B4O7) | 0-3% |
乙醇 | 0-3% |
聚乙二醇 | 8-14% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
直链烷基苯磺酸盐(按酸计算) | 15-21% |
脂肪醇乙氧基化物(如C12-15醇,7EO或C12-15醇,5EO) | 3-9% |
脂肪酸(如油酸)皂 | 3-10% |
沸石(NaAlSiO4) | 14-22% |
柠檬酸钾 | 9-18% |
硼酸(B4O7) | 0-2% |
羧甲基纤维素 | 0-2% |
聚合物(如PVP,PEG) | 0-3% |
固定的聚合物如月桂基异丁烯酸/丙烯酸共聚物,摩尔比为25∶1,MW3800 | 0-3% |
甘油 | 0-5% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
脂肪族醇硫酸酯 | 5-10% |
乙氧基化的脂肪酸单乙醇酰胺 | 3-9% |
为脂肪酸的皂 | 0-3% |
碳酸钠(Na2CO3) | 5-10% |
可溶性硅酸盐(Na2O,2SiO2) | 1-4% |
沸石(NaAlSiO4) | 20-40% |
硫酸钠(Na2SO4) | 2-8% |
过硼酸钠(NaBO3·H2O) | 12-18% |
TAED | 2-7% |
聚合物(如马来酸/丙烯酸共聚物,PEG) | 1-5% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
直链烷基苯磺酸盐(按酸计算) | 8-14% |
乙氧基化的脂肪酸单乙醇酰胺 | 5-11% |
为脂肪酸的皂 | 0-3% |
碳酸钠(Na2CO3) | 4-10% |
可溶性硅酸盐(Na2O,2SiO2) | 1-4% |
沸石(NaAlSiO4) | 30-50% |
硫酸钠(Na2SO4) | 3-11% |
柠檬酸钠(C6H5Na3O7) | 5-12% |
聚合物(如PVP,马来酸/丙烯酸共聚物,PVP,PEG) | 1-5% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
直链烷基苯磺酸盐(按酸计算) | 6-12% |
非离子表面活性剂 | 1-4% |
为脂肪酸的皂 | 2-6% |
碳酸钠(Na2CO3) | 14-22% |
沸石(NaAlSiO4) | 18-32% |
硫酸钠(Na2SO4) | 5-20% |
柠檬酸钠(C6H5Na3O7) | 3-8% |
过硼酸钠(NaBO3·H2O) | 4-9% |
漂白激活剂(如NOBS或TAED) | 1-5% |
羧甲基纤维素 | 0-2% |
聚合物(如PVP,马来酸/丙烯酸共聚物,PVP,PEG) | 1-5% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
直链烷基苯磺酸盐(按酸计算) | 15-23% |
脂肪醇乙氧基硫酸盐(如C12-15醇,2-3EO) | 8-15% |
脂肪醇乙氧基化物(如C12-15醇,7EO,或C12-15醇,5EO) | 3-9% |
脂肪酸(如月桂酸)皂 | 0-3% |
氨基乙醇 | 1-5% |
柠檬酸钠 | 5-10% |
水溶助长剂(如甲苯磺酸钠) | 2-6% |
硼酸(B4O7) | 0-2% |
羧甲基纤维素 | 0-1% |
乙醇 | 1-3% |
聚乙二醇 | 2-5% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
直链烷基苯磺酸盐(按酸计算) | 20-32% |
脂肪醇乙氧基化物(如C12-15醇,7EO,或C12-15醇,5EO) | 6-12% |
氨基乙醇 | 2-6% |
柠檬酸 | 8-14% |
硼酸(B4O7) | 1-3% |
聚合物(如马来酸/丙烯酸共聚物,结合聚合物如月桂基异丁烯酸/丙烯酸共聚物) | 0-3% |
甘油 | 3-8% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂 | 0-5% |
白剂) |
阴离子表面活性剂(直链烷基苯磺酸盐,烷基硫酸盐,α-烯属磺酸盐,α-硫代脂肪酸甲基酯,链烷磺酸盐,皂) | 25-40% |
非离子表面活性剂(如脂肪醇乙氧基化物) | 1-10% |
碳酸钠(Na2CO3) | 8-25% |
可溶性硅酸(Na2O,2SiO2) | 5-15% |
沸石(NaAlSiO4) | 15-28% |
过硼酸钠(如NaBO3·4H2O) | 0-20% |
漂白激活剂(TAED或NOBS) | 0-5% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-3% |
(C12-C18)烷基硫酸盐 | 9-15% |
脂肪醇乙氧基化物 | 3-6% |
多羟基烷基脂肪酸酰胺 | 1-5% |
沸石(NaAlSiO4) | 10-20% |
层化的二硅酸盐(如来自HoechSt的SK56) | 10-20% |
碳酸钠(Na2CO3) | 3-12% |
可溶性硅酸盐(Na2O,2SiO2) | 0-6% |
柠檬酸钠 | 4-8% |
过硼酸钠 | 13-22% |
TAED | 3-8% |
聚合物(如聚羧酸盐和PVP=, | 0-5% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-5% |
(C12-C18)烷基硫酸盐 | 4-8% |
脂肪醇乙氧基化物 | 11-15% |
皂 | 1-4% |
沸石MAP或沸石A | 35-45% |
碳酸钠(Na2CO3) | 2-8% |
可溶性硅酸盐(Na2O,2SiO2) | 0-4% |
过硼酸钠 | 13-22% |
TAED | 1-8% |
羧甲基纤维素 | 0-3% |
聚合物(如聚羧酸盐和PVP) | 0-3% |
酶(按纯酶蛋白质计算) | 0.0001-0.1% |
微量成分(如顽固泡沫抑制剂,香料,荧光增白剂,光漂白剂) | 0-3% |
可以以在洗涤剂中常规使用的浓度掺入本发明的脂酶变异体。目前设想在本发明的洗涤剂组合物中以相当于(0.00001-1mg脂酶变异体/升洗涤液的量(按纯酶蛋白质计算)加入本发明的脂酶变异体。餐具洗涤组合物
餐具洗涤剂组合物含有可以是阴离子,非离子,阳离子,两性离子或这些类型的混合物的表面活性剂。所述洗涤剂含有0-90%的非离子表面活性剂如低-到无泡乙氧基化的丙氧基化的直链醇。
所述洗涤剂组合物可含有无机和/或有机洗涤剂助洗剂盐。可将所述洗涤剂助洗剂再分成含磷的和不含磷类。所述洗涤剂组合物通常含有1-90%的洗涤剂助洗剂。
现有的含磷无机碱性洗涤剂助洗剂的实例包括水溶性盐,特别是碱金属焦磷酸盐,正磷酸盐,多磷酸盐和磷酸盐。不含磷的无机助洗剂的实例有可溶性碱金属碳酸盐,硼酸盐和硅酸盐以及各种水不溶性结晶的或无定形的硅酸铝,其中已知的最有代表性的是沸石。
适宜的有机助洗剂的实例包括碱金属,铵和取代的铵,柠檬酸盐,琥珀酸盐,丙二酸盐,脂肪酸磺酸盐,羧基甲氧基琥珀酸盐,多乙酸铵,羧酸盐,聚羧酸盐,氨基聚羧酸盐,聚乙酰基羧酸盐和多羟基磺酸盐。
其他适宜的有机助洗剂包括已知的与助洗剂特性的高分子量聚合物和共聚物,例如适宜的聚丙烯酸,聚马来酸和聚丙烯酸/聚马来酸共聚物和其盐。
餐具洗涤剂组合物可含有氯/溴类或氧类的漂白剂。无机氯/溴类漂白剂的实例是次氯酸和次溴酸锂,钠或钙以及氯化的磷酸三钠。有机氯/溴类漂白剂的实例是杂环的N-溴和N-氯酰亚胺如三氯异氰脲酸,三溴异氰脲酸,二溴异氰脲酸和二氯异氰脲酸和其水溶性阳离子如钾和钠的盐。海因化合物也是适宜的。
例如,无机过盐形式的氧漂白剂是优选的,优选的是与一个漂白前体或作为过氧酸化合物。适宜过氧漂白化合物的典型实例是碱金属过硼酸盐、四水合物和单水合物,碱金属过碳酸盐、过硅酸盐和过磷酸盐。优选的活化物质是TAED和甘油三乙酸酯。
可以用用于酶的常规稳定剂,如多元醇如聚乙二醇,糖或糖醇,乳酸,硼酸或硼酸衍生物如芳香族硼酸酯来稳定本发明的餐具洗涤剂组合物。
餐具洗涤剂组合物还可含有其他酶,特别是淀粉酶,蛋白质和/或纤维素酶。
本发明餐具洗涤剂组合物还可含有其他常规洗涤剂成分,如抗絮凝剂材料,填充材料,抑泡剂,抗腐蚀剂,污垢悬浮剂,螯合剂,抗污垢再沉积剂,脱水剂,染料,杀菌剂,荧光剂(fluorescers),增厚剂和香料。
最后,可以在常规餐具洗涤剂如在下列专利出版物中描述的任何洗涤剂中使用本发明的变异体:EP551670,EP533239,WO9303129,EP507404,US5141664,GB2247025,EP414285,GB2234980,EP408278,GB2228945,GB2228944,EP387063,EP385521,EP373851,EP364260,EP349314,EP331370,EP318279,EP318204,GB2204319,EP266904,US5213706,EP530870,CA2006687,EP481547,EP337760,WO93/14183,US5223179,WO93/06202,WO93/05132,WO92/19707,WO92/09680,WO92/08777,WO92/06161,WO92/06157,WO92/06156,WO91/13959,EP399752,US4941988,US4908148。
此外,可在柔软剂组合物中使用本发明的脂酶变异体:如在Surfanctant and Consumei Products,Ed,by J.Falbe,1987,pp.295-296;Tenside Surfactants Detergents 30(1993),6,pp394-399;JAOCS,vol.61(1984),2,pp367-376;EP517762;EP123400;WO92/19714;WO93/19147;US5082578;EP494769;EP544493;EP543562;US5235082;EP568297;EP570237中描述的织物柔软剂中使用所述脂酶变异体。
在附图中还描述了本发明,在附图中图1是pYESHL的限制图谱,图2是质粒pAO1的限制图谱,图3是质粒pAHL的限制图谱,和图4和5表示编码本发明变异体的基因的构建。
本发明还在下列实施例中作了进一步的描述,所述实施例不以任何方式限制本发明权利要求的范围。材料和方法
可从Deutsche Sammlung von Mikroorganismen und ZellkulturenGmbH,Mascheroderweg 1b,D-3300,Braunschweig,Federal Republic ofGermany得到Humicola lanuginosa DSM4109。
pYESHL是酵母/大肠杆菌穿梭载体,在酵母中表达并分泌低水平的H.lanuginosa脂酶。更具体地说,pYESHL是pYES2(从InvitrogenCorp.,UK购得)的衍生物,其中切掉GAL1启动子,然后将Humicolalanuginosa脂酶基因和来自啤酒酵母的TPI(磷酸丙糖异构酶)启动子(Alber,T.and Kawasaki,g.,J.Mol.apl.Genet1,419-434(1982))克隆SphI和XbaI位点之间。在图1中列出了pYESHL的限制图谱。低钙过滤检测方法
1)提供在顶部带有第一蛋白质结合滤膜(尼龙膜)和第二低蛋白质结合滤膜(乙酸纤维素)的SC Ura-复制平皿(用于筛选携带表达载体的菌株)。
2)在双滤膜上涂覆含亲本脂酶基因或突变脂酶基因的酵母细胞,然后在30℃培养2或3天。
3)通过将顶层滤膜转移到新平皿上而将菌落保持在顶部滤膜上。
4)将蛋白质结合滤膜放到一空培养皿中。
5)将含有橄榄油乳液(2%P.V.A.∶橄榄油=3∶1),亮绿(指示剂,0.004%),100 mMTris缓冲液pH9和EGTA(终浓度为5mM)的琼脂糖溶液倒到底部的滤膜上以便鉴定为兰绿色点的表达脂酶活性的菌落。
6)鉴定步骤5)中的菌落与亲本脂酶相比是否对钙的依赖性降低。DobanolTM25-7滤膜检测:
利用与上述滤膜检测相对应的滤膜检测,所不同的是在5)中的溶液中还含有0.02%dobanolTM25-7,来筛选对洗涤剂组分是否有改善的耐受性。构建随机诱变的文库a) 使用完整的脂酶编码基因
用12M甲酸将质粒pYESHL在室温处理20分钟。在诱变条件下(0.5mM MnCl2和1/5正常量的ATP,参见Leung et al.,1989),用PCR从甲酸处理的质粒扩增所得的脂酶编码基因。
由于甲酸主要产生碱基颠换,而PCR产生的突变主要是碱基转换,所以,该处理主要是为了得到较宽范围的突变。
将所得的PCR片段通过体内双重组(Muhlrad et al.,1992)而克隆到穿梭载体中或借助消化和连接克隆到穿梭载体中,然后转化大肠杆菌。
将随机捡出的8个克隆测序,发现平均含有2-3个突变-碱基颠换和碱基转换。
利用所述方法制备了7个含有10000-140000个克隆的文库。b) 完成定位随机诱变
合成致诱变引物(寡核苷酸),所述引物除对应于待诱变氨基酸密码子的核苷酸外对应于待诱变DNA序列部分。
随后,在PCR中用所得的致诱变引物与适宜的相反引物反应。纯化并消化所得的PCR片段,然后将其克隆到穿梭载体中。另外,如果需要,可以在第二PCR反应中用所得的PCR片段为引物与适宜的第二相反引物反应,以便消化待诱变的区域并将其克隆到穿梭载体中。在正常条件下完成PCR反应。
用Biosystems ABI DNA测序仪373A型,按在ABI Dye TerminatorCycle Sequencing试剂盒中的方法完成DNA测序。实施例实施例1构建随机脂酶变异体
按上述材料和方法中的描述制备完整的H.lanuginosa脂酶基因和其氨基酸(aa)91-97和206-211的随机诱变的文库。
首先选氨基酸区域91-97和206-211进行第一轮定位诱变,原因是已经发现这些区域对于洗涤性能是很重要的。区域91-97是脂酶罩区域,而区域206-211组成了脂酶疏水缝隙。
针对各区域合成各自的寡核苷酸,它们分别含有93%的野生型核苷酸和2.33%在待诱变的氨基酸密码子上的其他三种核苷酸。在可能未改变氨基酸时,用50%G/50%C合成密码子中的第三个核苷酸(摆动碱基)以便使氨基酸的一个或两个密码子产生改变的可能性较大。区域91-97致诱变寡核苷酸的组成示于表1中。
利用所述的寡核苷酸,在该文库中,对于在亲本脂酶中导致一个氨基酸改变的理论突变频率约为65-70%。对于导致两个或多个氨基酸改变的突变频率低于35%。选择这种低突变频率来确保在阳性克隆中观察到的氨基酸改变与酶的改善有关,而高突变频率会产生“中性”改变。
在PCR反应中用所述致诱变引物与适宜的反引物反应。纯化所得的PCR片段,就区域206-211而论,将其消化并克隆到穿梭载体中。如果是区域91-97,在第二PCR反应中使用所得的PCR片段为引物与第二适宜的反引物反应。所述步骤对于消化被诱变的区域并将其克隆到穿梭载体中是必需的。
已经制备了含10000-80000个克隆/文库的区域91-97和区域206-211的文库。在亲本脂酶是阳性的,即表现出脂酶活性的条件下检测时,大多数菌落是阳性(大于90%)的。用滤膜检测时用2.5mMCa(代替5mMEGTA)确定阳性反应。
用上述材料和方法中描述的DobanolTM25-7和低钙检测从不同的文库中筛选450000个菌落。从91-97文库(罩区)分离25个低钙阳性克隆,从完整基因文库分离12个DobanolTM25-7阳性克隆。将来自aa91-97诱变的14个低钙阳性克隆测序。尽管对于PCR错掺入来说,S83T是很少见的一种碱基颠换,但仍可用PCR错掺入来解释在诱变区外的三种其他突变(在密码子83,103,145)。序列:
5′ 5 C G
T 5 C 3′
T 7 A
A 8 G 瓶 5:93% A;2.33% C;2.33% G和2.33% T
T 8 T
T A/C T
T 5 C
C 7 T
T 5 C 瓶 6:93% C;2.33% A;2.33% G和2.33% T
T 8 T
T 8 A
6 C/G T
5 6 G 瓶 7:93% G;2.33% A;2.33% C和2.33% T
5 6 G
7 G A
8 A A
6 T C 瓶 8:93% T;2.33% A;2.33% C和2.33% G
7表1:说明如何构建用于定位随机诱变LipolaseR的氨基酸91-97的寡核苷酸。序列中的数字是序列右边组合物的瓶号。
表2菌株号 变异体类型
59 I G91A N94K D96A
60 II S83T N94K D96N
61 II S83T N94K D96N
62 III E87K D96V
63 IV E87K G91A D96V
64 II S83T N94K D96N
65 III E87K D96V
67 V N94K F95L D96H
69 V N94K F95L D96H
71 III E87K D96V
72 II S83T N94K D96N表2:菌株号指最初捡出的克隆到曲霉表达载体pAHL中的克隆。变异体类型指在扩增随机诱变的文库时产生的相同克隆。变异体类I和II在0.001%DobanolTM25-7中是有活性的,但其余的像野生型一样无活性。
表3
DNA序列菌株号 变异体类型 在序列上的氨基酸号
82 83 84 85 86 87 88 89 90 91 92wt GGC TCT CGT TCC ATA GAG AAC TGG ATC GGG AAT59 I C60 II A C61 II A C62 III A C63 IV A C64 II A C65 III A C67 V C52/68 wt53 wt69 V C71 III A C72 II A C73 VI
93 94 95 96 97 98 99 100 -103 -145wt CTT AAC TTC GAC TTG AAA GAA ATA -ATT -CAT59 I G G C60 II G G A61 II G G A62 III T63 IV C C C64 II G G A65 III G T67 V A C A C52/68 wt53 wt69 V A C A C71 III G T72 II G A A73 VI A ?表3:在顶行列出了野生型序列。只写出了不同于野生型的变异体核苷酸。密码子91和93的碱基分别以1∶1的C/T和T/G掺和。而在密码子91-97的核苷酸使用93%的野生型和2.33%的三种其他核苷酸。实施例2
用与实施例1所述类似的方法,通过随机诱变构建下列变异体。还描述了用于筛选某些变异体的实际筛选标准。
D167G+E210V
5mM EGTA,0.01% DobanolTM25-7.0.006% LAS
E87K+G91A+L93I+N94K+D96A
5mM EGTA,0.02%DobanolTM25-7
N73D+S85T+E87K+G91A+N94K+D96A
S83T+E87K+W89G+G91A+N94K+D96V
E87K+G91A+D96R+I100V
S83T+E87K+Q249R
E87K+G91A实施例3在米曲霉中表达Humicola lanuginosa脂酶
在EP 305216中描述了Humicola lanuginosa脂酶的克隆。它还描述了脂酶在米曲霉中的表达和表征。所用的表达质粒被命名为p960。
在本申请中使用的表达质粒与p960相同,只是在脂酶编码区的3’端有很小的修饰。所述修饰用下列方法完成:用NruI和BamHI限制酶消化p960。在这两个位点之间克隆来自质粒pBR322的BamHI/NheI片段,其中用Klenow聚合酶补平NheI片段,由此得到质粒pA01(图2),所得的质粒含有特有的BamHI和NheI位点。克隆来自p960在这些特有位点间的BamHI/XbaI片段以得到pAHL(图3)。脂酶基因的体外定点诱变
在Nelson & Long,analytical Biochemistry,180,147-151(1989)中描述了将突变导入脂酶基因的方法。该方法包括用3步PCR(聚合酶链反应)产生含有所需突变的片段,所述突变是通过在PCR反应中使用化学合成的DNA链为模板而导入的。从PCR产生的片段中,可以用限制酶裂解分离携带所述突变的DNA片段,然后再插入到所述表达质粒中。在实施例5中完整地描述了所述方法。在图4和5中进一步概括了该方法。构建表达Humicola lanuginosa脂酶的N94K/D96A类似物的质粒质粒pAHL的线性化
用限制酶SphI在50μl下列反应混合物中将环状质粒pAHL线性化:50mM NaCl,10mM Tris-HCl,pH7.9,10mM MgCl2,1mM二硫苏糖醇,1μg质粒和2单位SphI。在37℃消化2小时。用酚(用Tris-HCl平衡的,pH7.5)抽提反应混合物,然后通过加入2体积的冰冷96%乙醇来沉淀。离心和干燥沉淀后,将线性化的DNA溶解在50μl水中,在琼脂糖凝胶上估算浓度。3步PCR诱变
如图5所示,3步诱变使用四种引物:
诱变引物 (=A): 5’-TATTTCTTTCAAAGCGAACTTAAGATTC-
CCGAT-3’PCR 辅助物 1 (=B): 5’-GGTCATCCAGTCACTGAGACCCTCTACCTATTAA-
ATCGGC-3’PCR 辅助物 2 (=C): 5’-CCATGGCTTTCACGGTGTCT-3’PCR Handle (=D): 5’-GGTCATCCAGTCACTGAGAC-3’
辅助引物1和2与编码区外的序列互补,因此在构建变异体序列时可用其与任何诱变引物相结合。
所有3个步骤均在下列缓冲液中完成:10mM Tris-HCl,pH8.3,50mM KCl,1.5mM MgCl2,0.001%明胶,0.2mM dATP,0.2mMdCTP,0.2mM GTP,0.2mM TTP,2.5单位的Taq聚合酶。
在步骤1中,将100pmol引物A,100pmol引物B和1fmol线性化的质粒加到共100μl的反应混合物中,完成15个循环,每个循环包括95℃2分钟,37℃2分钟,72℃3分钟。
在琼脂糖凝胶上估算PCR产物的浓度。然后完成步骤2。在前述100μl的缓冲液中含0.6pmol步骤1的产物和1fmol线性化质粒,完成1个循环,该循环包括在95℃5分钟,37℃2分钟,72℃10分钟。
向步骤2的反应混合物中加入100pmol引物C和100pmol引物D(各1μl),完成20个循环,每循环包括95℃2分钟,37℃2分钟,72℃3分钟。本操作过程包括了诱变方法中的步骤3。分离突变的限制片段
从琼脂糖凝胶中分离步骤3的产物,然后再溶在20μl水中。接着在共50μl含下列组分的混合物中用限制酶BamHI和BstXI将其消化:100mM NaCl,50mM Tris-HCl,pH7.9,10mM MgCl2,1mM DTT,10单位BamHI和10单位BstXI。在37℃保温2小时。从琼脂糖凝胶中分离733bp的BamHI/BstXI片段。与表达载体pAHL相连
在上述条件下用BamHI和BstXI裂解表达载体pAHL,从琼脂糖凝胶中分离较大的片段。将所述分离的突变片段与该载体相连,然后用连接混合物转化大肠杆菌。通过用限制酶裂解从转化体制备的质粒米确定所述片段的存在和方向。用DyeDeoxyTM Terminater Cycle Sequencing试剂盒(Applied Biosystems)在ABI DNA测序仪,373A型上对双链质粒进行序列分析。将所述质粒命名为pAHLG91A/N94K/D96A,除取代的密码子外,该质粒与pAHL相同。实施例4构建表达其他Humicola脂酶变异体的质粒
用与实施例3中所述相同的方法构建下列变异体。下面列出了用于修饰的质粒名称和引物。质粒名称 引物A序列pAHLS83T/N94K/D96A 5′-ATTTCTTTCAAAGCGAACTTAAGATTCCCGA-
TCCAGTTCTCTATGGAACGAGTGCCACGGAAAGA-3’pAHLE87K/D96V 5-TATTTCTTTCAAAACGAAGTTAAGATTCCCGATCC-
AGTTCTTTATGGAACGAGA-3’pAHLE87K/G91A/D96A 5′-TATTTCTTTCAAAGCGAAGTTAAGATTAGCGATC-
CAGTTCTTTATGGAACGAGA-3’pAHLN94K/F95L/D96H 5’-TATTTCTTTCAAGTGCAACTTAAGATTCCCGAT-3’pAHLF95C/D96N 5’-TATTTCTTTCAAGTTACAGTTAAGATTCCC-3’pAHLG91S/L93V/F95C 5′-TATTTCTTTCAAGTCACAGTTAACATTAGAGATCC-
AGTTCTC-3’pAHLE87K/G91A/L93I/N94K/D96A
5′-TATTTCTTTCAAAGCGAACTTAATATTAGCGATC-
CAAGTTCTTTATGGAACGAGA-3’pAHLD167G 5’-ATATGAAAACACACCGATATCATACCC-3’pAHLA121V 5’-CCTTAACGTATCAACTACAGACCTCCA-3’pAHLR205K/E210Q 5’-GCTGTAACCGAATTGGCGCGGCGGGAGCTTAGGG-
ACAATATC-3’pAHLN73D/S85T/E87K/G91A/N94K/D96A
5’-TATTTCTTTCAAAGCGAACTTAAGATTAGCGATC-
CAGTTCTTTATAGTACGAGAGCCACGGAA-
AGAGAGGACGATCAATTTGTCCGTGTTGTCGAG-3’pAHLS83T/E87K/W89G/G91A/N94K/D96V
5’-TATTTCTTTCAAAACGAACTTAAGATTAGCGATA-
CCGTTCTTTATGGAACGAGTGCCACGGAAAGA-3’pAHLE87K/G91A/D96R/I100V
5’-GCAAATGTCATTAACTTCTTTCAATCTGAAGTTAA-
GATTAGCGATCCAGTTCTTTATGGAACGAGA-3’pAHLS83T/E87K 5’-CCCGATCCAGTTCTTTATGGAACGAGTGCCACGG-
AAAGA-3’pAHLE87K/G91A 5’-GAAGTTAAGATTAGCGATCCAGTTCTTTATGGAA-
CGAGA-3’pAHLS83T/E87K 5’-CCCGATCCAGTTCTTTATGGAACGAGTGCCACGG-
AAAGA-3’pAHLQ249R 5’-CGGAATGTTAGGTCTGTTATTGCCGCC-3’实施例5构建表达Hamicola脂酶组合类似物的质粒
用适宜的引物,通过两个连续的诱变步骤来构建制质粒pAHLD167G/E210V,pAHLA121V/R205K/E210Q和pAHLS83T/E87K/Q249R。实施例6在曲霉中表达脂酶类似物米曲霉的转化(一般方法)
用米曲霉孢子接种100ml YPD(Sherman et al.,Methods in YeastGenetics,Cold Spring Harbor Laboratory,1981),然后振荡培养24小时。通过miracloth过滤收集菌丝体,用200ml 0.6M MgSO4洗涤。将菌丝体悬浮在15ml 1.2M MgSO4,pH5.8中。在冰上冷却悬浮液,加入1ml含120NovozymR234,批号1687。5分钟后,加入1ml 12/mlBSA(Sigma型H25),在37℃缓慢搅拌继续培养1.5-2.5小时,直到在显微镜下检测的样品中可见到大量的原生质体。
通过miracloth过滤悬浮液,将滤物转移到无菌试管中,用5ml 0.6M山梨醇,100mM Tris-HCl,pH7.0覆盖。以1000g离心15分钟,从MgSO4层顶收集原生质体。将2体积的STC(1.2M山梨醇,10mM Tris-HCl,pH=7.5,10mM CaCl)加到原生质体悬浮液中,然后将混合物以1000g离心5分钟。将原生质体沉淀悬浮在3ml SRC中,然后再沉淀。重复该过程。最后,将原生质体重新悬浮在0.2-1ml STC中。
将100μl原生质体悬浮液与10μl STC中的5-25μg p3SR2(在Hynes et al. Mol.and Cel.biol.,Vol.3,No.8,1430-1439,Aug.1983中描述的携带构巢曲霉amdS基因的质粒)混合。将混合物在室温放置25分钟。加入0.2ml 60%PEG 4000(BDH 29576),10mM CaCl2和10mMTris-HCl,pH7.5,小心混合(两次),最后加入0.85ml相同的溶液并仔细混合。将混合物在室温放25分钟,以2500g离心15分钟,然后将沉淀重悬的2ml1.2 M山梨醇中。沉淀一次以上后,将原生质体铺在含1.0M蔗糖,pH=7.0,10mM乙酰胺为氮源和20mM CsCl的基本平皿(Cove,Biochem.Biophys.Acta 113(1966)51-56)上以抑制背景生长。在37℃培养4-7天后,捡出孢子,悬浮在无菌水中,涂覆以定点单个菌落。重复所述过程,贮存第二次分离后的单个菌落的孢子作为确定的转化体。在米曲霉中表达脂酶类似物
将上述质粒通过与p3SR2共转化而转化到米曲霉IFO 4177中,所述p3SR2含有在上述实施例中描述的来自构巢曲霉的amdS基因。将上述制备的原生质体与等量的表达质粒和p3SR2一起培养,两种质粒各使用约5μg。两次分离可以用乙酰胺为唯一氮源的转化体。在YPD上生长3天后,用有关脂酶活性的检测方法分析培养物上清液。选择最好的转化体进行进一步的研究,使其在1升烧瓶中的200mlFG4培养基(3%豆糜,3%麦芽糊精,1%胨,用4MNaOH将pH调到4)上于30℃生长4天。实施例7纯化本发明的脂酶变异体脂酶活性的检测:
用阿拉伯树胶为乳化剂,通过乳化甘油三丁酸酯来制备脂酶底物。
用pHstat方法,在pH7检测脂酶活性。将1单位脂酶活性(LU/mg)定义为每分钟释放1微摩尔正方形所需的量。
步骤1:离心发酵上清液,丢弃沉淀。将所述上清液的ph条到7,逐渐加入等体积的冷96%乙醇。将混合物在冰浴中保持30分钟。离心并去掉沉淀。
步骤:2离心交换层析。过滤上清液并将其用在用50mM tris-HCl缓冲液,pH7平衡的DEAE-快速(Pharmacia TM)柱。用相同的缓冲液洗涤所述柱,直到在280nm的吸收值磁于0.05OD。用5个柱体积的相同缓冲液中的线性盐梯度(0-0.5M NaCl)洗脱结合的酶活性。收集含酶活性的组分。
步骤3:疏水层析。通过加入固体乙酸胺将含酶活性的收集物的体积摩尔浓度调到0.8M。将所述酶用在预先用0.8M乙酸胺平衡的TSK凝胶Butyl-Toyopearl 650C柱(可从Tosoh Corporation Japan购买)。用0.8M乙酸胺洗涤未结合的物质,用蒸馏水洗脱结合的物质。
步骤4:用水稀释含酶活性的收集物,以便将电导调到2mS,将pH调到7。将收集物用所预先用50mM tris-乙酸缓冲液pH7平衡的HighPerformance Q Sepharose(Pharmacia)柱。用盐线性梯度洗脱结合的酶。实施例8本发明脂酶变异体的洗涤性能
与野生型H.lanudinosa脂酶相比以每升蛋白质mg计的酶量根据OD280计算本发明humicola lanuginosa脂酶变异体的洗涤性能。
在放在150ml烧杯的热稳定的水浴中完成洗涤试验。用三角形磁棒搅拌烧杯。
试验条件如下:
方法: 3个循环,各循环间过夜干燥
洗涤液: 每烧杯100ml
布样: 每烧杯6个布样(3.5×3.5cm)
织物: 100%棉,Test Fabrics style#400
污垢: 用苏丹红染的猪脂(0.75mg染料/g猪脂)。将6μl加热到70℃的猪脂放每块布的中心。产生污点后,将布在75℃于烤箱中加热30分钟。然后在第一次洗涤前于室温将布过夜贮存。
洗涤剂:LAS(Nansa 1169/P,30%a.m.) 1.17g/l
AEO(DobanolTM 25-7) 0.15g/l
三磷酸钠 1.25g/l
硫酸钠 1.00g/l
碳酸钠 0.45g/l
硅酸钠 0.15g/l
pH: 10.2
脂酶浓度:每升脂酶蛋白质0.075,0.188,0.375,0.75和0.25mg
时间: 20分钟
温度: 30℃
漂洗: 流动的自来水中15分钟
干燥: 室温过夜(-20℃,30-50%RH)
评价: 第3次洗涤后,测量在460nm的反射度。结果
比较脂酶变异体和天然H.lanuginosa脂酶的剂量反应曲线。将测量值代到下列方程中而计算剂量反应曲线: 其中 ΔR是用反射度单位表示的效果,C是酶浓度(mg/l)ΔRmax是表示最大效果的常数K是常数;K2表示得到最大效果的一半时的酶浓度。
以各脂酶变异体和野生型脂酶的特征常数ΔRmax和K为基础,计算改善因子。改善因子的定义如下:
fimprovc=CWT/C (II)表示得到与用0.25mg/l参考野生型蛋白质(CWT)相同的效果所需的脂酶变异体蛋白质的量。
因此,计算改善因子的方法如下:1) 用方程(I)计算0.25mg/l野生型蛋白质的效果(ΔR野生型);2) 用下列方程计算与0.25mg/l野生型效果相同的脂酶变异体的浓度: 3) 用方程(II)计算改善因子。结果列在下列表1中。
表1
参考文献:Muhlrad et al.,1992;Yeast,Vol.8,79-82Shimada,Y.et al.(1989).cDNA Molecular Cloning of Geotrichumcandidum Lipase.J.Biochem.,106,383-388.Yamaguchi,S.et al.(1991).Cloning and structure of the mono-and diglycerol lipase-encoding gene from Penicilliumcamembertii U-150.Gene 103,61-67.Hass,M.J.et al.(1991).Cloning,expression andcharacterization of a cDNA encoding a lipase from Rhizopusdelemar.Gene 109,107-113.Kugimiya,W.et al.(1992).Cloning and Sequences Analysis ofDNA encoding Rhizopus niveus Lipase.Biosci.Boitech.Biochem.56,716-719.Dartois,V.et al.(1993).Cloning,nucleotide sequence andexpression in Escherichia coli of a lipase gene from Bacillussubtilis 168.Biochemica et Biophysica acta 1131,253-260.Sambrook et al.Molecular Cloning:A Laboratory Manual,2ndEd.,Cold Spring Harbor,1989.R.K.Saiki et al.,Science 239,pp.487-491,1988.Beaucage and Caruthers,Tetrahedron Letters 22,pp.1859-1869,1981.Matthes et al.,The EMBO J.3,pp.801-805,1984.J.O.Deshler,(1992) A simple method for randomly mutatingcloned DNA fragments by using chemical mutagens and thepolymerase chain reaction.GATA 9(4):103-106Leung et al.,Technique,Vol.1,No.1,pp.11-15,1989Fowler et al.,Molec.gen.Genet.,133,pp.179-191,1974.Brady et al.,“A Serine Protease Triad Forms the CatalyticCentre of a Triacylglycerol Lipase”,Nature 343,1990,pp.767-770,1990.Tilbeyrgh,H.Van,Egloff,M.-P.,Martinez,C.,Rugani,N.,Verger,R.and Cambillau(1993)Nature 362,p.814-820.Interfacial activation of the liPase-Prolipase complex by mixedmicelles revealed by X-ray crystallography.Hudson et al.,Practical Immunology,Third edition,BlackwellScientific Publications,1989Alber,T.and Kawasaki,G.,J.Mol.Appl.Genet 1,419-434(1982)序列表(1)一般信息:(略)(2)SEQ ID No:1的信息:
变异体 | 改善因子 |
E87K+D96V | 1.2 |
S83T+N94K+D96N | 2.3 |
N94K+D96A | 2.7 |
E87K+G91A+D96A | 2.6 |
N94K+F95L+D96H | 3.3 |
D167G+E210V | 5.0 |
E87K+G91A+L93I+N94K+D96A | 1.3 |
E87K+G91A+D96R+I100V | 5.2 |
E87K+G91A | 5.0 |
N73D+E87K+G91A+N94I+D96G | 1.3 |
S83T+E87K+G91A+N92H+N94K+D96M | 3.8 |
K46R+E56R+G61S | 1.9 |
D102K | 0.2 |
D167G | 1 |
N73D+E87K+G91A+N94I+D96G | 1.3 |
E210R | 2.7 |
E210K | 5.5 |
E210W | 1 |
N251W+D254W+T267W | 0.8 |
S83T+E87K+G91A+N92H+N94K+D96M | 3.8 |
E56R+I90F+D96L+E99K | 4.8 |
D57G+N94K+D96L+L97M | 1.9 |
(i)序列特征
(A)长度:918个碱基对
(B)类型:核酸
(C)链度:单链
(D)拓扑结构:线性
(ii)分子类型:cDNA
(vi)一原始来源
(A)生物:Humicola lanuginosa
(ix)特征:
(A)名称/关键词:CDS
(B)位置 :1..873
(C)名称/关键词:mat_肽
(D)位置 :67..873
(xi)序列描述:SEQ ID NO:1:ATG AGG AGC TCC CTT GTG CTG TTC TTT GTC TCT GCG TGG ACG GCC TTG 48Met Arg Ser Ser Leu Val Leu Phe Phe Val Ser Ala Trp Thr Ala Leu
-20 -15 -10GCC AGT CCT ATT CGT CGA GAG GTC TCG CAG GAT CTG TTT AAC CAG TTC 96Ala Ser Pro Ile Arg Arg Glu Val Ser Gln Asp Leu Phe Asn Gln Phe
-5 1 5 10AAT CTC TTT GCA CAG TAT TCT GCA GCC GCA TAC TGC GGA AAA AAC AAT 144Asn Leu Phe Ala Gln Tyr Ser Ala Ala Ala Tyr Cys Gly Lys Asn Asn
15 20 25GAT GCC CCA GCT GGT ACA AAC ATT ACG TGC ACG GGA AAT GCC TGC CCC 192Asp Ala Pro Ala Gly Thr Asn Ile Thr Cys Thr Gly Asn Ala Cys Pro
30 35 40GAG GTA GAG AAG GCG GAT GCA ACG TTT CTC TAC TCG TTT GAA GAC TCT 240Glu Val Glu Lys Ala Asp Ala Thr Phe Leu Tyr Ser Phe Glu Asp Ser
45 50 55GGA GTG GGC GAT GTC ACC GGC TTC CTT GCT CTC GAC AAC ACG AAC AAA 288Gly Val Gly Asp Val Thr Gly Phe Leu Ala Leu Asp Asn Thr Asn Lys
60 65 70TTG ATC GTC CTC TCT TTC CGT GGC TCT CGT TCC ATA GAG AAC TGG ATC 336Leu Ile Val Leu Ser Phe Arg Gly Ser Arg Ser Ile Glu Asn Trp Ile75 80 85 90GGG AAT CTT AAC TTC GAC TTG AAA GAA ATA AAT GAC ATT TGC TCC GGC 384Gly Asn Leu Asn Phe Asp Leu Lys Glu Ile Asn Asp Ile Cys Ser Gly
95 100 105TGC AGG GGA CAT GAC GGC TTC ACT TCG TCC TGG AGG TCT GTA GCC GAT 432Cys Arg Gly His Asp Gly Phe Thr Ser Ser Trp Arg Ser Val Ala Asp
110 115 120ACG TTA AGG CAG AAG GTG GAG GAT GCT GTG AGG GAG CAT CCC GAC TAT 480Thr Leu Arg Gln Lys Val Glu Asp Ala Val Arg Glu His Pro Asp Tyr
125 130 135CGC GTG GTG TTT ACC GGA CAT AGC TTG GGT GGT GCA TTG GCA ACT GTT 528Arg Val Val Phe Thr Gly His Ser Leu Gly Gly Ala Leu Ala Thr Val
140 145 150GCC GGA GCA GAC CTG CGT GGA AAT GGG TAT GAT ATC GAC GTG TTT TCA 576Ala Gly Ala Asp Leu Arg Gly Asn Gly Tyr Asp Ile Asp Val Phe Ser155 160 165 170TAT GGC GCC CCC CGA GTC GGA AAC AGG GCT TTT GCA GAA TTC CTG ACC 624Tyr Gly Ala Pro Arg Val Gly Asn Arg Ala Phe Ala Glu Phe Leu Thr
175 180 185GTA CAG ACC GGC GGA ACA CTC TAC CGC ATT ACC CAC ACC AAT GAT ATT 672Val Gln Thr Gly Gly Thr Leu Tyr Arg Ile Thr His Thr Asn Asp Ile
190 195 200GTC CCT AGA CTC CCG CCG CGC GAA TTC GGT TAC AGC CAT TCT AGC CCA 720Val Pro Arg Leu Pro Pro Arg Glu Phe Gly Tyr Ser His Ser Ser Pro
205 210 215GAG TAC TGG ATC AAA TCT GGA ACC CTT GTC CCC GTC ACC CGA AAC GAT 768Glu Tyr Trp Ile Lys Ser Gly Thr Leu Val Pro Val Thr Arg Asn Asp
220 225 230ATC GTG AAG ATA GAA GGC ATC GAT GCC ACC GGC GGC AAT AAC CAG CCT 816Ile Val Lys Ile Glu Gly Ile Asp Ala Thr Gly Gly Asn Asn Gln Pro235 240 245 250AAC ATT CCG GAT ATC CCT GCG CAC CTA TGG TAC TTC GGG TTA ATT GGG 864Asn Ile Pro Asp Ile Pro Ala His Leu Trp Tyr Phe Gly Leu Ile Gly
255 260 265ACA TGT CTT TAGTGGCCGG CGCGGCTGGG TCCGACTCTA GCGAGCTCGA GATCT 918Thr Cys Leu(2)SEQ NO:2的信息
(i)序列特征
(A)长度:291个氨基酸
(B)类型:氨基酸
(D)拓扑结构:线性
(ii)分子类型:蛋白酸
(xi)序列描述:SEQ ID NO:2:Met Arg Ser Ser Leu Val Leu Phe Phe Val Ser Ala Trp Thr Ala Leu
-20 -15 -10Ala Ser Pro Ile Arg Arg Glu Val Ser Gln Asp Leu Phe Asn Gln Phe
-5 1 5 10Asn Leu Phe Ala Gln Tyr Ser Ala Ala Ala Tyr Cys Gly Lys Asn Asn
15 20 25Asp Ala Pro Ala Gly Thr Asn Ile Thr Cys Thr Gly Asn Ala Cys Pro
30 35 40Glu Val Glu Lys Ala Asp Ala Thr Phe Leu Tyr Ser Phe Glu Asp Ser
45 50 55Gly Val Gly Asp Val Thr Gly Phe Leu Ala Leu Asp Asn Thr Asn Lys
60 65 70Leu Ile Val Leu Ser Phe Arg Gly Ser Arg Ser Ile Glu Asn Trp Ile75 80 85 90Gly Asn Leu Asn Phe Asp Leu Lys Glu Ile Asn Asp Ile Cys Ser Gly
95 100 105Cys Arg Gly His Asp Gly Phe Thr Ser Ser Trp Arg Ser Val Ala Asp
110 115 120Thr Leu Arg Gln Lys Val Glu Asp Ala Val Arg Glu His Pro Asp Tyr
125 130 135Arg Val Val Phe Thr Gly His ser Leu Gly Gly Ala Leu Ala Thr Val
140 145 150Ala Gly Ala Asp Leu Arg Gly Asn Gly Tyr Asp Ile Asp Val Phe Ser155 160 165 170Tyr Gly Ala Pro Arg Val Gly Asn Arg Ala Phe Ala Glu Phe Leu Thr
175 180 185Val Gln Thr Gly Gly Thr Leu Tyr Arg Ile Thr His Thr Asn Asp Ile
190 195 200Val Pro Arg Leu Pro Pro Arg Glu Phe Gly Tyr Ser His Ser Ser Pro
205 210 215Glu Tyr Trp Ile Lys Ser Gly Thr Leu Val Pro Val Thr Arg Asn Asp
220 225 230Ile Val Lys Ile Glu Gly Ile Asp Ala Thr Gly Gly Asn Asn Gln Pro235 240 245 250Asn Ile Pro Asp Ile Pro Ala His Leu Trp Tyr Phe Gly Leu Ile Gly
255 260 265Thr Cys Leu
Claims (46)
1 制备亲本脂解酶变异体的方法,所述方法包括(a) 对编码亲本脂解酶的DNA序列进行随机诱变,(b) 在宿主细胞中表达步骤(a)中得到的突变DNA序列,和(c) 筛选表达突变脂解酶的宿主细胞,所述突变脂解酶与亲本脂解酶相比对钙的依赖性降低和/或对洗涤剂或洗涤剂组分的耐受性提高。
2 根据权利要求1的方法,其中用物理或化学诱变剂,使用寡核苷酸或PCR产生的诱变来完成所述随机诱变。
3 根据权利要求2的方法,其中所述诱变剂选自甲酸,UV辐射,羟胺,N-甲基-N’-硝基-N-亚硝基胍(MNNG),O-甲基羟胺,硝酸,甲烷磺酸乙酯(EMS),亚硫酸氢钠和核苷酸类似物。
4 根据权利要求1的方法,其中通过用突变DNA序列转化适宜的宿主细胞来完成所述突变DNA序列的表达,所述突变的DNA序列还可含有编码允许突变DNA序列表达的功能因子的DNA序列,然后在适宜表达突变DNA序列的条件下培养在步骤(b)中得到的宿主细胞。
5 根据权利要求1的方法,其中用于表达突变DNA序列的宿主细胞是微生物细胞。
6 根据权利要求5的方法,其中所述宿主细胞是真菌或细菌菌株的细胞。
7 根据权利要求6的方法,其中所述宿主细胞是真菌曲霉属,如黑曲霉,米曲霉和构巢曲霉的细胞,或糖酵母属,如啤酒酵母细胞。
8 根据权利要求6的方法,其中所述宿主细胞是革兰氏阳性菌如枯草芽孢杆菌,地衣形芽孢杆菌,缓慢芽孢杆菌,短小芽孢杆菌,嗜热脂肪芽孢杆菌,嗜碱芽孢杆菌,解淀粉芽孢杆菌,凝结芽孢杆菌,环状芽孢杆菌,Bacillus lautus,苏云金芽孢杆菌或变青链霉菌或鼠灰链霉菌的细胞,或革兰氏阴性菌如大肠杆菌的细胞。
9 根据权利要求1的方法,其中所述突变脂解酶对非离子,阴离子,阳离子,或两性表面活性剂的耐受性提高。
10 根据权利要求9的方法,其中所述非离子表面活性剂是脂肪醇乙氧基化物和/或阴离子表面活性剂是LAS或烷基硫酸盐。
11 根据权利要求1的方法,其中对在步骤(c)中筛选的宿主细胞进行第二次诱变处理,再筛选,再分离和/或再克隆。
12 根据权利要求1-11的任一方法,其中将随机诱变定位在编码亲本脂解酶的DNA序列的部分上。
13 根据权利要求1-12的任一方法,其中所述亲本脂解酶是脂酶,酯酶,角质酶或磷脂酶。
14 根据权利要求12或13的方法,其中亲本脂解酶是酯酶并且在编码亲本酯酶的脂接触区或其部分完成定位随机诱变。
15 根据权利要求14的方法,其中在编码亲本酯酶的罩区域和/或疏水缝隙或所述罩区域和/或疏水结合缝隙的部分上完成定位随机诱变。
16 根据权利要求1-13的任一方法,其中所述亲本脂解酶从微生物中得到。
17 根据根据权利要求18的方法,其中所述亲本脂解酶从真菌中得到。
18 根据权利要求17的方法,其中编码亲本脂解酶的DNA序列从腐质霉属,Rhizomucor属,根霉属,假丝酵母属的菌株得到。
19 根据权利要求18的方法,其中所述亲本脂解酶是脂酶,且编码亲本脂酶的DNA序列是从H.lanuginosa,如H.lanuginosa菌株DSM4109,Rh.mucor的菌株或Cantarctica菌株得到。
20 根据权利要求19的方法,其中经随机诱变的DNA序列编码至少一个由DSM4109的H.lanuginosa脂酶的氨基酸残基21-27,56-64,81-99,108-116,145-147,174,202-213,226-227,246-259或263-269所限定的区域之一。
21 根据权利要求20的方法,其中在所述区域的至少两个中完成定位随机诱变。
22 根据权利要求16的方法,其中所述亲本脂解酶可从细菌中得到。
23 根据权利要求22的方法,其中编码所述亲本脂解酶的DNA序列可从假单孢菌属,如葱头假单孢菌,产碱假单孢菌,类产碱假单孢菌或莓实假单孢菌的菌株,或芽孢杆菌的菌株中得到。
24 用权利要求1-23的任一方法制备的脂解酶变异体。
25 根据权利要求24的变异体是从DSM4109得到的H.lanuginosa脂酶变异体或其类似物,在至少一个下列位置上含有突变:K46,E56,S58,G61,T64,N73,S83,I90,G91,N92,N94,D96,L97,K98,E99,I100,D102,A121,E129,D167,R205,E210,K237,N251,I252,D254,P256,G263,L264 or T267。
26 从DSM4109菌株得到的H.lanuginosa脂酶变异体或其类似物,在由氨基酸残基56-64,83-100或205-211所限定的至少一个区域中带有突变。
27 根据权利要求26的变异体,含有至少下列突变之一:K46R,D57G,S58F,G61S,D62C,T64R,S83T,I90F,G91A,N92H,N94I,N94K,L97M,K98I,I100V,D102K,A121V,E129K,D167G,R205K,E210W,K237M,N259W,I252L,D254W,P256T,G263A,L264Q or T267W。
28 从DSM4109菌株得到的H.lanuginosa脂酶变异体或其类似物含有至少一个下列突变:N94K+D96AS83T+N94K+D96NE87K+D96VE87K+G91A+D96AN94K+F95L+D96HA121V+R205K+E210QF95C+D96NG91S+L93V+F95CE87K+G91A+D96R+I100VE87K+G91AS83T+E87K+Q249RS83T+E87K+W89G+G91A+N94K+D96VN73D+S85T+E87K+G91A+N94K+D94AE87K+G91A+L93I+N94K+D96AD167G+E210V N73D+E87K+G91A+N94I+D96GS83T+E87K+G91A+N92H+N94K+D96ME210WE56T+D57L+I90F+D96L+E99KE56R+D57L+V60M+D62N+S83T+D96P+D102ED57G+N94K+K96L+L97ME87K+G91A+D96R+I100V+E129K+K237M+I252L+P256T+G263A+L264QE56R+D57G+S58F+D62C+T64R+E87G+G91A+F95L+D96P+K98I+K237MK46R,E56R,G61SD102KD167GN73D+E87K+G91A+N94I+D96GE210VE210WN251W+D254W+T267WS83T+E87K+G91A+N92H+N94K+D96ME56R+I90F+D96L+E99KD57G+N94K+D96L+L97M。
29 含有编码脂解酶变异体的突变DNA序列的DNA构建体,所述变异体与亲本脂解酶相比对钙的依赖性降低和/或对洗涤剂或洗涤剂组分的耐受性提高,所述DNA序列是从权利要求1-23任一方法的步骤(c)中所筛选的宿主细胞中分离的。
30 编码权利要求24-28的任一权利要求H.lanuginosa脂酶变异体的DNA构建体。
31 含有权利要求29或30的DNA构建体的载体。
32 根据权利要求31的载体,它是质粒或噬菌体。
33 根据权利要求31或32的载体,它是还含有允许亲本脂解酶的变异体表达的DNA序列的表达载体。
34 含有权利要求29或30的DNA构建体或31-33任一载体的的宿主细胞。
35 根据权利要求34的细胞,它是微生物细胞。
36 根据权利要求35的细胞,它是真菌或细菌菌株的细胞。
37 根据权利要求36的细胞,是曲霉属,如黑曲霉,米曲霉和构巢曲霉的细胞或糖酵母属如啤酒酵母的细胞。
38 根据权利要求36的细胞,它是革兰氏阳性菌如枯草芽孢杆菌,地衣形芽孢杆菌,缓慢芽孢杆菌,短小芽孢杆菌,嗜热脂肪芽孢杆菌,嗜碱芽孢杆菌,解淀粉芽孢杆菌,凝结芽孢杆菌,环状芽孢杆菌,Bacillus lautus,苏云金芽孢杆菌或变青链霉菌或鼠灰链霉菌的细胞,或革兰氏阴性菌如大肠杆菌的细胞。
39 生产亲本脂解酶变异体的方法,所述变异体对钙的依赖性降低和/或对洗涤剂或洗涤剂组分的耐受性提高,所述方法包括根据权利要求1-23的任一方法制备变异体脂解酶,然后从步骤(c)筛选的宿主细胞中回收脂解酶变异体。
40 生产亲本脂解酶变异体的方法,所述变异体对钙的依赖性降低和/或对洗涤剂或洗涤剂组分的耐受性提高,所述方法包括在适宜于表达所述变异体的条件下培养权利要求34-38的任一宿主细胞,然后从培养物中回收脂解酶变异体。
41 用权利要求39或40的方法生产的脂解酶变异体。
42 含有权利要求24-28或41的脂解酶变异体的洗涤剂添加剂,可以是无粉尘颗粒或稳定的液体或被保护的酶形式。
43 根据权利要求42的洗涤剂添加剂,含有0.02-200mg酶蛋白/g添加剂。
44 根据权利要求42或43的洗涤剂添加剂还含有另一种酶,如蛋白酶,淀粉酶,过氧化物酶,角质酶脂酶/或纤维素酶。
45 含有权利要求24-28或41任一脂解酶变异体的洗涤剂组合物。
46 根据权利要求45的洗涤剂组合物还含有另一种酶,如蛋白酶,淀粉酶,过氧化物酶,角质酶,脂酶和/或纤维素酶。
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US4600693A (en) * | 1984-02-13 | 1986-07-15 | Corning Glass Works | Thermostable alpha amylase having a low requirement for calcium ions, derived from a bacillus microorganism |
ES2121786T3 (es) * | 1990-09-13 | 1998-12-16 | Novo Nordisk As | Variantes de lipasa. |
EP0525610A3 (en) * | 1991-07-27 | 1993-03-24 | Solvay Enzymes Gmbh & Co. Kg | Process for increasing the stability of enzymes and stabilized enzymes |
EP0802981A1 (en) * | 1992-12-23 | 1997-10-29 | Unilever N.V. | Modified cutinases, dna, vector and host |
CA2138519C (en) * | 1993-04-27 | 2007-06-12 | Jan Metske Van Der Laan | New lipase variants for use in detergent applications |
-
1995
- 1995-02-22 AU AU18067/95A patent/AU1806795A/en not_active Abandoned
- 1995-02-22 BR BR9506861A patent/BR9506861A/pt not_active Application Discontinuation
- 1995-02-22 CN CN95192164A patent/CN1077598C/zh not_active Expired - Lifetime
- 1995-02-22 EP EP95909666A patent/EP0746618B1/en not_active Expired - Lifetime
- 1995-02-22 CA CA002183431A patent/CA2183431A1/en not_active Abandoned
- 1995-02-22 JP JP52152595A patent/JP3553958B2/ja not_active Expired - Lifetime
- 1995-02-22 AT AT95909666T patent/ATE222604T1/de not_active IP Right Cessation
- 1995-02-22 WO PCT/DK1995/000079 patent/WO1995022615A1/en active IP Right Grant
- 1995-02-22 KR KR1019960704602A patent/KR970701264A/ko not_active Application Discontinuation
- 1995-02-22 DE DE69527835T patent/DE69527835T2/de not_active Expired - Lifetime
- 1995-02-22 MX MX9603542A patent/MX9603542A/es unknown
-
1996
- 1996-08-21 FI FI963266A patent/FI119514B/fi not_active IP Right Cessation
- 1996-08-22 US US08/701,339 patent/US5976855A/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100374556C (zh) * | 1998-11-27 | 2008-03-12 | 诺维信公司 | 脂解酶变体 |
CN104024393A (zh) * | 2011-12-29 | 2014-09-03 | 诺维信公司 | 具有脂肪酶变体的洗涤剂组合物 |
CN111187676A (zh) * | 2011-12-29 | 2020-05-22 | 诺维信公司 | 具有脂肪酶变体的洗涤剂组合物 |
WO2015085920A1 (en) * | 2013-12-11 | 2015-06-18 | Novozymes A/S | Cutinase variants and polynucleotides encoding same |
Also Published As
Publication number | Publication date |
---|---|
FI963266A0 (fi) | 1996-08-21 |
CN1077598C (zh) | 2002-01-09 |
EP0746618B1 (en) | 2002-08-21 |
FI963266A (fi) | 1996-08-21 |
JP3553958B2 (ja) | 2004-08-11 |
DE69527835D1 (de) | 2002-09-26 |
BR9506861A (pt) | 1997-09-23 |
ATE222604T1 (de) | 2002-09-15 |
KR970701264A (ko) | 1997-03-17 |
EP0746618A1 (en) | 1996-12-11 |
JPH09509058A (ja) | 1997-09-16 |
FI119514B (fi) | 2008-12-15 |
US5976855A (en) | 1999-11-02 |
MX9603542A (es) | 1997-03-29 |
CA2183431A1 (en) | 1995-08-24 |
DE69527835T2 (de) | 2003-04-10 |
WO1995022615A1 (en) | 1995-08-24 |
AU1806795A (en) | 1995-09-04 |
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