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名称
β-内酰胺酶
别名
青霉素酶 | 头孢菌素酶 | 碳青霉烯酶
英文别名
CENTA | 80072-86-2 | 9073-60-3 | CENTA(TM) BETA-LACTAMASE SUBSTRATE | (6R,7R)-3-[(3-carboxy-4-nitrophenyl)sulfanylmethyl]-8-oxo-7-[(2-thiophen-2-ylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid | CHEMBL1650032 | SCHEMBL10876201 | DTXSID40230061 | AKO
货号
L140816-10MU
包装规格
10MU
级别
EnzymoPure™
浓度
冻干粉
产品介绍
可水解β-内酰胺类抗生素。已发现二百多种β-内酰胺酶。青霉素酶的分类方法主要有两种,分子生物学方法和BUSH法。分子生物学法将酶分为四类。A类酶包括多种质粒编码的青霉素酶,活性部位为丝氨酸残基,分子量为29kDa。B类酶为金属酶,由染色体或质粒编码,酶活性需锌离子参与,可被乙二胺四乙酸(EDTA)抑制。C类酶的活性部位为丝氨酸残基,分子量为39kDa,其产生与诱导剂有关。C类酶主要指染色体编码的头孢菌素酶(AmpC酶)。D类酶又称为OXA型(水解苯唑西林)β-内酰胺酶。另一种分类方法为BUSH应用于环境中残留青霉素的清除;医疗器械残留青霉素的清以及青霉素效价测定中本底的清除; 用基因重组技术在大肠杆菌表达体系生产β-内酰胺酶(序列来自大肠杆菌),属于分子生物学分类A类,BUSH分类第二类的青霉素酶,学名为TEM1,目前有天然酶和融合酶两种形式提供。 生化机理: 其他底物的典型分析:头孢曲松 2-4 un/mg;头孢唑林 2-4 un/mg;头孢他啶 1.5-3 un/mg;头孢西丁 0.35-0.7 un/mg;头孢吡肟 1.2-2.4 un/mg;头孢呋辛 1.5-3 un/mg;头孢噻肟 1-2 un/mg,奥沙西林 4-8 un/mg;亚胺培南 1.2-2.4 un/mg;美罗培南 3-6 un/mg β-内酰胺酶通过打断 β-内酰胺环而灭活 β-内酰胺抗生素。其他底物的典型分析:头孢曲松 2-4 un/mg;头孢唑林 2-4 un/mg;头孢他啶 1.5-3 un/mg;头孢西丁 0.35-0.7 un/mg;头孢吡肟 1.2-2.4 un/mg;头孢呋辛 1.5-3 un/mg;头孢噻肟 1-2 un/mg,奥沙西林 4-8 un/mg;亚胺培南 1.2-2.4 un/mg;美罗培南 3-6 un/mg。 Penicillinase from Bacillus cereus has been shown to contain three distinct species when purified and examined for homogeneity by sedimentation analysis, amino-terminal analysis, and vertical acrylamide gel electrophoresis. Penicillinase can be used to reduce levels of penicillin in patients with severe penicillin reactions. Used in the production of penicillin. Penicillinase from Bacillus cereus has been used in a comparison study with penicillinase from Bacillus subtillis where the Michaelis constant, shape of the Ph/activity curve and immunological properties were shown to be significantly different. Used in the production of penicillin.
生化机理
β 内酰胺酶通过打开 β 内酰胺环使 β 内酰胺抗生素失活1。其他底物的典型分析:头孢曲松 2-4 un/mg;头孢唑啉 2-4 un/mg;头孢唑肟 1.5-3 un/mg;头孢西丁 0.35-0.7 un/mg;头孢吡肟 1.2-2.4 un/mg; cefuroxime 1.5-3 un/mg; cefotaxime 1-2 un/mg, oxacillin 4-8 un/mg; imipenem 1.2-2.4 un/mg; and meropenem 3-6 un/mg.Yellow chromogenic β-内酰胺酶底物。除嗜水气单胞菌金属酶外,在所有 β-内酰胺酶存在下均易水解。适用于动力学研究、粗提取物和色谱馏分中酶的检测。
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Research chemical; supplied for laboratory research, analysis, inspection, and scientific procurement use.

item number:L140816-10MU
Product model:10MU
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