摘要
从成都皮革厂等堆积废弃毛皮、皮革的场所采集土样 ,通过以明胶为主要基质培养基进行富集和初筛 ,获得 95株有明胶酶活性菌株。挑选其中 2 8株明胶酶活性较高的菌株进行牛皮消化试验 ,有 1 2株菌能在 48h内完全消化小牛皮。以III型酸溶性胶原为底物 ,测定了 1 2株菌发酵培养液中胶原蛋白酶活性 ,确认这 1 2株菌都具有胶原蛋白酶活性 ,酶活力基本相同 ,约 1 0～ 1 6U mL。经形态观察、生理生化特征分析及BIOLOG微生物鉴定仪鉴定 ,这 1 2株菌分为两类 ,分别是铜绿假单胞菌 (Pseudomonasaeraginosa)和火神发光杆菌 (Photobacteriumlogei) (结果另文发表 )。对铜绿假单胞菌产生胶原蛋白酶粗酶性质进行了研究 ,其酶活最适温度为 32℃ ,最适pH为 7 5 ,可以被金属蛋白酶抑制剂EDTA和EGTA部分抑制 ,不能被PMSF抑制。对铜绿假单胞菌产胶原蛋白酶发酵条件的研究表明 ,不仅培养基中氮源、碳源和金属离子影响产酶量 ,而且发酵工艺对胶原蛋白酶的产生也有较大影响。
Bacteria isolated from rotten hides,one identified as Pseudomonas aeraginosa later, were shown to decompose fresh hides completely in 48 hours at room temperature. Strongly collagenolytic activity was detected when native collagen from calfskin was used as substrate. The optimal reaction pH value and temperature of the collagenace produced by P.aeraginosa are 7.5 and 32℃ respectively. EDTA and EGTA inhabit the collagenolytic activity severely while PMSF has little effect on it. Not only media components but also fermentation conditions have differents effect on the production of this collagenolyic enzyme.
出处
《微生物学通报》
CAS
CSCD
北大核心
2004年第5期43-48,共6页
Microbiology China
基金
国家高科技计划项目 (No 2 0 0 2AA2 1 41 81 )
