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羽毛角蛋白酶生产菌的选育及产酶条件研究   总被引:3,自引:0,他引:3  
从长期堆积废羽毛的土壤中分离筛选出15株对羽毛有降解能力的细菌,然后经过摇瓶复筛得到一株对羽毛有较强降解能力的菌株,该菌内生孢子,革兰氏染色阳性,为一芽孢杆菌,摇瓶发酵的最适条件为:温度42度,pH为7.5,转速125rpm,最高酶活力达25.20U/mL,外加其他碳源或氮源对角蛋白酶的产生有一定的影响。  相似文献
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从羽毛废弃物中筛选出一株高效降解羽毛、产角蛋白酶和蛋白酶的革兰氏阳性芽孢杆菌,经鉴定为枯草芽孢杆菌(Bacillus sublitis),命名为B.sublitisYYW-1。利用紫外线对菌株YYW-1进行诱变,筛选蛋白酶缺陷株,获得蛋白酶活性丧失的诱变株YYW-1-5,其蛋白酶活性残余22.7%,而角蛋白酶活性残余94.7%,没有明显的变化。  相似文献
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A new feather-degrading bacterium was isolated from a local feather waste site and identified as Bacillus subtilis based on morphological, physiochemical, and phylogenetic characteristics. Screening for mutants with elevated keratinolytic activity using N-methyl-N'-nitro-N-nitrosoguanidine mutagenesis resulted in a mutant strain KD-N2 producing keratinolytic activity about 2.5 times that of the wild-type strain. The mutant strain produced inducible keratinase in different substrates of feathers, hair, wool and silk under submerged cultivation. Scanning electron microscopy studies showed the degradation of feathers, hair and silk by the keratinase. The optimal conditions for keratinase production include initial pH of 7.5, inoculum size of 2% (v/v), age of inoculum of 16 h, and cultivation at 23 ℃. The maximum keratinolytic activity of KD-N2 was achieved after 30 h. Essential amino acids like threonine, valine, methionine as well as ammonia were produced when feathers were used as substrates. Strain KD-N2, therefore, shows great promise of finding potential applications in keratin hydrolysis and keratinase production.  相似文献
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