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20株木腐菌高产漆酶菌株的筛选

2015-08-13刘卉娟等

湖北农业科学 2015年12期

刘卉娟等

摘要:采用PDA-苯胺蓝显示法检测了20株木腐菌的产漆酶特性,初筛选出8株产漆酶菌株,通过液体发酵培养进一步检测其漆酶活性。结果显示,能够产生漆酶的菌株中只有6株检测到漆酶活性,其中SWFC9938产漆酶能力最强,最高平均酶活性可达1 656.82 U/mL,为高产漆酶菌株。Cu2+和藜芦醇诱导能显著提高SWFC9938的产酶能力,最高平均酶活性分别可达2 485.10和2 454.24 U/mL。藜芦醇能明显缩短最高产酶的发酵时间,发酵8 d时即出现酶活性高峰(对照出现在12 d以后),藜芦醇对SWFC9938菌株具有很好的诱导产酶活性。

关键词:木腐菌;漆酶;菌株筛选;诱导培养

中图分类号:Q55 文献标识码:A 文章编号:0439-8114(2015)12-2858-05

DOI:10.14088/j.cnki.issn0439-8114.2015.12.012

The Screening on the High Production of Laccase from 20 Wood-rotting Fungi

LIU Hui-Juan,AO Xin-yu,HONG Hai-di,YANG Yan-xian,CHEN Yu-hui

(College Of Life Science, Southwest Forestry University, Kunming 650224, Yunnan,China)

Abstract: Used PDA-aniline blue display method to detect the 20 strains producing laccase properties of wood rotting fungi,selected 8 strains producing laccase strains and developed further testing the laccase activity by liquid fermentation. The results showed that,the crude laccase which liquid fermentation among six potential strains exhibited high catalytic activity and the highest laccase activity approximated 1 656.82 U/mL for SWFC 9938. It was found that copper and veratryl alcohol were the best laccase inducers for strain SWFC 9938 with 2 485.10 U/mL and 2 454.24 U/mL respectively. Veratryl alcohol could obviously shorten the fermentation time of the maximum enzyme production,the maximum laccase activity appeared at 8 days cultivation (the maximum laccase activity of control material was at 12 days cultivation), indicating that veratryl alcohol might be laccase-induced potential.

Key words: wood rotting fungi;laccase;strains screening;induction training

木质素是一种以苯丙烷为基本结构单元构成的芳香族高分子化合物,为植物主要组成成分之一。木质素在植物组织中与半纤维素以共价键形式结合,将纤维素分子包埋其中,形成一种坚固的天然屏障,使一般微生物及其酶很难侵染和进入,从而导致木质素的降解成为地球生物圈中碳素循环的主要障碍[1]。自然界参与降解木质素的微生物有真菌、放线菌和细菌等,但已知的惟一能广泛降解木质素的生物是真菌[2]。因此从真菌中筛选高产木质素降解酶的菌株对实现木质素的降解具有重要意义。木质素降解需要木质素降解酶,木质素降解酶有3种,即木质素过氧化物酶(Lip)、锰依赖性过氧化物酶(Mnp)和漆酶(Laccase)[3]。漆酶是一种含铜的多酚氧化酶(EC1.10.3.2),广泛存在于真菌中。由于漆酶作用底物广泛,包括酚及其衍生物、芳胺及其衍生物、羧酸及其衍生物、甾体激素和生物色素、金属有机化合物等。……

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