Discovery and characterization of family 39 glycoside hydrolases from rumen anaerobic fungi with polyspecific activity on rare arabinosyl substrates
作者:Darryl R. Jones、Muhammed Salah Uddin、Robert J. Gruninger、Thi Thanh My Pham、Dallas Thomas、Alisdair B. Boraston、Jonathan Briggs、Benjamin Pluvinage、Tim A. McAllister、Robert J. Forster、Adrian Tsang、L. Brent Selinger、D. Wade Abbott
DOI:10.1074/jbc.m117.789008
日期:2017.7
fungal genes (nf2152, nf2215, nf2523, and pr2455) were identified that encode family 39 glycoside hydrolases (GH39s), and have conserved structural features with GH51s. Two recombinant proteins, NF2152 and NF2523, were characterized using a variety of biochemical and structural techniques, and were determined to have distinct catalytic activities. NF2152 releases a single product, β1,2-arabinobiose (Ara2)
改善顽calc植物细胞壁多糖消化的酶活性可能为可持续工业提供解决方案。为此,瘤胃中的厌氧真菌已被确定为修饰植物细胞壁多糖和其他复杂聚糖的新型碳水化合物活性酶(CAZymes)的有前途的来源。许多CAZymes没有足够的序列同一性来鉴定其他微生物生态系统中的蛋白质,以推断其功能。因此,对它们的识别提出了挑战。在这项研究中,确定了四个瘤胃真菌基因(nf2152,nf2215,nf2523和pr2455),它们编码39族糖苷水解酶(GH39s),并与GH51s保持结构特征。使用多种生化和结构技术对两种重组蛋白NF2152和NF2523进行了表征,并确定具有独特的催化活性。NF2152从甜菜阿拉伯糖(SBA)释放单一产物β1,2-阿拉伯糖二糖(Ara2),从黑麦阿拉伯木聚糖(RAX)释放β1,2-Ara2和α-1,2-半乳糖阿拉伯糖(Gal-Ara)。NF2523从RAX独家释放α-1,2-Gal-Ara,这是对半乳糖(-α-1