Purification of Levan Fructotransferase from<i>Arthvobacter nicotinovoram</i>GS-9 and Production of DFA IV from Levan by the Enzyme
作者:Katsuichi Saito、Hiroko Goto、Atsushi Yokota、Fusao Tomita
DOI:10.1271/bbb.61.1705
日期:1997.1
A bacterial strain, GS-9, isolated from soil as a levan-degrading microorganism produced an extracellular enzyme that converted levan into DFA IV. This strain was identified as Arthrobacter nicotinovorvans. The DFA IV-producing enzyme was specifically induced by levan. The enzyme was purified 60-fold from culture supernatant to give a single band on SDS-PAGE. The molecular weight of this enzyme was 52,000 by SDS-PAGE and a monomer by gel filtration. The enzyme gave DFA IV as a main product (> 75%), and fructose, levanbiose, and two unidentified oligosaccharides as minor products, and was identified as a novel levan fructotransferase.
从土壤中分离出的一株名为 GS-9 的细菌是一种利凡烷降解微生物,它能产生一种细胞外酶,将利凡烷转化为 DFA IV。该菌株被鉴定为 Arthrobacter nicotinovorvans。产生 DFA IV 的酶是由利凡特异性诱导的。该酶从培养上清液中纯化了 60 倍,在 SDS-PAGE 上得到了一个单一的条带。通过 SDS-PAGE 分析,该酶的分子量为 52,000,通过凝胶过滤分析,其分子量为单体。该酶的主要产物为 DFA IV(> 75%),次要产物为果糖、左旋生物糖和两种不明低聚糖,被鉴定为一种新型的左旋果糖转移酶。