Zenno S, Koike H, Tanokura M, Saigo K
Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Japan.
J Bacteriol. 1996 Aug;178(15):4731-3. doi: 10.1128/jb.178.15.4731-4733.1996.
NfsB is an oxygen-insensitive nitroreductase of Escherichia coli with significant amino acid sequence homology to the major flavin reductase (FRase I) of Vibrio fischeri. Here, we show that NfsB is convertible to an FRase I-like flavin reductase three times as active as the authentic FRase I by a single amino acid substitution in the least-conserved region.
NfsB是大肠杆菌的一种对氧不敏感的硝基还原酶,与费氏弧菌的主要黄素还原酶(FRase I)具有显著的氨基酸序列同源性。在此,我们表明,通过在保守性最低的区域进行单个氨基酸替换,NfsB可转化为一种活性是天然FRase I三倍的类FRase I黄素还原酶。