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淋病奈瑟菌主要铁调节外膜蛋白FrpB编码基因的克隆、测序及特性分析

Cloning, sequencing, and characterization of the gene encoding FrpB, a major iron-regulated, outer membrane protein of Neisseria gonorrhoeae.

作者信息

Beucher M, Sparling P F

机构信息

Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill 27599, USA.

出版信息

J Bacteriol. 1995 Apr;177(8):2041-9. doi: 10.1128/jb.177.8.2041-2049.1995.

Abstract

FrpB (for Fe-regulated protein B) is a 76-kDa outer membrane protein that is part of the iron regulon of Neisseria gonorrhoeae and Neisseria meningitidis. The frpB gene from gonococcal strain FA19 was cloned and sequenced. FrpB was homologous to several TonB-dependent outer membrane receptors of Escherichia coli as well as HemR of Yersinia enterocolitica and CopB of Moraxella catarrhalis. An omga insertion into the frpB coding sequence caused a 60% reduction in 55Fe uptake from heme, but careful analysis suggested that this effect was nonspecific. While FrpB was related to the family of TonB-dependent proteins, a function in iron uptake could not be documented.

摘要

FrpB(铁调节蛋白B)是一种76千道尔顿的外膜蛋白,是淋病奈瑟菌和脑膜炎奈瑟菌铁调节子的一部分。对淋病奈瑟菌菌株FA19的frpB基因进行了克隆和测序。FrpB与大肠杆菌的几种TonB依赖性外膜受体、小肠结肠炎耶尔森菌的HemR以及卡他莫拉菌的CopB具有同源性。在frpB编码序列中插入一个ω元件导致从血红素摄取55Fe的量减少了60%,但仔细分析表明这种效应是非特异性的。虽然FrpB与TonB依赖性蛋白家族有关,但在铁摄取中的功能尚无记录。

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