SECRETION OF ACTIVE BETA-LACTAMASE TO THE MEDIUM MEDIATED BY THE ESCHERICHIA-COLI HEMOLYSIN TRANSPORT PATHWAY

被引:28
作者
CHERVAUX, C
SAUVONNET, N
LECLAINCHE, A
KENNY, B
HUNT, AL
BROOMESMITH, JK
HOLLAND, IB
机构
[1] UNIV PARIS 11, INST GENET & MICROBIOL, CNRS, URA 1354, F-91405 ORSAY, FRANCE
[2] UNIV SUSSEX, SCH BIOL SCI, BRIGHTON, E SUSSEX, ENGLAND
来源
MOLECULAR AND GENERAL GENETICS | 1995年 / 249卷 / 02期
关键词
HEMOLYSIN; SECRETION; BETA-LACTAMASE; ESCHERICHIA COLI;
D O I
10.1007/BF00290371
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
An in frame gene fusion containing the coding region for mature beta-lactamase and the 3'-end of hylA encoding the haemolysin secretion signal, was constructed under the control of a lac promoter. The resulting 53 kDa hybrid protein was specifically secreted to the external medium in the presence of the haemolysin translocator proteins, HlyB and HlyD. The specific activity of the beta-lactamase portion of the secreted protein (measured by the hydrolysis of penicillin G), approximately 1 U/mu g protein, was close to that of authentic, purified TEM-beta-lactamase. This is an important example of a hybrid protein that is enzymatically active, and secreted via the haemolysin pathway. Previous studies have indicated that haemolysin is secreted directly into the medium, bypassing the periplasm, to which beta-lactamase is normally targeted. This study indicated, therefore, that normal folding of an active beta-lactamase, can occur, at least when fused to the HlyA C-terminus, without the necessity of entering the periplasm. Despite the secretion of approximately 5 mu g/ml. levels of the active beta-lactamase fusion into the medium, there was maximally only a 50% detectable increase in the LD(50) for resistance to ampicillin at the individual cell level. This result suggests that, normally, resistance to ampicillin requires a high concentration of the enzyme close to killing targets, i.e. in the periplasm, in order to achieve significant levels of protection.
引用
收藏
页码:237 / 245
页数:9
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