THE SYMBIOTIC DEFECT OF RHIZOBIUM-MELILOTI EXOPOLYSACCHARIDE MUTANTS IS SUPPRESSED BY LPSZ+, A GENE INVOLVED IN LIPOPOLYSACCHARIDE BIOSYNTHESIS

被引：53

作者：

WILLIAMS, MNV

HOLLINGSWORTH, RI

KLEIN, S

SIGNER, ER

机构：

[1] MIT,DEPT BIOL,CAMBRIDGE,MA 02139

[2] MICHIGAN STATE UNIV,DEPT BIOCHEM,E LANSING,MI 48824

来源：

JOURNAL OF BACTERIOLOGY | 1990年 / 172卷 / 05期

关键词：

D O I：

10.1128/jb.172.5.2622-2632.1990

中图分类号：

Q93 [微生物学];

学科分类号：

071005 ; 100705 ;

摘要：

exo mutants of Rhizobium meliloti SU47, which fail to secrete acidic extracellular polysaccharide (EPS), induce Fix- nodules on alfalfa. However, mutants of R. meliloti Rm41 carrying the same exo lesions induce normal Fix+ nodules. We show that such induction is due to a gene from strain Rm41, which we call lpsZ+, that is missing in strain SU47. lpsZ+ does not restore EPS production but instead alters the composition and structure of lipopolysaccharide. In both SU47 and Rm41, either lpsZ+ or exo+ is sufficient for normal nodulation. This suggests that in R. meliloti EPS and lipopolysaccharide can perform the same function in nodule development.

引用

页码：2622 / 2632

页数：11

共 48 条

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