点状念珠藻中一种替代σ因子的突变导致其共生植物伙伴斑点角苔的感染增加。
Mutation of an alternative sigma factor in the cyanobacterium Nostoc punctiforme results in increased infection of its symbiotic plant partner, Anthoceros punctatus.
作者信息
Campbell E L, Brahamsha B, Meeks J C
机构信息
Section of Microbiology, Division of Biological Sciences, University of California, Davis, California 95616, USA.
出版信息
J Bacteriol. 1998 Sep;180(18):4938-41. doi: 10.1128/JB.180.18.4938-4941.1998.
Abstract
An alternative group 2 sigma factor was identified in the nitrogen-fixing, symbiotically competent cyanobacterium Nostoc punctiforme and designated sigH. Transcription of sigH was specifically induced within 1.5 h following exposure of N. punctiforme to its symbiotic plant partner, Anthoceros punctatus. A mutation in sigH resulted in a sixfold-higher initial infection of A. punctatus tissue without a parallel increase in nitrogen-fixing activity.
摘要
在具有固氮能力且具备共生能力的点状念珠藻中鉴定出了一种替代性的第2组σ因子，并将其命名为sigH。点状念珠藻暴露于其共生植物伙伴斑点角苔后1.5小时内，sigH的转录被特异性诱导。sigH中的一个突变导致斑点角苔组织的初始感染率提高了六倍，而固氮活性却没有相应增加。
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