期刊
JOURNAL OF BACTERIOLOGY
卷 187, 期 1, 页码 224-230出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.187.1.224-230.2005
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资金
- NCRR NIH HHS [RR04050, P41 RR004050] Funding Source: Medline
- NIGMS NIH HHS [GM29647, R01 GM029647] Funding Source: Medline
- NATIONAL CENTER FOR RESEARCH RESOURCES [P41RR004050] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM029647] Funding Source: NIH RePORTER
The mechanism of nonflagellar swimming of marine unicellular cyanobacteria remains poorly understood. SwmA is an abundant cell surface-associated 130-kDa glycoprotein that is required for the generation of thrust in Synechococcus sp. strain WH8102. Ultrastructural comparisons of wild-type cells to a mutant strain in which the gene encoding SwmA has been insertionally inactivated reveal that the mutant lacks a layer external to the outer membrane. Cryofixation and freeze-substitution are required for the preservation of this external layer. Freeze fracturing and etching reveal that this additional layer is an S-layer. How the S-layer might function in motility remains elusive; however, this work describes an ultrastructural component required for this unique type of swimming. In addition, the work presented here describes the envelope structure of a model swimming cyanobacterium.
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