- EMDB-1759: Double helical filaments of an N-terminal thioredoxin fusion of TubZ -
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データベース: EMDB / ID: EMD-1759
タイトル
Double helical filaments of an N-terminal thioredoxin fusion of TubZ
マップデータ
Double helical filaments of a Thioredoxin N-terminal fusion of TubZ (Q8KNP3_BACTI) from bacillus thuringiensis serovar israelensis (ATCC 35646). density for the thioredoxin fusion of TubZ to remove positive density on the outer boundary of the negative stain and unconnected to the main helix.
ジャーナル: Proc Natl Acad Sci U S A / 年: 2010 タイトル: Filament structure of bacterial tubulin homologue TubZ. 著者: Christopher H S Aylett / Qing Wang / Katharine A Michie / Linda A Amos / Jan Löwe / 要旨: Low copy number plasmids often depend on accurate partitioning systems for their continued survival. Generally, such systems consist of a centromere-like region of DNA, a DNA-binding adaptor, and a ...Low copy number plasmids often depend on accurate partitioning systems for their continued survival. Generally, such systems consist of a centromere-like region of DNA, a DNA-binding adaptor, and a polymerizing cytomotive filament. Together these components drive newly replicated plasmids to opposite ends of the dividing cell. The Bacillus thuringiensis plasmid pBToxis relies on a filament of the tubulin/FtsZ-like protein TubZ for its segregation. By combining crystallography and electron microscopy, we have determined the structure of this filament. We explain how GTP hydrolysis weakens the subunit-subunit contact and also shed light on the partitioning of the plasmid-adaptor complex. The double helical superstructure of TubZ filaments is unusual for tubulin-like proteins. Filaments of ParM, the actin-like partitioning protein, are also double helical. We suggest that convergent evolution shapes these different types of cytomotive filaments toward a general mechanism for plasmid separation.
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注釈
Double helical filaments of a Thioredoxin N-terminal fusion of TubZ (Q8KNP3_BACTI) from bacillus thuringiensis serovar israelensis (ATCC 35646). density for the thioredoxin fusion of TubZ to remove positive density on the outer boundary of the negative stain and unconnected to the main helix.