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.
#241 - 2020年1月 20年の分子を振り返って (Twenty Years of Molecules) 類似性 (1)
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A: FTSZ/TUBULIN-RELATED PROTEIN B: FTSZ/TUBULIN-RELATED PROTEIN C: FTSZ/TUBULIN-RELATED PROTEIN D: FTSZ/TUBULIN-RELATED PROTEIN E: FTSZ/TUBULIN-RELATED PROTEIN F: FTSZ/TUBULIN-RELATED PROTEIN G: FTSZ/TUBULIN-RELATED PROTEIN H: FTSZ/TUBULIN-RELATED PROTEIN I: FTSZ/TUBULIN-RELATED PROTEIN J: FTSZ/TUBULIN-RELATED PROTEIN K: FTSZ/TUBULIN-RELATED PROTEIN L: FTSZ/TUBULIN-RELATED PROTEIN ヘテロ分子