Cryoelectron-Microscopic Structure of the pKpQIL Conjugative Pili from Carbapenem-Resistant Klebsiella pneumoniae.

Cryoelectron-Microscopic Structure of the pKpQIL Conjugative Pili from Carbapenem-Resistant Klebsiella pneumoniae.
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来自耐碳青霉烯的Kleblebsiella肺炎的PKPQIL共轭Pili的冷冻电子 - 微观结构。

DOI:
10.1016/j.str.2020.08.010
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发表时间:
2020-12-01
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Egelman EH
Egelman EH
中科院分区:
其他
文献类型:
--
作者:
Zheng W;Pena A;Low WW;Wong JLC;Frankel G;Egelman EH

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Conjugative pili are important in mediating bacterial conjugation and horizontal gene transfer. Since plasmid transfer can include antibiotic resistance genes, conjugation is an important mechanism in the spread of antibiotic resistance. Filamentous bacteriophages have been shown to exist in two different structural classes: those with a 5-fold rotational symmetry, and those with a 1-start helix with ~ five subunits per turn. Structures for the F and the F-like pED208 conjugation pilus have shown that they have 5-fold rotational symmetry. Here, we report the cryo-EM structure of conjugative pili from carbapenem-resistant Klebsiella pneumoniae, encoded on the IncFIIK pKpQIL plasmid, at 3.9 Å resolution and show that it has a 1-start helix. These results establish that conjugation pili can exist in at least two structural classes, consistent with other results showing that relatively small perturbations are needed to change the helical symmetry of polymers. Filamentous bacteriophage have been known for many years to exist in two structural classes, those with 5-fold rotational symmetry and those with no rotational symmetry. Zheng et al. show that mating pili can also exist in these same two structural classes.
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