期刊
NATURE
卷 408, 期 6813, 页码 745-750出版社
MACMILLAN PUBLISHERS LTD
DOI: 10.1038/35047129
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资金
- NIGMS NIH HHS [R37 GM033050] Funding Source: Medline
Motors generating mechanical force, powered by the hydrolysis of ATP, translocate double-stranded DNA into preformed capsids (proheads) of bacterial viruses(1,2) and certain animal viruses(3). Here we describe the motor that packages the double-stranded DNA of the Bacillus subtilis bacteriophage phi 29 into a precursor capsid. We determined the structure of the head-tail connector-the central component of the phi 29 DNA packaging motor-to 3.2 Angstrom resolution by means of X-ray crystallography. We then fitted the connector into the electron densities of the prohead and of the partially packaged prohead as determined using cryo-electron microscopy and image reconstruction analysis. Our results suggest that the prohead plus dodecameric connector, prohead RNA, viral ATPase and DNA comprise a rotary motor with the head-prohead RNA-ATPase complex acting as a stator, the DNA acting as a spindle, and the connector as a ball-race. The helical nature of the DNA converts the rotary action of the connector into translation of the DNA.
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