期刊
NATURE STRUCTURAL & MOLECULAR BIOLOGY
卷 13, 期 5, 页码 392-399出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb1086
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资金
- NIGMS NIH HHS [R37GM21422] Funding Source: Medline
- PHS HHS [ESO13192] Funding Source: Medline
Akin to a 'Trojan horse,' APOBEC3G DNA deaminase is encapsulated by the HIV virion. APOBEC3G facilitates restriction of HIV-1 infection in T cells by deaminating cytosines in nascent minus-strand complementary DNA. Here, we investigate the biochemical basis for C -> U targeting. We observe that APOBEC3G binds randomly to single-stranded DNA, then jumps and slides processively to deaminate target motifs. When confronting partially double-stranded DNA, to which APOBEC3G cannot bind, sliding is lost but jumping is retained. APOBEC3G shows catalytic orientational specificity such that deamination occurs predominantly 3'-> 5' without requiring hydrolysis of a nucleotide cofactor. Our data suggest that the G -> A mutational gradient generated in viral genomic DNA in vivo could result from an intrinsic processive directional attack by APOBEC3G on single-stranded cDNA.
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