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走遍四方 发表于 2011-9-26 16:27
回复 StephenW 的帖子
Finally, I know this is pedantic, what about hbv mutants that can escape your ...
I know I am just being difficult, but I guess k-factor is based on APBEC3G, and HIV has evolved a defence mechanism against it. Likewise, many viruses have evolved mechanism to reduce the antiviral effects of Interferon.
APOBEC3G (apoplipoprotein B mRNA-editing, enzyme-catalytic, polypeptide-like 3G) is a human enzyme encoded by the APOBEC3G gene that belongs to the APOBEC superfamily of proteins.[1] This family of proteins has been suggested to play an important role in innate anti-viral immunity.[2] APOBEC3G is a cytadine deaminase enzyme and is therefore known as DNA dC->dU-editing enzyme APOBEC-3G and APOBEC-related cytidine deaminase (ARCD).[1]
APOBEC3G exerts innate antiretroviral immune activity against retroviruses, most notably HIV, by interfering with proper replication. However, lentiviruses such as HIV have evolved the Viral infectivity factor (Vif) protein in order to counteract this effect. Vif interacts with APOBEC3G and triggers the ubiquitination and degradation of APOBEC3G via the proteasomal pathway.[3]
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