Rapid evolution of primate antiviral enzyme APOBEC3G.

Abstract:

:Human cytidine deaminase APOBEC3G and the virion infectivity factor (vif) of the human immunodeficiency virus (HIV) are a pair of antagonistic molecules. In the absence of vif, APOBEC3G induces a high rate of dC to dU mutations in the nascent reverse transcripts of HIV that leads to the degradation of the HIV genome. HIV vif, on the other hand, can suppress the translation and trigger the degradation of human APOBEC3G. Here, we studied the rate of APOBEC3G gene evolution from five hominoids and two Old World monkeys. Averaged across the entire coding region, the rate of non-synonymous nucleotide substitutions is approximately 1.4 times the rate of synonymous substitutions, strongly suggesting that APOBEC3G has been under positive Darwinian selection. A comparison between the nucleotide polymorphisms within humans and the substitutions among the seven primates reveals a significant excess of non-synonymous substitutions. Furthermore, the rate of charge-altering non-synonymous substitution is approximately 1.8 times that of charge-conserving substitution, indicating that the selection is promoting the diversity of the protein charge profile. However, no difference in selective pressure on APOBEC3G is detected between hosts and non-hosts of HIV or simian immunodeficiency virus (SIV). These results, together with recent findings that the antiviral activity of APOBEC3G is not limited to HIV/SIV, suggest that the selective pressure on APOBEC3G is not solely from HIV/SIV and that APOBEC3G is a broad antiviral enzyme. The identification of pervasive positive selection for charge-altering amino acid substitutions supports the hypothesis of electrostatic interactions between APOBEC3G and vif or its functional equivalents.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Zhang J,Webb DM

doi

10.1093/hmg/ddh183

subject

Has Abstract

pub_date

2004-08-15 00:00:00

pages

1785-91

issue

16

eissn

0964-6906

issn

1460-2083

pii

ddh183

journal_volume

13

pub_type

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