Monomeric APOBEC3G is catalytically active and has antiviral activity.

Abstract:

:APOBEC3G (APO3G) is a cytidine deaminase that restricts replication of vif-defective human immunodeficiency virus type 1 (HIV-1). Like other members of the cellular deaminase family, APO3G has the propensity to form homo-multimers. In the current study, we investigated the functional determinants for multimerization of human APO3G and studied the role of APO3G multimerization for catalytic activity, virus encapsidation, and antiviral activity. We found that human APO3G is capable of forming multimeric complexes in transfected HeLa cells. Interestingly, multimerization of APO3G was exquisitely sensitive to RNase treatment, suggesting that interaction of APO3G subunits is facilitated or stabilized by an RNA bridge. Mutation of a conserved cysteine residue (C97) that is part of an N-terminal zinc-finger motif in APO3G abolished multimerization of APO3G; however, the C97 mutation inhibited neither in vitro deaminase activity nor antiviral function of APO3G. These results suggest that monomeric APO3G is both catalytically active and has antiviral activity. Interference studies employing either catalytically inactive or packaging-incompetent APO3G variants suggest that wild-type APO3G is packaged into HIV-1 particles in monomeric form. These results provide novel insights into the catalytic function and antiviral property of APO3G and demonstrate an important role for C97 in the RNA-dependent multimerization of this protein.

journal_name

J Virol

journal_title

Journal of virology

authors

Opi S,Takeuchi H,Kao S,Khan MA,Miyagi E,Goila-Gaur R,Iwatani Y,Levin JG,Strebel K

doi

10.1128/JVI.80.10.4673-4682.2006

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

4673-82

issue

10

eissn

0022-538X

issn

1098-5514

pii

80/10/4673

journal_volume

80

pub_type

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