The I domain is required for efficient plasma membrane binding of human immunodeficiency virus type 1 Pr55Gag.

Abstract:

:The interaction of the human immunodeficiency virus type 1 (HIV-1) Pr55Gag molecule with the plasma membrane of an infected cell is an essential step of the viral life cycle. Myristic acid and positively charged residues within the N-terminal portion of MA constitute the membrane-binding domain of Pr55Gag. A separate assembly domain, termed the interaction (I) domain, is located nearer the C-terminal end of the molecule. The I domain is required for production of dense retroviral particles, but has not previously been described to influence the efficiency of membrane binding or the subcellular distribution of Gag. This study used a series of Gag-green fluorescent protein fusion constructs to define a region outside of MA which determines efficient plasma membrane interaction. This function was mapped to the nucleocapsid (NC) region of Gag. The minimal region in a series of C-terminally truncated Gag proteins conferring plasma membrane fluorescence was identified as the N-terminal 14 amino acids of NC. This same region was sufficient to create a density shift in released retrovirus-like particles from 1.13 to 1.17 g/ml. The functional assembly domain previously termed the I domain is thus required for the efficient plasma membrane binding of Gag, in addition to its role in determining the density of released particles. We propose a model in which the I domain facilitates the interaction of the N-terminal membrane-binding domain of Pr55Gag with the plasma membrane.

journal_name

J Virol

journal_title

Journal of virology

authors

Sandefur S,Varthakavi V,Spearman P

doi

10.1128/JVI.72.4.2723-2732.1998

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

2723-32

issue

4

eissn

0022-538X

issn

1098-5514

journal_volume

72

pub_type

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