1gwp

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STRUCTURE OF THE N-TERMINAL DOMAIN OF THE MATURE HIV-1 CAPSID PROTEIN

Structural highlights

1gwp is a 1 chain structure with sequence from Human immunodeficiency virus type 1 (NEW YORK-5 ISOLATE). This structure supersedes the now removed PDB entries 1gds, 1gdy and 1gdz. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Solution NMR
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

GAG_HV1N5 Matrix protein p17 targets Gag and Gag-Pol polyproteins to the plasma membrane via a multipartite membrane binding signal, that includes its myristoylated N-terminus. Also mediates nuclear localization of the preintegration complex. Implicated in the release from host cell mediated by Vpu. Capsid protein p24 forms the conical core of the virus that encapsulates the genomic RNA-nucleocapsid complex. Nucleocapsid protein p7 encapsulates and protects viral dimeric unspliced (genomic) RNA. Binds these RNAs through its zinc fingers. p6-gag plays a role in budding of the assembled particle by interacting with the host class E VPS proteins TSG101 and PDCD6IP/AIP1 (By similarity).

Publication Abstract from PubMed

The capsid protein (CA) of the mature human immunodeficiency virus (HIV) contains an N-terminal beta-hairpin that is essential for formation of the capsid core particle. CA is generated by proteolytic cleavage of the Gag precursor polyprotein during viral maturation. We have determined the NMR structure of a 283-residue N-terminal fragment of immature HIV-1 Gag (Gag(283)), which includes the intact matrix (MA) and N-terminal capsid (CA(N)) domains. The beta-hairpin is unfolded in Gag(283), consistent with the proposal that hairpin formation occurs subsequent to proteolytic cleavage of Gag, triggering capsid assembly. Comparison of the immature and mature CA(N) structures reveals that beta-hairpin formation induces a approximately 2 A displacement of helix 6 and a concomitant displacement of the cyclophylin-A (CypA)-binding loop, suggesting a possible allosteric mechanism for CypA-mediated destabilization of the capsid particle during infectivity.

Structure of the N-terminal 283-residue fragment of the immature HIV-1 Gag polyprotein.,Tang C, Ndassa Y, Summers MF Nat Struct Biol. 2002 Jul;9(7):537-43. PMID:12032547[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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Citations
17 reviews cite this structure
HIV-1 assembly, budding, and maturation.
Sundquist et al. (2012)
16 more
116 other articles
No citations found

See Also

References

  1. ↑ Tang C, Ndassa Y, Summers MF. Structure of the N-terminal 283-residue fragment of the immature HIV-1 Gag polyprotein. Nat Struct Biol. 2002 Jul;9(7):537-43. PMID:12032547 doi:10.1038/nsb806

Contents


PDB ID 1gwp

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