2mgu | pdb_00002mgu

Structure of the complex between calmodulin and the binding domain of HIV-1 matrix protein

spinqualitylabelsall models 2mgu, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2mgu is a 2 chain structure with sequence from 9hiv1 and Buffalo rat. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA Gene: Calm1, Calm, Cam, Cam1, Calm2, Cam2, Camb, Calm3, Cam3, Camc (Buffalo rat), gag (9HIV1) Resources: FirstGlance, OCA, RCSB, PDBsum Function [Q7ZJG2_9HIV1] Capsid protein p24 forms the conical core of the virus that encapsulates the genomic RNA-nucleocapsid complex (By similarity).[SAAS:SAAS000071_004_008806] Nucleocapsid protein p7 encapsulates and protects viral dimeric unspliced (genomic) RNA. Binds these RNAs through its zinc fingers (By similarity).[SAAS:SAAS001878_004_011858] Publication Abstract from PubMed Subcellular distribution of calmodulin (CaM) in human immunodeficiency virus type-1 (HIV-1)-infected cells is distinct from that observed in uninfected cells. CaM co-localizes and interacts with the HIV-1 Gag protein in the cytosol of infected cells. Although it has been shown that binding of Gag to CaM is mediated by the matrix (MA) domain, the structural details of this interaction are not known. We have recently shown that binding of CaM to MA induces a conformational change that triggers myristate exposure, and that the CaM-binding domain of MA is confined to a region spanning residues 8-43 (MA-(8-43)). Here, we present the NMR structure of CaM bound to MA-(8-43). Our data revealed that MA-(8-43), which contains a novel CaM-binding motif, binds to CaM in an antiparallel mode with the N-terminal helix (alpha1) anchored to the CaM C-terminal lobe, and the C-terminal helix (alpha2) of MA-(8-43) bound to the N-terminal lobe of CaM. The CaM protein preserves a semiextended conformation. Binding of MA-(8-43) to CaM is mediated by numerous hydrophobic interactions and stabilized by favorable electrostatic contacts. Our structural data are consistent with the findings that CaM induces unfolding of the MA protein to have access to helices alpha1 and alpha2. It is noteworthy that several MA residues involved in CaM binding have been previously implicated in membrane binding, envelope incorporation, and particle production. The present findings may ultimately help in identification of the functional role of CaM in HIV-1 replication. Solution structure of calmodulin bound to the binding domain of the HIV-1 matrix protein.,Vlach J, Samal AB, Saad JS J Biol Chem. 2014 Mar 21;289(12):8697-705. doi: 10.1074/jbc.M113.543694. Epub, 2014 Feb 5. PMID:24500712 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Calmodulin

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