2vgq | pdb_00002vgq

CRYSTAL STRUCTURE OF HUMAN IPS-1 CARD

spinqualitylabelsall models 2vgq, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2vgq is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MTT, SO4 Related: 1mh3, 1hsj, 1y4c, 1ezo, 1fqc, 1anf, 1lls, 3mbp, 1zkb, 1mpb, 1dmb, 1ezp, 1ez9, 1zjl, 2h25, 1jvx, 1n3x, 1nl5, 1a7l, 1r6z, 1zmg, 1t0k, 1mh4, 1jw5, 1fqa, 1iud, 1ziu, 1mg1, 1mdp, 1fqb, 1jw4, 1omp, 1n3w, 1nmu, 1mpd, 1ytv, 1mdq, 1lax, 1peb, 1mpc, 1jvy, 1fqd, 1svx, 2d21 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed BACKGROUND: IPS-1/MAVS/VISA/Cardif is an adaptor protein that plays a crucial role in the induction of interferons in response to viral infection. In the initial stage of the intracellular antiviral response two RNA helicases, retinoic acid inducible gene-I (RIG-I) and melanoma differentiation-association gene 5 (MDA5), are independently able to bind viral RNA in the cytoplasm. The 62 kDa protein IPS-1/MAVS/VISA/Cardif contains an N-terminal caspase activation and recruitment (CARD) domain that associates with the CARD regions of RIG-I and MDA5, ultimately leading to the induction of type I interferons. As a first step towards understanding the molecular basis of this important adaptor protein we have undertaken structural studies of the IPS-1 MAVS/VISA/Cardif CARD region. RESULTS: The crystal structure of human IPS-1/MAVS/VISA/Cardif CARD has been determined to 2.1A resolution. The protein was expressed and crystallized as a maltose-binding protein (MBP) fusion protein. The MBP and IPS-1 components each form a distinct domain within the structure. IPS-1/MAVS/VISA/Cardif CARD adopts a characteristic six-helix bundle with a Greek-key topology and, in common with a number of other known CARD structures, contains two major polar surfaces on opposite sides of the molecule. One face has a surface-exposed, disordered tryptophan residue that may explain the poor solubility of untagged expression constructs. CONCLUSION: The IPS-1/MAVS/VISA/Cardif CARD domain adopts the classic CARD fold with an asymmetric surface charge distribution that is typical of CARD domains involved in homotypic protein-protein interactions. The location of the two polar areas on IPS-1/MAVS/VISA/Cardif CARD suggest possible types of associations that this domain makes with the two CARD domains of MDA5 or RIG-I. The N-terminal CARD domains of RIG-I and MDA5 share greatest sequence similarity with IPS-1/MAVS/VISA/Cardif CARD and this has allowed modelling of their structures. These models show a very different charge profile for the equivalent surfaces compared to IPS-1/MAVS/VISA/Cardif CARD. Crystal structure of human IPS-1/MAVS/VISA/Cardif caspase activation recruitment domain.,Potter JA, Randall RE, Taylor GL BMC Struct Biol. 2008 Feb 28;8:11. PMID:18307765 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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