5m33 | pdb_00005m33

Structural tuning of CD81LEL (space group P21)

spinqualitylabelsall models 5m33, resolution 1.28Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5m33 is a 2 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: EDO Related: 1g8q, 5m2c, 5m3d, 5m4r, 5m3t, 1iv5 Gene: CD81, TAPA1, TSPAN28 (HUMAN) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Disease [CD81_HUMAN] Defects in CD81 are the cause of immunodeficiency common variable type 6 (CVID6) [MIM:613496]; also called antibody deficiency due to CD81 defect. CVID6 is a primary immunodeficiency characterized by antibody deficiency, hypogammaglobulinemia, recurrent bacterial infections and an inability to mount an antibody response to antigen. The defect results from a failure of B-cell differentiation and impaired secretion of immunoglobulins; the numbers of circulating B-cells is usually in the normal range, but can be low. Function [CD81_HUMAN] May play an important role in the regulation of lymphoma cell growth. Interacts with a 16-kDa Leu-13 protein to form a complex possibly involved in signal transduction. May act as the viral receptor for HCV. Publication Abstract from PubMed Hepatitis C virus (HCV) enters into human hepatocytes via tetraspanin hCD81. HCV glycoprotein E2 recognizes the "head" subdomain of the large extracellular loop (LEL) of CD81 (hCD81LEL), but the precise mechanism of virus cell attachment and entry remains elusive. Here, by combining the structural analysis of a conspicuous number of crystallized CD81LEL molecules with molecular dynamics simulations, we show that the conformational plasticity of the hCD81LEL head subdomain is a molecular property of the receptor. The observed closed, intermediate, and open conformations of the head subdomain provide distinct binding platforms. Simulations at pH 7.4 and 4.0 indicate that this dynamism is pH modulated. The crystallized double conformation of the disulfide bridge C157-C175 at the base of the head subdomain identifies this bond as the molecular zipper of the plasticity of hCD81LEL. We propose that this conformational dependence of hCD81LEL, which is finely tuned by pH and redox conditions, enables the virus-receptor interactions to diversely re-engage at endosomal conditions. Mechanism of Structural Tuning of the Hepatitis C Virus Human Cellular Receptor CD81 Large Extracellular Loop.,Cunha ES, Sfriso P, Rojas AL, Hospital A, Orozco M, Abrescia NG Structure. 2016 Nov 21. pii: S0969-2126(16)30343-4. doi:, 10.1016/j.str.2016.11.003. PMID:27916518 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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