2rhp
From Proteopedia
The Thrombospondin-1 Polymorphism Asn700Ser Associated with Cornoary Artery Disease Causes Local and Long-Ranging Changes in Protein Structure
Structural highlights
Disease[TSP2_HUMAN] Genetic variations in THBS2 may be a cause of susceptibility to intervertebral disk disease (IDD) [MIM:603932]; also known as lumbar disk herniation (LDH). IDD is one of the most common musculo-skeletal disorders and the predominant cause of low-back pain and unilateral leg pain.[1] Function[TSP2_HUMAN] Adhesive glycoprotein that mediates cell-to-cell and cell-to-matrix interactions. Ligand for CD36 mediating antiangiogenic properties.[2] 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 PubMedThrombospondins (THBSs) are multimodular, secreted proteins characterized by a signature domain comprising a unique set of 13 calcium-binding repeats flanked by epidermal growth factor (EGF)-like and lectin-like modules. A polymorphism that changes a conserved Asn to Ser at residue 700 in the most N-terminal calcium-binding repeat of THBS-1 (repeat 1C) is found in 8-10% of European populations and has been linked to increased risk of premature coronary artery disease. The Ser substitution leads to altered stability in the EGF-like and wire modules of the THBS-1 signature domain as assessed by differential scanning calorimetry carried out in 2 mm or 200 mum calcium. Studies of the melting profiles of the THBS-2 signature domain proteins with Asn or Ser at position 702 (homologous to 700 in THBS-1) revealed that the impact of the Ser allele is similar in both THBS-1 and THBS-2. Structure determination of the Ser(702) THBS-2 variant in 2 mm calcium showed that repeat 1C contains two bound calcium ions as in the crystal of the Asn(702) protein, including the ion that is coordinated by Asn(702), and is associated with changes in conformation of repeat 1C and the adjacent EGF-like modules. The Ser substitution leads to the decreased ability of soluble THBS-2 signature domain protein to bind 4B6.13, a conformation-sensitive monoclonal antibody that recognizes an epitope in repeat 1C. These results indicate that although THBS harboring the Ser allele binds a full complement of calcium ions, repeat 1C is altered, leading to destabilization of surrounding structures. Influences of the N700S thrombospondin-1 polymorphism on protein structure and stability.,Carlson CB, Liu Y, Keck JL, Mosher DF J Biol Chem. 2008 Jul 18;283(29):20069-76. Epub 2008 May 22. PMID:18499674[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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