1dgu
From Proteopedia
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HOMOLOGY-BASED MODEL OF CALCIUM-SATURATED CIB (CALCIUM-AND INTEGRIN-BINDING PROTEIN)
Contents |
Overview
Calcium- and integrin-binding protein (CIB) binds to the 20-residue, alphaIIb cytoplasmic domain of platelet alphaIIbbeta3 integrin. Amino acid, sequence similarities with calmodulin (CaM) and calcineurin B (CnB), allowed the construction of homology-based models of calcium-saturated CIB, as well as apo-CIB. In addition, the solution structure of the alphaIIb, cytoplasmic domain in 45% aqueous trifluoroethanol was solved by, conventional two-dimensional NMR methods. The models indicate that the, N-terminal domain of CIB possesses a number of positively charged residues, in its binding site that could interact with the acidic carboxy-terminal, LEEDDEEGE sequence of alphaIIb. The C-terminal domain of CIB seems, well-suited to bind the sequence WKVGFFKR, which forms a well-structured, alpha helix; this is analogous to calmodulin and calcineurin B, which also, bind alpha helices. Similarities between the C-terminal domains of CIB and, calmodulin suggest that binding of CIB to the cytoplasmic domain of, alphaIIb may be affected by fluctuations in the intracellular calcium, concentration.
Disease
Known disease associated with this structure: Multiple endocrine neoplasia, type IV OMIM:[600778]
About this Structure
1DGU is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structures of the platelet calcium- and integrin-binding protein and the alphaIIb-integrin cytoplasmic domain suggest a mechanism for calcium-regulated recognition; homology modelling and NMR studies., Hwang PM, Vogel HJ, J Mol Recognit. 2000 Mar-Apr;13(2):83-92. PMID:10822252
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