2iue

Pactolus I-domain: Functional Switching of the Rossmann Fold

spinqualitylabelsall models 2iue Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2iue is a 1 chain structure with sequence from Mus musculus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ITB2L_MOUSE During inflammatory stimulation, plays a role in retaining Cxcl13-expressing cells at the site of the inflammatory response. 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 Murine Pactolus is a neutrophil-specific single chain glycoprotein that plays a role as an apoptosis marker for macrophages. The extracellular region of the protein shows strong sequence similarities to integrin beta-subunits. Critical sequence modifications differentiate its function when compared to the integrin family. We show experimentally that Pactolus I-domain does not bind divalent metal ions, indicating that ligand binding is not mediated through a metal ion-dependent adhesion site (MIDAS). NMR data was used to map secondary structure and the strand pairing within the beta-sheet to confirm an overall Rossmann fold topology. Homology modeling enhanced by the NMR data was used to determine the overall structure, with two key loop insertions/deletions (insertion 2 and SDL) that distinguish the Pactolus I-domain from the integrin alpha I-domain and beta I-domains. NMR peak exchange broadening is observed due to dimerization, correlating to the beta I-domain and beta propeller heterodimerization region within the integrin headpiece. Two unique N-linked glycosylation sites (Asn151 and Asn230) within this region disrupt dimerization and may account for why Pactolus is not found to associate with an alpha-subunit. These changes in quaternary structure, ligand binding loops, glycosylation, and metal sites illustrate how evolution has rapidly and effectively altered key aspects of the integrin beta-subunit to derive a protein of novel function on an existing protein scaffold. Pactolus I-domain: functional switching of the Rossmann fold.,Sen M, Legge GB Proteins. 2007 Aug 15;68(3):626-35. PMID:17523188 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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