1MM9
Streptavidin Mutant with Insertion of Fibronectin Hexapeptide, including RGD
Summary for 1MM9
| Entry DOI | 10.2210/pdb1mm9/pdb |
| Related | 1MEP 1MK5 1SWE |
| Descriptor | Streptavidin, (4R)-2-METHYLPENTANE-2,4-DIOL (3 entities in total) |
| Functional Keywords | tetramer, biotin-binding protein |
| Biological source | Streptomyces avidinii |
| Cellular location | Secreted: P22629 |
| Total number of polymer chains | 1 |
| Total formula weight | 13800.99 |
| Authors | Le Trong, I.,McDevitt, T.C.,Nelson, K.E.,Stayton, P.S.,Stenkamp, R.E. (deposition date: 2002-09-03, release date: 2003-05-06, Last modification date: 2024-02-14) |
| Primary citation | Le Trong, I.,McDevitt, T.C.,Nelson, K.E.,Stayton, P.S.,Stenkamp, R.E. Structural characterization and comparison of RGD cell-adhesion recognition sites engineered into streptavidin. Acta Crystallogr.,Sect.D, 59:828-834, 2003 Cited by PubMed Abstract: The RGD (arginine-glycine-aspartic acid) sequence is found in several important extracellular matrix proteins and serves as an adhesion ligand for members of the integrin family of cell-surface receptors. This sequence and flanking residues from fibronectin or osteopontin have been engineered into an accessible surface loop of streptavidin to create two new streptavidin variants (FN-SA or OPN-SA, respectively) that bind cells through the alpha(v)beta(3) and/or alpha(5)beta(1) integrin receptors. Their crystal structures confirm the design and construction of the mutants and provide evidence about the conformational dynamics of the RGD loops. The loops in the isomorphous crystal structures are involved in crystal-packing interactions and this stabilizes their structures. Even so, the loop in OPN-SA is slightly disordered and two of the residues are not seen in difference electron-density maps. Comparison with other experimentally determined structures of RGD loops in cell-adhesion molecules shows that these loops occupy a large subset of conformational space. This is consistent with the view that RGD loops, at least those involved in cell adhesion, sample a number of structures dynamically, a few of which display high affinity for appropriate receptors. PubMed: 12777798DOI: 10.1107/S0907444903004153 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.66 Å) |
Structure validation
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