2pi3
The crystal structure of OspA mutantThe crystal structure of OspA mutant
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedSite-directed mutagenesis is a powerful tool for altering the structure and function of proteins in a focused manner. Here, we examined how a model beta-sheet protein could be tuned by mutation of numerous surface-exposed residues to aromatic amino acids. We designed these aromatic side chain "clusters" at highly solvent-exposed positions in the flat, single-layer beta-sheet of Borrelia outer surface protein A (OspA). This unusual beta-sheet scaffold allows us to interrogate the effects of these mutations in the context of well-defined structure but in the absence of the strong scaffolding effects of globular protein architecture. We anticipated that the introduction of a cluster of aromatic amino acid residues on the beta-sheet surface would result in large conformational changes and/or stabilization and thereby provide new means of controlling the properties of beta-sheets. Surprisingly, X-ray crystal structures revealed that the introduction of aromatic clusters produced only subtle conformational changes in the OspA beta-sheet. Additionally, despite burying a large degree of hydrophobic surface area, the aromatic cluster mutants were slightly less stable than the wild-type scaffold. These results thereby demonstrate that the introduction of aromatic cluster mutations can serve as a means for subtly modulating beta-sheet conformation in protein design. Aromatic cluster mutations produce focal modulations of beta-sheet structure.,Biancalana M, Makabe K, Yan S, Koide S Protein Sci. 2015 May;24(5):841-9. doi: 10.1002/pro.2657. Epub 2015 Mar 25. PMID:25645104[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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