2mf6
Solution NMR structure of Chimeric Avidin, ChiAVD(I117Y), in the biotin bound formSolution NMR structure of Chimeric Avidin, ChiAVD(I117Y), in the biotin bound form
Structural highlights
FunctionAVR4_CHICK AVID_CHICK The biological function of avidin is not known. Forms a strong non-covalent specific complex with biotin (one molecule of biotin per subunit of avidin). Publication Abstract from PubMedChimeric avidin (ChiAVD) is a product of rational protein engineering remarkably resistant to heat and harsh conditions. In quest of the fundamentals behind factors affecting stability we have elucidated the solution NMR spectroscopic structure of the biotin-bound form of ChiAVD and characterized the protein dynamics through 15N relaxation and hydrogen/deuterium (H/D) exchange of this and the biotin-free form. To surmount the challenges arising from the very large size of the protein for NMR spectroscopy, we took advantage of its high thermostability. Conventional triple resonance experiments for fully protonated proteins combined with methyl-detection optimized experiments acquired at 58 degrees C were adequate for the structure determination of this 56 kDa protein. The model-free parameters derived from the 15N relaxation data reveal a remarkably rigid protein at 58 degrees C in both the biotin-bound and the free forms. The H/D exchange experiments indicate a notable increase in hydrogen protection upon biotin binding. Chimeric Avidin--NMR structure and dynamics of a 56 kDa homotetrameric thermostable protein.,Tossavainen H, Kukkurainen S, Maatta JA, Kahkonen N, Pihlajamaa T, Hytonen VP, Kulomaa MS, Permi P PLoS One. 2014 Jun 24;9(6):e100564. doi: 10.1371/journal.pone.0100564., eCollection 2014. PMID:24959850[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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