5xed
Heterodimer constructed from M61A PA cyt c551-HT cyt c552 and HT cyt c552-PA cyt c551 chimeric proteinsHeterodimer constructed from M61A PA cyt c551-HT cyt c552 and HT cyt c552-PA cyt c551 chimeric proteins
Structural highlights
FunctionCY552_HYDTT Reacts with hydrogenase.CY551_PSEAE Electron donor for cytochrome cd1 in nitrite and nitrate respiration. Publication Abstract from PubMedThe design of protein oligomers with multiple active sites has been gaining interest, owing to their potential use for biomaterials, which has encouraged researchers to develop a new design method. Three-dimensional domain swapping is the unique phenomenon in which protein molecules exchange the same structural region between each other. Herein, to construct oligomeric heme proteins with different active sites by utilizing domain swapping, two c-type cytochrome-based chimeric proteins have been constructed and the domains swapped. According to X-ray crystallographic analysis, the two chimeric proteins formed a domain-swapped dimer with two His/Met coordinated hemes. By mutating the heme coordination structure of one of the two chimeric proteins, a domainswapped heterodimer with His/Met and His/H2 O coordinated hemes was formed. Binding of an oxygen molecule to the His/H2 O site of the heterodimer was confirmed by resonance Raman spectroscopy, in which the Fe-O2 stretching band was observed at 580 cm-1 for the reduced/oxygenated heterodimer (at 554 cm-1 under an 18 O2 atmosphere). These results show that domain swapping is a useful method to design multiheme proteins. Rational Design of Domain-Swapping-Based c-Type Cytochrome Heterodimers by Using Chimeric Proteins.,Zhang M, Nakanishi T, Yamanaka M, Nagao S, Yanagisawa S, Shomura Y, Shibata N, Ogura T, Higuchi Y, Hirota S Chembiochem. 2017 Jun 28. doi: 10.1002/cbic.201700219. PMID:28660650[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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