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SOLUTION STRUCTURE OF THE QUINTUPLE MUTANT OF CYTOCHROME C-551 FROM PSEUDOMONAS AERUGINOSASOLUTION STRUCTURE OF THE QUINTUPLE MUTANT OF CYTOCHROME C-551 FROM PSEUDOMONAS AERUGINOSA
Structural highlights
Function[CY551_PSEAE] Electron donor for cytochrome cd1 in nitrite and nitrate respiration. 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 PubMedMesophilic cytochrome c(551) of Pseudomonas aeruginosa (PA c(551)) became as stable as its thermophilic counterpart, Hydrogenobacter thermophilus cytochrome c(552) (HT c(552)), through only five amino acid substitutions. The five residues, distributed in three spatially separated regions, were selected and mutated with reference to the corresponding residues in HT c(552) through careful structure comparison. Thermodynamic analysis indicated that the stability of the quintuple mutant of PA c(551) could be partly attained through an enthalpic factor. The solution structure of the mutant showed that, as in HT c(552), there were tighter side chain packings in the mutated regions. Furthermore, the mutant had an increased total accessible surface area, resulting in great negative hydration free energy. Our results provide a novel example of protein stabilization in that limited amino acid substitutions can confer the overall stability of a natural highly thermophilic protein upon a mesophilic molecule. Selected mutations in a mesophilic cytochrome c confer the stability of a thermophilic counterpart.,Hasegawa J, Uchiyama S, Tanimoto Y, Mizutani M, Kobayashi Y, Sambongi Y, Igarashi Y J Biol Chem. 2000 Dec 1;275(48):37824-8. PMID:10918067[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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