1DVV

SOLUTION STRUCTURE OF THE QUINTUPLE MUTANT OF CYTOCHROME C-551 FROM PSEUDOMONAS AERUGINOSA

Summary for 1DVV

• Entry DOI: 10.2210/pdb1dvv/pdb
• Descriptor: CYTOCHROME C551, PROTOPORPHYRIN IX CONTAINING FE (2 entities in total)
• Functional Keywords: cytochrome c, stability, electron transport
• Biological source: Pseudomonas aeruginosa
• Cellular location: Periplasm: P00099
• Total number of polymer chains: 1
• Total formula weight: 9341.43

Authors

Hasegawa, J.,Uchiyama, S.,Tanimoto, Y.,Mizutani, M.,Kobayashi, Y.,Sambongi, Y.,Igarashi, Y. (deposition date: 2000-01-22, release date: 2000-11-29, Last modification date: 2024-04-10)

Primary citation

Hasegawa, J.,Uchiyama, S.,Tanimoto, Y.,Mizutani, M.,Kobayashi, Y.,Sambongi, Y.,Igarashi, Y.
Selected mutations in a mesophilic cytochrome c confer the stability of a thermophilic counterpart.
J.Biol.Chem., 275:37824-37828, 2000

PubMed Abstract: Mesophilic 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.

PubMed: 10918067
DOI: 10.1074/jbc.M005861200

Experimental method

SOLUTION NMR