User:Czeer/sandbox 5
Facts
[edit]- Azurin is a blue copper protein. The blue copper proteins are redox active,[1] and bright blue due to an electron transfer to the metal centre (citation?).
- Azurin homologues have similar structures, however different redox potentials.[2]
- Pseudomonas aeruginosa is a small 128 residue copper binding protein. [1]
- In P aeruginosa azurin, the electron transfer that gives rise to the bright blue colour is thought to arise partly from a structural disulfide bond near the redox active copper..[2]
- Azurin might enable electron transfer to different systems, including "denitrification and/or respiratory chains", and possibly in response to oxidative stress.[1]
- One alpha helix, with eight beta-strands that fold into two beta sheets with a greek key beta barrel topology.[1][2]
- In P. aeruginosa copper is coordinated in an trigonal bipyramidal geometry, equatorially through two histidine and a cysteine residue, and axially through a methionine and main-chain carbonyl residue.[1]
- P aeruginosa absorbs at 625 nm (ε=5, 700 M-1 cm-1) and 410 nm (ε=10,000 M-1cm-1) [2]
http://onlinelibrary.wiley.com/doi/10.1002/advs.201400026/references
http://link.springer.com/article/10.1007%2Fs007750000146
Azurin is a bacterial blue copper protein found in Pseudomonas, Bordetella, or Alcaligenes bacteria, which undergoes oxidation-reduction between Cu(I) and Cu(II), and transfers single electrons between enzymes associated with the cytochrome chain. The protein has a molecular weight of approximately 16,000, contains a single copper atom, is intensively blue, and has a fluorescence emission band centered at 308nm.
Azurins and pseudoazurins participate in denitrification processes in bacteria.[3]
Azurin and cytochrome c551 are involved in electron transfer during denitrification in P. aeruginosa. Azurin from P aeruginosa is a type I blue copper protein with a molecular mass of 14 kDa, while cytochrome c551 (9 kDa) is a haem-containing cytochrome. Azurin possesses a relatively large hydrophobic patch close to the active site, and two residues in this hydrophobic patch, Met-44 and Met-64, are believed to be involved in its interaction with the redox partners cytochrome c551 and nitrite reductase[4]
See also
[edit]References
[edit]- ^ a b c d e Pozdnyakova, Irina; Wittung-Stafshede, Pernilla (2011). Gomes, Cláudio M. (ed.). Protein folding and metal ions mechanisms, biology and disease. Boca Raton, FL: CRC Press. pp. 61–76. ISBN 1439809658. Retrieved 30 March 2016.
- ^ a b c d Farver, Ole; Pecht, Israel (2007). Karlin, Kenneth D. (ed.). Progress in inorganic chemistry. Hoboken, N.J.: Wiley. pp. 8–23. ISBN 0470144416.
- ^ De Rienzo F, Gabdoulline RR, Menziani MC, Wade RC (2000). "Blue copper proteins: a comparative analysis of their molecular interaction properties". Protein Sci. 9 (8): 1439–54. doi:10.1110/ps.9.8.1439. PMID 10975566.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Tohru Yamada,1 Masatoshi Goto,1 Vasu Punj, Olga Zaborina, Kazuhide Kimbara, T. K. Das Gupta,and A. M. Chakrabarty1 (Dec 2002). "The Bacterial Redox Protein Azurin Induces Apoptosis in J774 Macrophages through Complex Formation and Stabilization of the Tumor Suppressor Protein p53". Infect Immun. 70 (12): 7054–7062. doi:10.1128/IAI.70.12.7054-7062.2002. PMC 133031. PMID 12438386.
{{cite journal}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)