1ccr
From Proteopedia
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STRUCTURE OF RICE FERRICYTOCHROME C AT 2.0 ANGSTROMS RESOLUTION
Overview
The crystal structure of ferricytochrome c from rice embryos has been, solved by X-ray diffraction to a resolution of 2.0 A, applying a single, isomorphous replacement method with anomalous scattering effects. The, initial molecular model was built on a graphics display system and was, refined by the Hendrickson and Konnert method. The R factor was reduced to, 0.25. Rice cytochrome c consists of III amino acid residues. In comparison, with animal cytochromes c, the peptide chain extends for eight residues at, the N-terminal end, which is characteristic for plant cytochromes c. These, additional residues display a collagen-like conformation and an irregular, reverse turn, and are located around the C-terminal alpha-helix on the, surface or the rear side of the molecule. Two hydrogen bonds between the, carbonyl oxygen of the N-terminal acetyl group and O eta of Tyr65, and, between the peptide carbonyl oxygen of Pro-1 and O epsilon 1 of Gln89, are, involved in holding these eight residues on the molecular surface, where, Tyr65 and Gln89 are invariant in plant cytochromes c. Except for the extra, eight residues, the main-chain conformations of both rice and tuna, cytochromes c are essentially identical, though small local conformational, differences are found at residues 24, 25, 56 and 57.
About this Structure
1CCR is a Single protein structure of sequence from Oryza sativa with ACE, HEM and TML as ligands. Full crystallographic information is available from OCA.
Reference
Structure of rice ferricytochrome c at 2.0 A resolution., Ochi H, Hata Y, Tanaka N, Kakudo M, Sakurai T, Aihara S, Morita Y, J Mol Biol. 1983 May 25;166(3):407-18. PMID:6304326
Page seeded by OCA on Tue Nov 20 12:21:16 2007
Categories: Oryza sativa | Single protein | Aihara, S. | Hata, Y. | Kakudo, M. | Morita, Y. | Ochi, H. | Sakurai, T. | Tanaka, N. | ACE | HEM | TML | Electron transport(cytochrome)
