Structure of rice ferricytochrome c at 2.0 A resolution.Ochi, H., Hata, Y., Tanaka, N., Kakudo, M., Sakurai, T., Aihara, S., Morita, Y.
(1983) J.Mol.Biol. 166: 407-418
- PubMed: 6304326
- PubMed Abstract:
- Amino Acid Sequence of Cytochrome C from Rice
Mori, E.,Morita, Y.
(1980) J.Biochem.(Tokyo) 87: 249
- Studies on Respiratory Enzymes in Rice Kernel. Part I. Isolation and Purification of Cytochrome C and Peroxidase 556 from Rice Embryo
Mori, Y.,Ida, S.
(1968) Agric.Biol.Chem. 32: 441
- A Preliminary Crystallographic Investigation of Rice Cytochrome C
Morita, Y.,Ida, S.
(1972) J.Mol.Biol. 71: 807
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 ...
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.