Download MendeleyX-ray structure of a truncated form of cytochrome f from chlamydomonas reinhardtii.
Chi, Y.I., Huang, L.S., Zhang, Z., Fernandez-Velasco, J.G., Berry, E.A.(2000) Biochemistry 39: 7689-7701
- PubMed: 10869174
- DOI: https://doi.org/10.1021/bi000090k
- Primary Citation of Related Structures:
1CFM - PubMed Abstract:
A truncated form of cytochrome f from Chlamydomonas reinhardtii (an important eukaryotic model organism for photosynthetic electron transfer studies) has been crystallized (space group P2(1)2(1)2(1); three molecules/asymmetric unit) and its structure determined to 2.0 A resolution by molecular replacement using the coordinates of a truncated turnip cytochrome f as a model. The structure displays the same folding and detailed features as turnip cytochrome f, including (a) an unusual heme Fe ligation by the alpha-amino group of tyrosine 1, (b) a cluster of lysine residues (proposed docking site of plastocyanin), and (c) the presence of a chain of seven water molecules bound to conserved residues and extending between the heme pocket and K58 and K66 at the lysine cluster. For this array of waters, we propose a structural role. Two cytochrome f molecules are related by a noncrystallographic symmetry operator which is a distorted proper 2-fold rotation. This may represent the dimeric relation of the monomers in situ; however, the heme orientation suggested by this model is not consistent with previous EPR measurements on oriented membranes.
Organizational Affiliation:
Department of Chemistry, University of California, Berkeley, California 94720, USA.
