Iron-sulfur clusters and protein structure of Azotobacter ferredoxin at 2.0 A resolution.
Iron-sulfur clusters and protein structure of Azotobacter ferredoxin at 2.0 A resolution.
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2.0 A 分辨率下的铁硫簇和固氮菌铁氧化还原蛋白的蛋白质结构。
DOI:
10.1016/0022-2836(82)90451-x
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发表时间:
1982
影响因子:
5.6
通讯作者:
Stout,CD
中科院分区:
文献类型:
--
作者:
Ghosh,D;O'Donnell,S;FureyJr,W;Robbins,AH;Stout,CD
Details of the structures of the [3Fe-3S] and [4Fe-4S] clusters in Azotobacter ferredoxin are presented. The structures are derived from crystallographic refinement of the protein structure (106 amino acids, 12,680 M r. X-ray diffraction data were collected using the tetragonal crystal form, space group P4 3 2 1 2, a= 55· 22 A ̊, c= 95· 20 A ̊, Z= 1 and V m= 2· 86 A ̊ 3/dalton. The structure has been refined using the restrained least-squares method of Hendrickson & Konnert (1980). The R value is 0· 262 for 1199 Fe, S, protein and water oxygen atoms with a Δd rms from ideality for bond distances of 0· 032 Å. The refinement reveals an extensive water structure; 344 water oxygens out of approximately 740 in the asymmetric unit have been refined with B⩽ 40 A ̊ 2. The composition of the 3Fe center is refined as [3Fe-3S](S γ) 5 (Oxo). The sixth, non-cysteinyl and non-protein ligand to iron, Oxo, refines as a solvent oxygen (water or hydroxyl) and is not the side-chain of glutamate 18. The cluster displays a slightly puckered twist-boat conformation with distorted tetrahedral co-ordination about each Fe center. Displacements of inorganic sulfur from the plane of the three Fe atoms are+ 0· 2,+ 0· 5 and− 0· 5 Å. The Fe… Fe distances are 4· 18, 4· 08 and 3· 97 Å, with a standard deviation of σ 1∼-0· 1 A ̊. Angles at inorganic sulfur are 131°, 126°, 113°, with σ a= 5°. The [4Fe-4S](S γ) 4 cluster has average bond distances and angles and interatomic dimensions similar to the [4Fe-4S](S γ) 4 clusters in high-potential iron protein (Carter, 1977a), and Peptococcus aerogenes ferredoxin (Adman et al., 1976). The Fe-S core appears to display compression about a 4 ̄ axis analogous to that observed for [4Fe-4S] 2+ protein clusters and [Fe 4 S 4] 2+ synthetic analog clusters (Holm & Ibers. 1977). A description of the protein structure is given in terms of symmetry or asymmetry in the polypeptide folding, Fe-S cluster ligation, charge distribution, and hydration by the water structure. The intramolecular (hydrogen-bonding) and intermolecular (crystal packing) interactions are summarized. The protein environments of the Fe-S clusters are described.
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DOI:
--
发表时间:
1980
期刊:
European Journal of Biochemistry
影响因子:
--
作者:
J. Walker;A. Wonacott;J. Harris
通讯作者:
J. Harris
DOI:
10.1016/0005-2728(81)90047-5
发表时间:
1981
期刊:
Biochimica et Biophysica Acta
影响因子:
--
作者:
A. Thomson;A. Robinson;Michael K. Johnson;R. Cammack;K. Rao;D. Hall
通讯作者:
D. Hall
DOI:
--
发表时间:
1973
期刊:
Biochimica et Biophysica Acta
影响因子:
--
作者:
V. K. Shah;W. Brill
通讯作者:
W. Brill
影响因子:
4.8
作者:
J. Newton;P. W. Wilson;R. Burris
通讯作者:
R. Burris
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
J. Hanson;K. Watenpaugh;L. Sieker;L. H. Jensen
通讯作者:
L. H. Jensen