1d9c
From Proteopedia
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|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1hig|1HIG]], [[1rfb|1RFB]], [[2rig|2RIG]], [[1d9g|1D9G]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1d9c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1d9c OCA], [http://www.ebi.ac.uk/pdbsum/1d9c PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1d9c RCSB]</span> | ||
}} | }} | ||
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[[Category: helical homodimer]] | [[Category: helical homodimer]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:37:13 2008'' |
Revision as of 16:37, 30 March 2008
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| , resolution 2.0Å | |||||||
|---|---|---|---|---|---|---|---|
| Related: | 1HIG, 1RFB, 2RIG, 1D9G
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
BOVINE INTERFERON-GAMMA AT 2.0 ANGSTROMS
Overview
The structure of bovine interferon-gamma (IFN-gamma) was determined by multiple isomorphous replacement at 2.0 A resolution. Bovine IFN-gamma crystallizes in two related crystal forms. Crystal form 1 diffracts to 2.9 A resolution and is reproducible and stable to derivatization. Crystal form 2 diffracts to 2.0 A resolution, but shows significant non-isomorphism from crystal to crystal. The previously determined structures of several different species of INF-gamma were either at too low a resolution [human, 1hig; Ealick et al. (1991), Science, 252, 698-702] or were too inaccurate [bovine, 1rfb; Samudzi & Rubin (1993), Acta Cryst. D49(6), 505-512; rabbit, 2rig; Samudzi et al. (1991), J. Biol. Chem. 266(32), 21791-21797] for the structure to be solved by molecular replacement. The structure was solved in crystal form 1 using two derivatives produced by chemically modifying two free cysteine residues that were introduced by site-directed mutagenesis (Ser30Cys, Asn59Cys). After model building and refinement, the final R value was 21.8% (R(free) = 30.9%) for all data in the resolution range 8.0-2.9 A. The crystal form 1 structure was then used as a molecular-replacement model for crystal form 2 data collected from a flash-cooled crystal. Subsequent model building and refinement, using all data in the resolution range 15.0-2.0 A, gave an R value of 19.7% and an R(free) of 27.5%. Pairwise comparison of C(alpha) positions of bovine IFN-gamma (BOV) and the previously determined 1rfb and 2rig structures indicated some significant differences in the models (r.m.s.d. values for BOV to 1rfb, 4.3 A; BOV to 2rig, 4.0 A). An assessment of the quality of the structures was made using the 3D-1D algorithm [Eisenberg et al. (1992), Faraday Discuss. 93, 25-34]. The resulting statistical scoring indicated that BOV was consistent with expected criteria for a 2.0 A structure, whereas both 1rfb and 2rig fell below acceptable criteria.
About this Structure
1D9C is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.
Reference
The 2.0 A structure of bovine interferon-gamma; assessment of the structural differences between species., Randal M, Kossiakoff AA, Acta Crystallogr D Biol Crystallogr. 2000 Jan;56(Pt 1):14-24. PMID:10666622
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