1HNC

CRYSTAL STRUCTURE OF HUMAN CLASS MU GLUTATHIONE TRANSFERASE GSTM2-2: EFFECTS OF LATTICE PACKING ON CONFORMATIONAL HETEROGENEITY

1HNC の概要

• エントリーDOI: 10.2210/pdb1hnc/pdb
• 分子名称: GLUTATHIONE S-TRANSFERASE, GLUTATHIONE S-(2,4 DINITROBENZENE) (2 entities in total)
• 機能のキーワード: transferase(glutathione)
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cytoplasm: P28161
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 104319.35

構造登録者

Raghunathan, S.,Chandross, R.J.,Kretsinger, R.H.,Allison, T.J.,Penington, C.J.,Rule, G.S. (登録日: 1993-10-15, 公開日: 1994-01-31, 最終更新日: 2024-02-07)

主引用文献

Raghunathan, S.,Chandross, R.J.,Kretsinger, R.H.,Allison, T.J.,Penington, C.J.,Rule, G.S.
Crystal structure of human class mu glutathione transferase GSTM2-2. Effects of lattice packing on conformational heterogeneity.
J.Mol.Biol., 238:815-832, 1994

PubMed Abstract: The structures of three crystal forms of the class mu human glutathione transferase GSTM2-2 have been determined. X-ray phase information was obtained independently from molecular replacement and from anomalous scattering by a single isomorphous derivative. One crystal form contains a single monomer in the asymmetric unit and has been refined to 1.85 A with an overall R factor of 22.6%. The second form contains a single dimer in the asymmetric unit and has been refined to 3.5 A with an R factor of 20.7%. The third form contains two dimers in the asymmetric unit and has been refined to 3.0 A with an R factor of 25.0%. Although all three crystal forms were grown from solutions that contained glutathione-dinitrobenzene, electron density can only be seen for the glutathione portion of the ligand. The first 202 residues in the seven crystallographically independent monomers of GSTM2-2 are essentially identical in structure. However, heterogeneity in the conformation of the side-chain of Tyr115 is observed in the different monomers. The tertiary structure of residues 1-202 is similar to that of the corresponding region in the class mu isoform of glutathione transferase from rat, GST3-3 (Ji et al. (1992), Biochemistry, 31, 10169-10184). However, significant differences in the conformation of the two enzymes have been observed in the region of the active site that binds hydrophobic substrates. These differences include a 2 A shift in the carboxy terminus of a helix, and significant heterogeneity in the conformation of the last 15 residues of the carboxy terminus. The conformation and degree of disorder of the last 15 residues correlates with the extent of protein-protein contacts within the unit cell.

PubMed: 8182750
DOI: 10.1006/jmbi.1994.1336

実験手法

X-RAY DIFFRACTION (3 Å)