1A1E

C-SRC (SH2 DOMAIN) COMPLEXED WITH ACE-PHOSPHOTYR-GLU-(3-BUTYLPIPERIDINE)

1A1E の概要

• エントリーDOI: 10.2210/pdb1a1e/pdb
• 分子名称: C-SRC TYROSINE KINASE, ACE-PHOSPHOTYR-GLU-(3-BUTYLPIPERIDINE) (3 entities in total)
• 機能のキーワード: complex (transferase-peptide), complex (transferase-peptide) complex, complex (transferase/peptide)
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cell membrane : P12931
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 25686.89

構造登録者

Shewchuk, L.,Jordan, S. (登録日: 1997-12-10, 公開日: 1998-04-08, 最終更新日: 2024-10-30)

主引用文献

Charifson, P.S.,Shewchuk, L.M.,Rocque, W.,Hummel, C.W.,Jordan, S.R.,Mohr, C.,Pacofsky, G.J.,Peel, M.R.,Rodriguez, M.,Sternbach, D.D.,Consler, T.G.
Peptide ligands of pp60(c-src) SH2 domains: a thermodynamic and structural study.
Biochemistry, 36:6283-6293, 1997

PubMed Abstract: Thermodynamic measurements, structural determinations, and molecular computations were applied to a series of peptide ligands of the pp60(c-src) SH2 domain in an attempt to understand the critical binding determinants for this class of molecules. Isothermal titration calorimetry (ITC) measurements were combined with structural data derived from X-ray crystallographic studies on 12 peptide-SH2 domain complexes. The peptide ligands studied fall into two general classes: (1) dipeptides of the general framework N-acetylphosphotyrosine (or phosphotyrosine replacement)-Glu or methionine (or S-methylcysteine)-X, where X represents a hydrophobic amine, and (2) tetra- or pentapeptides of the general framework N-acetylphosphotyrosine-Glu-Glu-Ile-X, where X represents either Glu, Gln, or NH2. Dipeptide analogs which featured X as either hexanolamine or heptanolamine were able to pick up new hydrogen bonds involving their hydroxyl groups within a predominantly lipophilic surface cavity. However, due to internal strain as well as the solvent accessibility of the new hydrogen bonds formed, no net increase in binding affinity was observed. Phosphatase-resistant benzylmalonate and alpha,alpha-difluorobenzyl phosphonate analogs of phosphotyrosine retained some binding affinity for the pp60(c-src) SH2 domain but caused local structural perturbations in the phosphotyrosine-binding site. In the case where a reversible covalent thiohemiacetal was formed between a formylated phosphotyrosine analog and the thiol side chain of Cys-188, deltaS was 25.6 cal/(mol K) lower than for the nonformylated phosphotyrosine parent. Normal mode calculations show that the dramatic decrease in entropy observed for the covalent thiohemiacetal complex is due to the inability of the phosphotyrosine moiety to transform lost rotational and translational degrees of freedom into new vibrational modes.

PubMed: 9174343
DOI: 10.1021/bi970019n

実験手法

X-RAY DIFFRACTION (2.2 Å)