1UUR

Structure of an activated Dictyostelium STAT in its DNA-unbound form

1UUR の概要

• エントリーDOI: 10.2210/pdb1uur/pdb
• 関連するPDBエントリー: 1UUS
• 分子名称: STATA PROTEIN (2 entities in total)
• 機能のキーワード: transcription activator, dictyostelium, stat, sh2, signal transduction, transducer, transcription factor
• 由来する生物種: DICTYOSTELIUM DISCOIDEUM (SLIME MOLD)
• 細胞内の位置: Cytoplasm: O00910
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 53376.73

構造登録者

Soler-Lopez, M.,Petosa, C.,Fukuzawa, M.,Ravelli, R.,Williams, J.G.,Muller, C.W. (登録日: 2004-01-09, 公開日: 2004-03-26, 最終更新日: 2024-11-20)

主引用文献

Soler-Lopez, M.,Petosa, C.,Fukuzawa, M.,Ravelli, R.,Williams, J.G.,Muller, C.W.
Structure of an Activated Dictyostelium Stat in its DNA-Unbound Form
Mol.Cell, 13:791-, 2004

PubMed Abstract: Dd-STATa is a STAT protein which transcriptionally regulates cellular differentiation in Dictyostelium discoideum, the only non-metazoan known to employ SH2 domain signaling. The 2.7 A crystal structure of a tyrosine phosphorylated Dd-STATa homodimer reveals a four-domain architecture similar to that of mammalian STATs 1 and 3, but with an inverted orientation for the coiled-coil domain. Dimerization is mediated by SH2 domain:phosphopeptide interactions and by a direct interaction between SH2 domains. The unliganded Dd-STATa dimer adopts a fully extended conformation remarkably different from that of the DNA-bound mammalian STATs, implying a large conformational change upon target site recognition. Buried hydrophilic residues predicted to destabilize the coiled-coil domain suggest how hydrophobic residues may become exposed and mediate nuclear export. Functional and evolutionary implications for metazoan STAT proteins are discussed.

PubMed: 15053873
DOI: 10.1016/S1097-2765(04)00130-3

実験手法

X-RAY DIFFRACTION (2.7 Å)