4ATI

MITF:M-box complex

4ATI の概要

• エントリーDOI: 10.2210/pdb4ati/pdb
• 関連するPDBエントリー: 4ATH 4ATK
• 分子名称: MICROPHTHALMIA-ASSOCIATED TRANSCRIPTION FACTOR, 5'-D(*GP*TP*TP*AP*GP*CP*AP*CP*AP*TP*GP*AP*CP*CP*CP*T)-3', 5'-D(*AP*GP*GP*GP*TP*CP*AP*TP*GP*TP*GP*CP*TP*AP*AP*C)-3', ... (4 entities in total)
• 機能のキーワード: dna-binding protein-dna complex, melanoma, dna-binding protein/dna
• 由来する生物種: MUS MUSCULUS (HOUSE MOUSE); 詳細
• 細胞内の位置: Nucleus: Q08874
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 37982.84

構造登録者

Pogenberg, V.,Deineko, V.,Wilmanns, M. (登録日: 2012-05-08, 公開日: 2012-12-12, 最終更新日: 2023-12-20)

主引用文献

Pogenberg, V.,Hogmundsdottir, M.,Bergsteinsdottir, K.,Schepsky, A.,Phung, B.,Deineko, V.,Milewski, M.,Steingrimsson, E.,Wilmanns, M.
Restricted Leucine Zipper Dimerization and Specificity of DNA Recognition of the Melanocyte Master Regulator Mitf
Genes Dev., 26:2647-, 2012

PubMed Abstract: Microphthalmia-associated transcription factor (MITF) is a master regulator of melanocyte development and an important oncogene in melanoma. MITF heterodimeric assembly with related basic helix-loop-helix leucine zipper transcription factors is highly restricted, and its binding profile to cognate DNA sequences is distinct. Here, we determined the crystal structure of MITF in its apo conformation and in the presence of two related DNA response elements, the E-box and M-box. In addition, we investigated mouse and human Mitf mutations to dissect the functional significance of structural features. Owing to an unusual three-residue shift in the leucine zipper register, the MITF homodimer shows a marked kink in one of the two zipper helices to allow an out-of-register assembly. Removal of this insertion relieves restricted heterodimerization by MITF and permits assembly with the transcription factor MAX. Binding of MITF to the M-box motif is mediated by an unusual nonpolar interaction by Ile212, a residue that is mutated in mice and humans with Waardenburg syndrome. As several related transcription factors have low affinity for the M-box sequence, our analysis unravels how these proteins discriminate between similar target sequences. Our data provide a rational basis for targeting MITF in the treatment of important hereditary diseases and cancer.

PubMed: 23207919
DOI: 10.1101/GAD.198192.112

実験手法

X-RAY DIFFRACTION (2.6 Å)