3SBE

Crystal structure of RAC1 P29S mutant

3SBE の概要

• エントリーDOI: 10.2210/pdb3sbe/pdb
• 関連するPDBエントリー: 3SBD 3TH5 4GZL 4GZM
• 分子名称: Ras-related C3 botulinum toxin substrate 1, PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER, MAGNESIUM ION, ... (4 entities in total)
• 機能のキーワード: rossmann fold, gtpase, gtp binding, hydrolase
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cell membrane; Lipid-anchor; Cytoplasmic side (By similarity): P63000
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 21381.41

構造登録者

Ha, B.H.,Boggon, T.J. (登録日: 2011-06-03, 公開日: 2012-07-18, 最終更新日: 2024-02-28)

主引用文献

Krauthammer, M.,Kong, Y.,Ha, B.H.,Evans, P.,Bacchiocchi, A.,McCusker, J.P.,Cheng, E.,Davis, M.J.,Goh, G.,Choi, M.,Ariyan, S.,Narayan, D.,Dutton-Regester, K.,Capatana, A.,Holman, E.C.,Bosenberg, M.,Sznol, M.,Kluger, H.M.,Brash, D.E.,Stern, D.F.,Materin, M.A.,Lo, R.S.,Mane, S.,Ma, S.,Kidd, K.K.,Hayward, N.K.,Lifton, R.P.,Schlessinger, J.,Boggon, T.J.,Halaban, R.
Exome sequencing identifies recurrent somatic RAC1 mutations in melanoma.
Nat.Genet., 44:1006-1014, 2012

PubMed Abstract: We characterized the mutational landscape of melanoma, the form of skin cancer with the highest mortality rate, by sequencing the exomes of 147 melanomas. Sun-exposed melanomas had markedly more ultraviolet (UV)-like C>T somatic mutations compared to sun-shielded acral, mucosal and uveal melanomas. Among the newly identified cancer genes was PPP6C, encoding a serine/threonine phosphatase, which harbored mutations that clustered in the active site in 12% of sun-exposed melanomas, exclusively in tumors with mutations in BRAF or NRAS. Notably, we identified a recurrent UV-signature, an activating mutation in RAC1 in 9.2% of sun-exposed melanomas. This activating mutation, the third most frequent in our cohort of sun-exposed melanoma after those of BRAF and NRAS, changes Pro29 to serine (RAC1(P29S)) in the highly conserved switch I domain. Crystal structures, and biochemical and functional studies of RAC1(P29S) showed that the alteration releases the conformational restraint conferred by the conserved proline, causes an increased binding of the protein to downstream effectors, and promotes melanocyte proliferation and migration. These findings raise the possibility that pharmacological inhibition of downstream effectors of RAC1 signaling could be of therapeutic benefit.

PubMed: 22842228
DOI: 10.1038/ng.2359

実験手法

X-RAY DIFFRACTION (2.6 Å)