4A2S

Structure of the engineered retro-aldolase RA95.5

4A2S の概要

• エントリーDOI: 10.2210/pdb4a2s/pdb
• 関連するPDBエントリー: 1A53 1IGS 1JUK 1JUL 1LBF 1LBL 2C3Z 4A2R
• 分子名称: INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE, 1-(6-METHOXYNAPHTHALEN-2-YL)BUTANE-1,3-DIONE (3 entities in total)
• 機能のキーワード: lyase, engineered enzyme, directed evolution
• 由来する生物種: SULFOLOBUS SOLFATARICUS
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 30233.84

構造登録者

Giger, L.,Caner, S.,Kast, P.,Baker, D.,Ban, N.,Hilvert, D. (登録日: 2011-09-28, 公開日: 2012-11-07, 最終更新日: 2024-11-06)

主引用文献

Giger, L.,Caner, S.,Obexer, R.,Kast, P.,Baker, D.,Ban, N.,Hilvert, D.
Evolution of a designed retro-aldolase leads to complete active site remodeling.
Nat.Chem.Biol., 9:494-498, 2013

PubMed Abstract: Evolutionary advances are often fueled by unanticipated innovation. Directed evolution of a computationally designed enzyme suggests that pronounced molecular changes can also drive the optimization of primitive protein active sites. The specific activity of an artificial retro-aldolase was boosted >4,400-fold by random mutagenesis and screening, affording catalytic efficiencies approaching those of natural enzymes. However, structural and mechanistic studies reveal that the engineered catalytic apparatus, consisting of a reactive lysine and an ordered water molecule, was unexpectedly abandoned in favor of a new lysine residue in a substrate-binding pocket created during the optimization process. Structures of the initial in silico design, a mechanistically promiscuous intermediate and one of the most evolved variants highlight the importance of loop mobility and supporting functional groups in the emergence of the new catalytic center. Such internal competition between alternative reactive sites may have characterized the early evolution of many natural enzymes.

PubMed: 23748672
DOI: 10.1038/nchembio.1276

実験手法

X-RAY DIFFRACTION (1.4 Å)