6RTZ

Light-Regulation of Imidazole Glycerol Phosphate Synthase by Interference with its Allosteric Machinery through Photo-Sensitive Unnatural Amino Acids

6RTZ の概要

• エントリーDOI: 10.2210/pdb6rtz/pdb
• 分子名称: Imidazole glycerol phosphate synthase subunit HisF, Imidazole glycerol phosphate synthase subunit HisH, PHOSPHATE ION, ... (4 entities in total)
• 機能のキーワード: unnatural amino acids, phenylalanine-4'-azobenzene (azof), o-nitropiperonyl-o-tyrosine (npy), lyase
• 由来する生物種: Thermotoga maritima; 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 51074.38

構造登録者

Kneuttinger, A.,Rajendran, C.,Sterner, R. (登録日: 2019-05-27, 公開日: 2020-05-20, 最終更新日: 2024-01-24)

主引用文献

Kneuttinger, A.C.,Straub, K.,Bittner, P.,Simeth, N.A.,Bruckmann, A.,Busch, F.,Rajendran, C.,Hupfeld, E.,Wysocki, V.H.,Horinek, D.,Konig, B.,Merkl, R.,Sterner, R.
Light Regulation of Enzyme Allostery through Photo-responsive Unnatural Amino Acids.
Cell Chem Biol, 26:1501-1514.e9, 2019

PubMed Abstract: Imidazole glycerol phosphate synthase (ImGPS) is an allosteric bienzyme complex in which substrate binding to the synthase subunit HisF stimulates the glutaminase subunit HisH. To control this stimulation with light, we have incorporated the photo-responsive unnatural amino acids phenylalanine-4'-azobenzene (AzoF), o-nitropiperonyl-O-tyrosine (NPY), and methyl-o-nitropiperonyllysine (mNPK) at strategic positions of HisF. The light-mediated isomerization of AzoF at position 55 (fS55AzoF ↔ fS55AzoF) resulted in a reversible 10-fold regulation of HisH activity. The light-mediated decaging of NPY at position 39 (fY39NPY → fY39) and of mNPK at position 99 (fK99mNPK → fK99) led to a 4- to 6-fold increase of HisH activity. Molecular dynamics simulations explained how the unnatural amino acids interfere with the allosteric machinery of ImGPS and revealed additional aspects of HisH stimulation in wild-type ImGPS. Our findings show that unnatural amino acids can be used as a powerful tool for the spatiotemporal control of a central metabolic enzyme complex by light.

PubMed: 31495713
DOI: 10.1016/j.chembiol.2019.08.006

実験手法

X-RAY DIFFRACTION (2.87 Å)