5HVC

Solution structure of the apo state of the acyl carrier protein from the MLSA2 subunit of the mycolactone polyketide synthase

5HVC の概要

• エントリーDOI: 10.2210/pdb5hvc/pdb
• 関連するPDBエントリー: 5HV8
• NMR情報: BMRB: 30007
• 分子名称: Type I modular polyketide synthase (1 entity in total)
• 機能のキーワード: acyl carrier protein mycolactone, transferase
• 由来する生物種: Mycobacterium ulcerans
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 10237.47

構造登録者

Vance, S.,Tkachenko, O.,Thomas, B.,Bassuni, M.,Hong, H.,Nietlispach, D.,Broadhurst, R.W. (登録日: 2016-01-28, 公開日: 2016-03-09, 最終更新日: 2024-06-19)

主引用文献

Vance, S.,Tkachenko, O.,Thomas, B.,Bassuni, M.,Hong, H.,Nietlispach, D.,Broadhurst, W.
Sticky swinging arm dynamics: studies of an acyl carrier protein domain from the mycolactone polyketide synthase.
Biochem.J., 473:1097-1110, 2016

PubMed Abstract: Type I modular polyketide synthases (PKSs) produce polyketide natural products by passing a growing acyl substrate chain between a series of enzyme domains housed within a gigantic multifunctional polypeptide assembly. Throughout each round of chain extension and modification reactions, the substrate stays covalently linked to an acyl carrier protein (ACP) domain. In the present study we report on the solution structure and dynamics of an ACP domain excised from MLSA2, module 9 of the PKS system that constructs the macrolactone ring of the toxin mycolactone, cause of the tropical disease Buruli ulcer. After modification of apo ACP with 4'-phosphopantetheine (Ppant) to create the holo form, (15)N nuclear spin relaxation and paramagnetic relaxation enhancement (PRE) experiments suggest that the prosthetic group swings freely. The minimal chemical shift perturbations displayed by Ppant-attached C3 and C4 acyl chains imply that these substrate-mimics remain exposed to solvent at the end of a flexible Ppant arm. By contrast, hexanoyl and octanoyl chains yield much larger chemical shift perturbations, indicating that they interact with the surface of the domain. The solution structure of octanoyl-ACP shows the Ppant arm bending to allow the acyl chain to nestle into a nonpolar pocket, whereas the prosthetic group itself remains largely solvent exposed. Although the highly reduced octanoyl group is not a natural substrate for the ACP from MLSA2, similar presentation modes would permit partner enzyme domains to recognize an acyl group while it is bound to the surface of its carrier protein, allowing simultaneous interactions with both the substrate and the ACP.

PubMed: 26920023
DOI: 10.1042/BCJ20160041

実験手法

SOLUTION NMR