7XTE

Crystal Structure of PL-5 family polysaccharide lyase PanPL-N171L mutant from Pandoraea apista in apo form at pH3.5

7XTE の概要

• エントリーDOI: 10.2210/pdb7xte/pdb
• 分子名称: Poly(Beta-D-mannuronate) lyase (2 entities in total)
• 機能のキーワード: pl-5 polysaccharide lyase panpl-n171l apo form, lyase, pandoraea apista
• 由来する生物種: Pandoraea apista
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 40651.90

構造登録者

Dash, P.,Acharya, R. (登録日: 2022-05-17, 公開日: 2022-08-10, 最終更新日: 2024-10-16)

主引用文献

Dash, P.,Acharya, R.
Distinct Modes of Hidden Structural Dynamics in the Functioning of an Allosteric Polysaccharide Lyase.
Acs Cent.Sci., 8:933-947, 2022

PubMed Abstract: Dynamics is an essential process to drive an enzyme to perform a function. When a protein sequence encodes for its three-dimensional structure and hence its function, it essentially defines the intrinsic dynamics of the molecule. The static X-ray crystal structure was thought to shed little insight into the molecule's dynamics until the recently available tool "Ensemble refinement" (ER). Here, we report the structure-function-dynamics of PanPL, an alginate-specific, endolytic, allosteric polysaccharide lyase belonging to the PL-5 family from . The crystal structures determined in apo and tetra-ManA bound forms reveal that the PanPL maintains a closed state with an N-terminal loop lid (N-loop-lid) arched over the active site. The B-factor analyses and ER congruently reveal how pH influences the functionally relevant atomic fluctuations at the N-loop-lid. The ER unveils enhanced fluctuations at the N-loop-lid upon substrate binding. The normal-mode analysis finds that the functional states are confined. The 1 μs simulation study suggests the existence of a hidden open state. The longer N-loop-lid selects a mechanism to adopt a closed state and undergo fluctuations to facilitate the substrate binding. Here, our work demonstrates the distinct modes of dynamics; both intrinsic and substrate-induced conformational changes are vital for enzyme functioning and allostery.

PubMed: 35912344
DOI: 10.1021/acscentsci.2c00277

実験手法

X-RAY DIFFRACTION (2.3 Å)