PDBsum entry 5zyc

Isomerase

PDB id: 5zyc

Contents

Protein chain

384 a.a.

Ligands

ACT

EDO

Metals

_MN ×2

Waters ×341

References listed in PDB file

Key reference

• Title: Structural analysis of substrate recognition by glucose isomerase in mn²⁺ binding mode at m2 site in s.&Nbsp;rubiginosus.
• Authors: J.E.Bae, K.Y.Hwang, K.H.Nam.
• Ref.: Biochem Biophys Res Commun, 2018, 503, 770-775. [DOI no: 10.1016/j.bbrc.2018.06.074]
• PubMed id: 29909012

Abstract

Glucose isomerase (GI) catalyzes the reversible enzymatic isomerization of d-glucose and d-xylose to d-fructose and d-xylulose, respectively. This is one of the most important enzymes in the production of high-fructose corn syrup (HFCS) and biofuel. We recently determined the crystal structure of GI from S. rubiginosus (SruGI) complexed with a xylitol inhibitor in one metal binding mode. Although we assessed inhibitor binding at the M1 site, the metal binding at the M2 site and the substrate recognition mechanism for SruGI remains the unclear. Here, we report the crystal structure of the two metal binding modes of SruGI and its complex with glucose. This study provides a snapshot of metal binding at the SruGI M2 site in the presence of Mn²⁺, but not in the presence of Mg²⁺. Metal binding at the M2 site elicits a configuration change at the M1 site. Glucose molecule can only bind to the M1 site in presence of Mn²⁺ at the M2 site. Glucose and Mn²⁺ at the M2 site were bridged by water molecules using a hydrogen bonding network. The metal binding geometry of the M2 site indicates a distorted octahedral coordination with an angle of 55-110°, whereas the M1 site has a relatively stable octahedral coordination with an angle of 85-95°. We suggest a two-step sequential process for SruGI substrate recognition, in Mn²⁺ binding mode, at the M2 site. Our results provide a better understanding of the molecular role of the M2 site in GI substrate recognition.