Structural Insights into the CotB2-Catalyzed Cyclization of Geranylgeranyl Diphosphate to the Diterpene Cyclooctat-9-en-7-ol.

Abstract:

:The diterpene cyclase CotB2 catalyzes the cyclization of geranylgeranyl diphosphate (GGPP) to the tricyclic cyclooctat-9-en-7-ol, which is characterized by a 5-8-5-fused ring skeleton. We have previously proposed a cyclization cascade involving a unique carbon-carbon bond rearrangement combined with multiple hydride shifts, all occurring at a single active site. Here, we report the first high-resolution X-ray crystal structure of CotB2 with bound substrate analog geranylgeranyl thiodiphosphate (GGSPP). In the GGSPP-bound form, GGSPP folds into a unique S-shaped conformation that probably reflects the substrate-bound state prior to ionization of the substrate GGPP. The folded framework of GGSPP is surrounded by hydrophobic residues and several aromatic and asparagine residues that are well-positioned to stabilize a series of reactive carbocation intermediates through a combination of cation-π and dipole charge interactions. The combined crystal structures and mutagenesis-based biochemical assays provide a structural basis for exquisite control of ring formation and stereochemistry during CotB2 catalysis.

journal_name

ACS Chem Biol

journal_title

ACS chemical biology

authors

Tomita T,Kim SY,Teramoto K,Meguro A,Ozaki T,Yoshida A,Motoyoshi Y,Mori N,Ishigami K,Watanabe H,Nishiyama M,Kuzuyama T

doi

10.1021/acschembio.7b00154

subject

Has Abstract

pub_date

2017-06-16 00:00:00

pages

1621-1628

issue

6

eissn

1554-8929

issn

1554-8937

journal_volume

12

pub_type

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