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Expression, purification and crystallization of a plant polyketide cyclase from Cannabis sativa
Author(s) -
Yang Xinmei,
Matsui Takashi,
Mori Takahiro,
Taura Futoshi,
Noguchi Hiroshi,
Abe Ikuro,
Morita Hiroyuki
Publication year - 2015
Publication title -
acta crystallographica section f
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 37
ISSN - 2053-230X
DOI - 10.1107/s2053230x15020385
Subject(s) - polyketide , cyclase , escherichia coli , stereochemistry , enzyme , biosynthesis , biology , chemistry , biochemistry , gene
Plant polyketides are a structurally diverse family of natural products. In the biosynthesis of plant polyketides, the construction of the carbocyclic scaffold is a key step in diversifying the polyketide structure. Olivetolic acid cyclase (OAC) from Cannabis sativa L. is the only known plant polyketide cyclase that catalyzes the C2–C7 intramolecular aldol cyclization of linear pentyl tetra‐β‐ketide‐CoA to generate olivetolic acid in the biosynthesis of cannabinoids. The enzyme is also thought to belong to the dimeric α+β barrel (DABB) protein family. However, because of a lack of functional analysis of other plant DABB proteins and low sequence identity with the functionally distinct bacterial DABB proteins, the catalytic mechanism of OAC has remained unclear. To clarify the intimate catalytic mechanism of OAC, the enzyme was overexpressed in Escherichia coli and crystallized using the vapour‐diffusion method. The crystals diffracted X‐rays to 1.40 Å resolution and belonged to space group P 3 1 21 or P 3 2 21, with unit‐cell parameters a = b = 47.3, c = 176.0 Å. Further crystallographic analysis will provide valuable insights into the structure–function relationship and catalytic mechanism of OAC.