4W4R image
Deposition Date 2014-08-15
Release Date 2015-01-14
Last Version Date 2024-03-20
Entry Detail
PDB ID:
4W4R
Title:
Crystal structure of ent-kaurene synthase BJKS from bradyrhizobium japonicum
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.92 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 41
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Uncharacterized protein blr2150
Gene (Uniprot):blr2150
Chain IDs:A, B
Chain Length:300
Number of Molecules:2
Biological Source:Bradyrhizobium diazoefficiens USDA 110
Primary Citation
Structure, function and inhibition of ent-kaurene synthase from Bradyrhizobium japonicum.
Sci Rep 4 6214 6214 (2014)
PMID: 25269599 DOI: 10.1038/srep06214

Abstact

We report the first X-ray crystal structure of ent-kaur-16-ene synthase from Bradyrhizobium japonicum, together with the results of a site-directed mutagenesis investigation into catalytic activity. The structure is very similar to that of the α domains of modern plant terpene cyclases, a result that is of interest since it has been proposed that many plant terpene cyclases may have arisen from bacterial diterpene cyclases. The ent-copalyl diphosphate substrate binds to a hydrophobic pocket near a cluster of Asp and Arg residues that are essential for catalysis, with the carbocations formed on ionization being protected by Leu, Tyr and Phe residues. A bisphosphonate inhibitor binds to the same site. In the kaurene synthase from the moss Physcomitrella patens, 16-α-hydroxy-ent-kaurane as well as kaurene are produced since Leu and Tyr in the P. patens kaurene synthase active site are replaced by smaller residues enabling carbocation quenching by water. Overall, the results represent the first structure determination of a bacterial diterpene cyclase, providing insights into catalytic activity, as well as structural comparisons with diverse terpene synthases and cyclases which clearly separate the terpene cyclases from other terpene synthases having highly α-helical structures.

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