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The structure at 1.6 Angstroms resolution of the protein product of the At4g34215 gene from Arabidopsis thaliana.

TitleThe structure at 1.6 Angstroms resolution of the protein product of the At4g34215 gene from Arabidopsis thaliana.
Publication TypeJournal Article
Year of Publication2005
AuthorsBitto E, Bingman CA, McCoy JG, Allard STM, Wesenberg GE, Phillips GN
JournalActa Crystallogr D Biol Crystallogr
Volume61
IssuePt 12
Pagination1655-61
Date Published2005 Dec
ISSN0907-4449
KeywordsAmino Acid Sequence, Arabidopsis Proteins, Binding Sites, Crystallization, Crystallography, X-Ray, Esterases, Molecular Sequence Data, Protein Folding, Sequence Alignment
Abstract

The crystal structure of the At4g34215 protein of Arabidopsis thaliana was determined by molecular replacement and refined to an R factor of 14.6% (R(free) = 18.3%) at 1.6 Angstroms resolution. The crystal structure confirms that At4g34215 belongs to the SGNH-hydrolase superfamily of enzymes. The catalytic triad of the enzyme comprises residues Ser31, His238 and Asp235. In this structure the catalytic serine residue was found to be covalently modified, possibly by phenylmethylsulfonyl fluoride. The structure also reveals a previously undescribed variation within the active site. The conserved asparagine from block III, which provides a hydrogen bond for an oxyanion hole in the SGNH-hydrolase superfamily enzymes, is missing in At4g34215 and is functionally replaced by Gln30 from block I. This residue is positioned in a catalytically competent conformation by nearby residues, including Gln159, Gly160 and Glu161, which are fully conserved in the carbohydrate esterase family 6 enzymes.

DOI10.1107/S0907444905034074
Alternate JournalActa Crystallogr. D Biol. Crystallogr.
PubMed ID16301800
Grant ListP50 GM64598 / GM / NIGMS NIH HHS / United States
U54 GM074901 / GM / NIGMS NIH HHS / United States
Y1-CO-1020 / CO / NCI NIH HHS / United States
Y1-GM-1104 / GM / NIGMS NIH HHS / United States