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Crystal structure of substrate-bound bifunctional proline racemase/hydroxyproline epimerase from a hyperthermophilic archaeon.
- Source :
-
Biochemical and biophysical research communications [Biochem Biophys Res Commun] 2019 Mar 26; Vol. 511 (1), pp. 135-140. Date of Electronic Publication: 2019 Feb 14. - Publication Year :
- 2019
-
Abstract
- The hypothetical OCC&#95;00372 protein from Thermococcus litoralis is a member of the ProR superfamily from hyperthermophilic archaea and exhibits unique bifunctional proline racemase/hydroxyproline 2-epimerase activity. However, the molecular mechanism of the broad substrate specificity and extreme thermostability of this enzyme (TlProR) remains unclear. Here we determined the crystal structure of TlProR at 2.7 Å resolution. Of note, a substrate proline molecule, derived from expression host Escherichia coli cells, was tightly bound in the active site of TlProR. The substrate bound structure and mutational analyses suggested that Trp241 is involved in hydroxyproline recognition by making a hydrogen bond between the indole group of Trp241 and the hydroxyl group of hydroxyproline. Additionally, Tyr171 may contribute to the thermostability by making hydrogen bonds between the hydroxyl group of Tyr171 and catalytic residues. Our structural and functional analyses provide a structural basis for understanding the molecular mechanism of substrate specificity and thermostability of ProR superfamily proteins.<br /> (Copyright © 2019 Elsevier Inc. All rights reserved.)
- Subjects :
- Amino Acid Isomerases metabolism
Binding Sites
Catalytic Domain
Crystallography, X-Ray
Enzyme Stability
Hydroxyproline metabolism
Models, Molecular
Protein Conformation
Substrate Specificity
Thermococcus chemistry
Thermococcus metabolism
Amino Acid Isomerases chemistry
Thermococcus enzymology
Subjects
Details
- Language :
- English
- ISSN :
- 1090-2104
- Volume :
- 511
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Biochemical and biophysical research communications
- Publication Type :
- Academic Journal
- Accession number :
- 30773259
- Full Text :
- https://doi.org/10.1016/j.bbrc.2019.01.141