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Jordan DB, Braker JD. Rate-limiting steps of a stereochemistry retaining β-d-xylosidase from Geobacillus stearothermophilus acting on four substrates. Arch Biochem Biophys 2015; 583:73-8. [DOI: 10.1016/j.abb.2015.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 08/06/2015] [Accepted: 08/07/2015] [Indexed: 10/23/2022]
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Dann R, Lansky S, Lavid N, Zehavi A, Belakhov V, Baasov T, Dvir H, Manjasetty B, Belrhali H, Shoham Y, Shoham G. Preliminary crystallographic analysis of Xyn52B2, a GH52 β-D-xylosidase from Geobacillus stearothermophilus T6. ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY COMMUNICATIONS 2014; 70:1675-82. [PMID: 25484225 DOI: 10.1107/s2053230x14023887] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 10/29/2014] [Indexed: 11/10/2022]
Abstract
Geobacillus stearothermophilus T6 is a thermophilic bacterium that possesses an extensive hemicellulolytic system, including over 40 specific genes that are dedicated to this purpose. For the utilization of xylan, the bacterium uses an extracellular xylanase which degrades xylan to decorated xylo-oligomers that are imported into the cell. These oligomers are hydrolyzed by side-chain-cleaving enzymes such as arabinofuranosidases, acetylesterases and a glucuronidase, and finally by an intracellular xylanase and a number of β-xylosidases. One of these β-xylosidases is Xyn52B2, a GH52 enzyme that has already proved to be useful for various glycosynthesis applications. In addition to its demonstrated glycosynthase properties, interest in the structural aspects of Xyn52B2 stems from its special glycoside hydrolase family, GH52, the structures and mechanisms of which are only starting to be resolved. Here, the cloning, overexpression, purification and crystallization of Xyn52B2 are reported. The most suitable crystal form that has been obtained belonged to the orthorhombic P212121 space group, with average unit-cell parameters a = 97.7, b = 119.1, c = 242.3 Å. Several X-ray diffraction data sets have been collected from flash-cooled crystals of this form, including the wild-type enzyme (3.70 Å resolution), the E335G catalytic mutant (2.95 Å resolution), a potential mercury derivative (2.15 Å resolution) and a selenomethionine derivative (3.90 Å resolution). These data are currently being used for detailed three-dimensional structure determination of the Xyn52B2 protein.
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Affiliation(s)
- Roie Dann
- Institute of Chemistry and the Laboratory for Structural Chemistry and Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Shifra Lansky
- Institute of Chemistry and the Laboratory for Structural Chemistry and Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Noa Lavid
- Department of Biotechnology and Food Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Arie Zehavi
- Department of Biotechnology and Food Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Valery Belakhov
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Timor Baasov
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Hay Dvir
- Technion Center for Structural Biology, Lorry I. Lokey Center for Life Sciences and Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Babu Manjasetty
- European Molecular Biology Laboratory, Grenoble Outstation, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Hassan Belrhali
- European Molecular Biology Laboratory, Grenoble Outstation, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Yuval Shoham
- Department of Biotechnology and Food Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Gil Shoham
- Institute of Chemistry and the Laboratory for Structural Chemistry and Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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