5mr0

Thermophilic archaeal branched-chain amino acid transaminases from Geoglobus acetivorans and Archaeoglobus fulgidus: biochemical and structural characterisation

spinqualitylabelsall models 5mr0, resolution 1.98Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5mr0 is a 6 chain structure with sequence from Archaeoglobus fulgidus DSM 4304. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.98Å Ligands: CL, EDO, LLP, PEG, PXG, TAM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ILVE_ARCFU Acts on leucine, isoleucine and valine. Publication Abstract from PubMed Two new thermophilic branched chain amino acid transaminases have been identified within the genomes of different hyper-thermophilic archaea, Geoglobus acetivorans, and Archaeoglobus fulgidus. These enzymes belong to the class IV of transaminases as defined by their structural fold. The enzymes have been cloned and over-expressed in Escherichia coli and the recombinant enzymes have been characterized both biochemically and structurally. Both enzymes showed high thermostability with optimal temperature for activity at 80 and 85 degrees C, respectively. They retain good activity after exposure to 50% of the organic solvents, ethanol, methanol, DMSO and acetonitrile. The enzymes show a low activity to (R)-methylbenzylamine but no activity to (S)-methylbenzylamine. Both enzymes have been crystallized and their structures solved in the internal aldimine form, to 1.9 A resolution for the Geoglobus enzyme and 2.0 A for the Archaeoglobus enzyme. Also the Geoglobus enzyme structure has been determined in complex with the amino acceptor alpha-ketoglutarate and the Archaeoglobus enzyme in complex with the inhibitor gabaculine. These two complexes have helped to determine the conformation of the enzymes during enzymatic turnover and have increased understanding of their substrate specificity. A comparison has been made with another (R) selective class IV transaminase from the fungus Nectria haematococca which was previously studied in complex with gabaculine. The subtle structural differences between these enzymes has provided insight regarding their different substrate specificities. Thermostable Branched-Chain Amino Acid Transaminases From the Archaea Geoglobus acetivorans and Archaeoglobus fulgidus: Biochemical and Structural Characterization.,Isupov MN, Boyko KM, Sutter JM, James P, Sayer C, Schmidt M, Schonheit P, Nikolaeva AY, Stekhanova TN, Mardanov AV, Ravin NV, Bezsudnova EY, Popov VO, Littlechild JA Front Bioeng Biotechnol. 2019 Jan 24;7:7. doi: 10.3389/fbioe.2019.00007., eCollection 2019. PMID:30733943 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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