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Novel bacterial molybdenum and tungsten enzymes: three-dimensional structure, spectroscopy, and reaction mechanism.

Biological chemistry (2005-10-13)
Matthias Boll, Bernhard Schink, Albrecht Messerschmidt, Peter M H Kroneck
ABSTRACT

The molybdenum enzymes 4-hydroxybenzoyl-CoA reductase and pyrogallol-phloroglucinol transhydroxylase and the tungsten enzyme acetylene hydratase catalyze reductive dehydroxylation reactions, i.e., transhydroxylation between phenolic residues and the addition of water to a triple bond. Such activities are unusual for this class of enzymes, which carry either a mononuclear Mo or W center. Crystallization and subsequent structural analysis by high-resolution X-ray crystallography has helped to resolve the reaction centers of these enzymes to a degree that allows us to understand the interaction of the enzyme and the respective substrate(s) in detail, and to develop a concept for the respective reaction mechanism, at least in two cases.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
钨, wire, diam. 0.25 mm, ≥99.9% trace metals basis
Sigma-Aldrich
钨, foil, thickness 0.05 mm, ≥99.9% trace metals basis
Sigma-Aldrich
钨, wire, diam. 0.5 mm, ≥99.9% trace metals basis
Sigma-Aldrich
钨, wire, diam. 1.0 mm, 99.99% trace metals basis
Sigma-Aldrich
钨, foil, thickness 0.25 mm, ≥99.9% trace metals basis
钨, mesh, 50x50mm, nominal aperture 0.2mm, wire diameter 0.05mm, 100 wires/inch, open area 64%, plain weave mesh, 99.95%
Sigma-Aldrich
钨, foil, thickness 0.127 mm, ≥99.9% trace metals basis
钨, wire reel, 5m, diameter 0.005mm, gold plated, 99.95%
Sigma-Aldrich
钨, foil, thickness 0.5 mm, ≥99.9% trace metals basis
钨, wire reel, 25m, diameter 0.05mm, clean, 99.95%
钨, foil, light tested, 100x100mm, thickness 0.05mm, as rolled, 99.95%
钨, lump, 50g, max. size 5mm
钨, wire, straight, 300mm, diameter 0.10mm, 99.9+%
钨, rod, 100mm, diameter 1.6mm, centerless ground, 99.95%
钨, wire reel, 10m, diameter 0.5mm, clean, 99.95%
钨, wire, straight, 1000mm, diameter 0.30mm, 99.9+%
钨, wire, straight, 300mm, diameter 0.25mm, 99.9+%
钨, wire reel, 25m, diameter 0.15mm, clean, 99.95%
钨, wire reel, 25m, diameter 0.1mm, clean, 99.95%
钨, insulated wire, 1m, conductor diameter 0.075mm, insulation thickness 0.02mm, PTFE (polytetrafluoroethylene) insulation, 99.9%
钨, foil, 100x100mm, thickness 0.125mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.15mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.1mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.2mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.3mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 0.5mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 1.0mm, as rolled, 99.95%
钨, foil, 100x100mm, thickness 2.0mm, as rolled, 99.95%
钨, foil, 150x150mm, thickness 0.125mm, as rolled, 99.95%
钨, foil, 150x150mm, thickness 0.15mm, as rolled, 99.95%