Enzyme-catalysed nitrate reduction-themes and variations as revealed by protein film voltammetry.
Protein film voltammetry has been used to define the catalytic performance of two nitrate reductases: the respiratory nitrate reductase, NarGH, from Paracoccus pantotrophus and the assimilatory nitrate reductase, NarB, from Synechococcus sp. PCC 7942. NarGH and NarB present distinct "fingerprints" of catalytic activity when viewed in this way. Potentials that provide insufficient driving force for significant rates of nitrate reduction by NarB result in appreciable rates of nitrate reduction by NarGH. However, both enzymes display complex modulations in their rate of substrate reduction when viewed across the electrochemical potential domain.
Butt
Julea N
JN
Centre for Metalloprotein Spectroscopy and Biology, School of Chemical Sciences, University of East Anglia, Norwich NR4 7TJ, UK. j.butt@uea.ac.uk
Anderson
Lee J
LJ
Rubio
Luis M
LM
Richardson
David J
DJ
Flores
Enrique
E
Herrero
Antonia
A
D002384:Catalysis; D004563:Electrochemistry; D004798:Enzymes / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D010084:Oxidation-Reduction; D011506:Proteins / Q000737:chemistry*
D004798:Enzymes; D009566:Nitrates; D011506:Proteins