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Hemoglobin in Frankia, a nitrogen-fixing actinomycete
John D Tjepkema1, Robert E Cashon, Jason Beckwith
1Department of Biological Sciences, University of Maine, Orono, Maine 04469-5722, USA. tjepkema@maine.edu
Applied and Environmental Microbiology
|April 27, 2002
Abstract:
Frankia strain CcI3 grown in culture produced a hemoglobin which had optical absorption bands typical of a hemoglobin and a molecular mass of 14.1 kDa. Its equilibrium oxygen binding constant was 274 nM, the oxygen dissociation rate constant was 56 s(-1), and the oxygen association rate constant was 206 microM(-1) s(-1).