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Applied and Environmental Microbiology, May 2002, p. 2629-2631, Vol. 68, No. 5
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.5.2629-2631.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Hemoglobin in Frankia, a Nitrogen-Fixing Actinomycete{dagger}

John D. Tjepkema,1* Robert E. Cashon,2 Jason Beckwith,1 and Christa R. Schwintzer1

Department of Biological Sciences, University of Maine, Orono, Maine 04469-5722,1 Department of Biochemistry, Microbiology, and Molecular Biology, University of Maine, Orono, Maine 04469-57352

Received 26 October 2001/ Accepted 28 February 2002

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 µM-1 s-1.

* Corresponding author. Mailing address: Department of Biological Sciences, 5722 Deering Hall, Orono, ME 04469-5722. Phone: (207) 581-2993. Fax: (207) 581-2969. E-mail: tjepkema{at}maine.edu.

{dagger} Maine Agricultural and Forest Experiment Station external publication number 2508.

Applied and Environmental Microbiology, May 2002, p. 2629-2631, Vol. 68, No. 5
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.5.2629-2631.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.





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Copyright © 2002 by the American Society for Microbiology. All rights reserved.