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J Bacteriol, March 1998, p. 1596-1599, Vol. 180, No. 6
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Cloning and Sequencing of a Form II Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase from the Bacterial Symbiont of the Hydrothermal Vent Tubeworm Riftia pachyptila

Jonathan J. Robinson,1 Jeffrey L. Stein,2 and Colleen M. Cavanaugh1,*

Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138,1 and Diversa Corp., San Diego, California 921212

Received 4 August 1997/Accepted 13 January 1998

The bacterial symbiont of the hydrothermal vent tubeworm fixes carbon via the Calvin-Benson cycle and has been shown previously to express a form II ribulose-1,5-bisphosphate carboxylase/oxygenase (RubisCO). The gene cbbM, which encodes this enzyme, has been cloned and sequenced. The gene has the highest identity with the cbbM gene from Rhodospirillum rubrum, and analysis of the inferred amino acid sequence reveals that all active-site residues are conserved. This is the first form II RubisCO cloned and sequenced from a chemoautotrophic symbiont and from a deep-sea organism.

* Corresponding author. Mailing address: Department of Organismic and Evolutionary Biology, Harvard University, 16 Divinity Ave., Cambridge, MA 02138. Phone: 617-495-2177. Fax: 617-496-6933. E-mail: cavanaug{at}hump.harvard.edu.




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