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Applied and Environmental Microbiology, June 2004, p. 3443-3448, Vol. 70, No. 6
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.6.3443-3448.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Distribution of RuBisCO Genotypes along a Redox Gradient in Mono Lake, California

Bruno J. Giri, Nasreen Bano, and James T. Hollibaugh*

Department of Marine Sciences, University of Georgia, Athens, Georgia 30602-3636

Received 20 October 2003/ Accepted 20 February 2004

Partial sequences of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) (EC 4.1.1.39) genes were retrieved from samples taken along a redox gradient in alkaline, hypersaline Mono Lake, Calif. The form I gene (cbbL) was found in all samples, whereas form II (cbbM) was not retrieved from any of the samples. None of the RuBisCO sequences we obtained were closely related (nucleotide similarity, <90%) to sequences in the database. Some could be attributed to organisms isolated from the lake (Cyanobium) or appearing in enrichment cultures. Most (52%) of the sequences fell into in one clade, containing sequences that were identical to sequences retrieved from an enrichment culture grown with nitrate and sulfide, and another clade contained sequences identical to those retrieved from an arsenate-reducing, sulfide-oxidizing enrichment.

* Corresponding author. Mailing address: Department of Marine Sciences, University of Georgia, Athens, GA 30602-3636. Phone: (706) 542-5868. Fax: (706) 542-5888. E-mail: aquadoc{at}uga.edu.

Applied and Environmental Microbiology, June 2004, p. 3443-3448, Vol. 70, No. 6
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.6.3443-3448.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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