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Journal of Bacteriology, March 2000, p. 1764-1767, Vol. 182, No. 6
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Nitrate Assimilation Genes of the Marine Diazotrophic, Filamentous Cyanobacterium Trichodesmium sp. Strain WH9601

Qingfeng Wang, Hong Li, and Anton F. Post*

"H. Steinitz" Marine Biology Laboratory, Hebrew University, Coral Beach, 88103 Eilat, Israel

Received 27 October 1999/Accepted 10 December 1999

A 4.0-kb DNA fragment of Trichodesmium sp. strain WH9601 contained gene sequences encoding the nitrate reduction enzymes, nirA and narB. A third gene positioned between nirA and narB encodes a putative membrane protein with similarity to the nitrate permeases of Bacillus subtilis (NasA) and Emericella nidulans (CrnA). The gene was shown to functionally complement a Delta nasA mutant of B. subtilis and was assigned the name napA (nitrate permease). NapA was involved in both nitrate and nitrite uptake by the complemented B. subtilis cells. napA is distinct from the nrt genes that encode the nitrate transporter of freshwater cyanobacteria.

* Corresponding author. Mailing address: "H. Steinitz" Marine Biology Laboratory, Hebrew University, Coral Beach, POB 469, 88103 Eilat, Israel. Phone: 972-7-6360122. Fax: 972-7-6374329. E-mail: anton{at}vms.huji.ac.il.

Journal of Bacteriology, March 2000, p. 1764-1767, Vol. 182, No. 6
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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