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 Previous Article

Journal of Bacteriology, October 2008, p. 6534-6539, Vol. 190, No. 19
0021-9193/08/$08.00+0     doi:10.1128/JB.00613-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

The amt Gene Cluster of the Heterocyst-Forming Cyanobacterium Anabaena sp. Strain PCC 7120 {triangledown}

Javier Paz-Yepes, Victoria Merino-Puerto, Antonia Herrero, and Enrique Flores*

Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas, and Universidad de Sevilla, E-41092 Seville, Spain

Received 2 May 2008/ Accepted 30 July 2008

The genome of the heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120 bears a gene cluster including three amt genes that, based on homology of their protein products, we designate amt4, amt1, and amtB. Expression of the three genes took place upon ammonium withdrawal in combined nitrogen-free medium and was NtcA dependent. The genes were transcribed independently, but an amt4-amt1 dicistronic transcript was also produced, and expression was highest for the amt1 gene. A mutant with the whole amt region removed could grow under laboratory conditions using ammonium, nitrate, or dinitrogen as the nitrogen source.

* Corresponding author. Mailing address: Instituto de Bioquímica Vegetal y Fotosíntesis, Centro de Investigaciones Científicas Isla de la Cartuja, Américo Vespucio 49, E-41092 Seville, Spain. Phone: 34954489523. Fax: 34954460065. E-mail: eflores{at}ibvf.csic.es

{triangledown} Published ahead of print on 8 August 2008.

Journal of Bacteriology, October 2008, p. 6534-6539, Vol. 190, No. 19
0021-9193/08/$08.00+0     doi:10.1128/JB.00613-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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