Nucleotide sequence of the glgP1 promoter region. A, The coding region of the glgP1 gene is shaded in gray. A bent arrow and boldface letters indicate the identified transcription initiation sites and the −10 and −35 promoter regions, respectively. A NrrA-binding site is enclosed in a box. B, alignment of the regions upstream of glgP1 orthologs from Anabaena PCC 7120 (Ana), Anabaena variabilis ATCC 29413 (Ava), Nostoc punctiforme PCC 73102 (Nos), Anabaena azollae 0708 (Aaz), and Synechocystis PCC 6803 (Syn). The NrrA-binding region within the hetR promoter (14) is shown under the alignment. The conserved sequences are shown by boldface letters.