Transcriptional regulation and structural modeling of the FutC subunit of an ABC-type iron transporter in Synechocystis sp. strain PCC 6803.
The futC gene encodes a subunit of an ATP-binding cassette (ABC)-type iron transporter in Synechocystis sp. strain PCC 6803. In the present study, we have focused on the environmental regulation of futC transcription in the model organism Synechocystis sp. strain PCC 6803 and, moreover, studied the transcriptional regulation of the other transporter subunits, futA1, futA2 and futB. The steady-state amounts of the futA1, futA2, futB and futC transcripts were regulated under several conditions studied including darkness, temperature, alternative nitrogen source, salt and osmotic stresses and iron deficiency. Transcription of all subunits of the FutABC-iron transporter seems to be under similar regulation, which, according to our results, may also apply to genes encoding subunits of other transporters in Synechocystis. The sequence alignment, including sequences from six different organisms, revealed the conserved nature of FutC. Based on the sequence alignment and the structural model of FutC, the monomer consists of a nucleotide-binding domain (NBD) and a regulatory domain. The NBD is well conserved indicating completely functional ATP binding.
Brandt
Anna-Maria
AM
Department of Biochemistry and Pharmacy, Abo Akademi University, 20520 Turku, Finland.
Raksajit
Wuttinun
W
Mulo
Paula
P
Incharoensakdi
Aran
A
Salminen
Tiina A
TA
Mäenpää
Pirkko
P
D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001665:Binding Sites; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D007501:Iron / Q000378:metabolism*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009584:Nitrogen / Q000378:metabolism; D017434:Protein Structure, Tertiary; D012329:RNA, Bacterial / Q000235:genetics; D016415:Sequence Alignment; D046939:Synechocystis / Q000235:genetics* / Q000378:metabolism; D014158:Transcription, Genetic
D018528:ATP-Binding Cassette Transporters; D001426:Bacterial Proteins; D012329:RNA, Bacterial; D007501:Iron; D009584:Nitrogen