Transcriptional regulation and structural modelling of the Synechocystis sp PCC 6803 carboxyl-terminal endoprotease family

: Jansen T, Kidron H, Soitamo A, Salminen T, Maenpaa P

Publisher: ELSEVIER SCIENCE BV

: 2003

FEMS Microbiology Letters

FEMS MICROBIOLOGY LETTERS

: FEMS MICROBIOL LETT

: 228

: 1

: 121

: 128

: 8

: 0378-1097

DOI: https://doi.org/10.1016/S0378-1097(03)00744-4

The Synechocystis sp. PCC 6803 ctp gene family members ctpA (slr0008), ctpB (slr0257) and ctpC (slr 1751), encoding carboxyl-terminal endoproteases (Ctps), were studied at levels of gene transcription and protein structure. Northern blot analysis revealed differential activation and accumulation of the ctp transcripts upon induction of various environmental conditions, including light, temperature, salinity and growth mode, supporting the view of distinct roles of Ctps in Synechocystis sp. PCC 6803 cellular processes. Amino acid sequence comparison of 16 ctp gene products showed that they fall into three distinct groups: the eukaryotic CtpA-like proteins, the prokaryotic CtpA-like proteins and the prokaryotic CtpB/C-like proteins. Structural models of the Synechocystis sp. PCC 6803 Ctps, constructed based on the amino acid sequence alignment and the crystal structure of the Scenedesmus obliquus D1 processing protease, revealed that although the overall structure of the Synechocystis sp. PCC 6803 Ctps is very similar, differences exist in the putative membrane contact regions and in the active site environment. (C) 2003 Published by Elsevier B.V. on behalf of the Federation of European Microbiological Societies.