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

Tove Jansèn, Heidi Kidron, Arto Soitamo, Tiina Salminen, Pirkko Mäenpää

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)


The Synechocystis sp. PCC 6803 ctp gene family members ctpA (slr0008), ctpB (slr0257) and ctpC (slr1751), 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.

Original languageEnglish
Pages (from-to)121-128
Number of pages8
JournalFEMS Microbiology Letters
Issue number1
Publication statusPublished - 1 Nov 2003
MoE publication typeA1 Journal article-refereed


  • Amino Acid Sequence
  • Bacterial Proteins/chemistry
  • Binding Sites
  • Crystallography
  • Cyanobacteria/enzymology
  • Endopeptidases/chemistry
  • Molecular Sequence Data
  • Protein Structure, Secondary
  • Protein Structure, Tertiary
  • RNA, Messenger/analysis
  • Transcriptional Activation


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