Gross, R. ; Eichler, R. ; Simon, J. (2005)
Site-directed modifications indicate differences in axial haem c iron ligation between the related NrfH and NapC families of multihaem c-type cytochromes.
In: The Biochemical journal, 390 (Pt 3)
Article, Bibliographie
Abstract
During the last decade, a number of related bacterial membrane-bound multihaem c-type cytochromes, collectively referred to as the NapC/NirT family, were identified. These proteins are generally thought to catalyse electron transport between the quinone/quinol pool and periplasmic oxidoreductases. The best-characterized members, the tetrahaem c-type cytochromes NrfH and NapC, mediate electron transport to NrfA and NapA respectively. Amino acid sequence alignments suggest that the nature and position of distal haem c iron ligands differs in NrfH and NapC proteins. Site-directed modification of potential haem c iron-ligating histidine, lysine and methionine residues in Wolinella succinogenes NrfH was performed to determine the implication in electron transport from formate to nitrite. Two histidine, one lysine and one methionine residues were found to be essential, whereas the replacement of three other conserved histidine residues, one methionine and two lysines did not prevent growth by nitrite respiration. The results contrast those previously obtained for Paracoccus pantotrophus NapC, in which four essential histidine residues have been identified that are highly likely to serve as distal haem c iron ligands. The combined experimental evidence suggests different haem ligation patterns within NapC and NrfH proteins, which might reflect their different functions in the bacterial electron transfer.
| Item Type: | Article |
|---|---|
| Erschienen: | 2005 |
| Creators: | Gross, R. ; Eichler, R. ; Simon, J. |
| Type of entry: | Bibliographie |
| Title: | Site-directed modifications indicate differences in axial haem c iron ligation between the related NrfH and NapC families of multihaem c-type cytochromes. |
| Language: | English |
| Date: | 2005 |
| Journal or Publication Title: | The Biochemical journal |
| Volume of the journal: | 390 |
| Issue Number: | Pt 3 |
| Abstract: | During the last decade, a number of related bacterial membrane-bound multihaem c-type cytochromes, collectively referred to as the NapC/NirT family, were identified. These proteins are generally thought to catalyse electron transport between the quinone/quinol pool and periplasmic oxidoreductases. The best-characterized members, the tetrahaem c-type cytochromes NrfH and NapC, mediate electron transport to NrfA and NapA respectively. Amino acid sequence alignments suggest that the nature and position of distal haem c iron ligands differs in NrfH and NapC proteins. Site-directed modification of potential haem c iron-ligating histidine, lysine and methionine residues in Wolinella succinogenes NrfH was performed to determine the implication in electron transport from formate to nitrite. Two histidine, one lysine and one methionine residues were found to be essential, whereas the replacement of three other conserved histidine residues, one methionine and two lysines did not prevent growth by nitrite respiration. The results contrast those previously obtained for Paracoccus pantotrophus NapC, in which four essential histidine residues have been identified that are highly likely to serve as distal haem c iron ligands. The combined experimental evidence suggests different haem ligation patterns within NapC and NrfH proteins, which might reflect their different functions in the bacterial electron transfer. |
| Divisions: | 10 Department of Biology > Microbial Energy Conversion and Biotechnology ?? fb10_mikrobiologie ?? 10 Department of Biology |
| Date Deposited: | 07 Dec 2010 15:12 |
| Last Modified: | 05 Mar 2013 09:42 |
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