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Characterization of the pyrophosphate-dependent 6-phosphofructokinase from Methylococcus capsulatus Bath
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Reshetnikov, Alexander S., Rozova, Olga N., Khmelenina, Valentina N., Mustakhimov, Ildar I., Beschastny, Alexander P., Murrell, J. C. (J. Colin) and Trotsenko, Yuri A.. (2008) Characterization of the pyrophosphate-dependent 6-phosphofructokinase from Methylococcus capsulatus Bath. FEMS Microbiology Letters, Vol.288 (No.2). pp. 202-210. ISSN 0378-1097
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Official URL: http://dx.doi.org/10.1111/j.1574-6968.2008.01366.x
Abstract
An active pyrophosphate-dependent 6-phosphofructokinase (PPi-PFK) from the thermotolerant methanotroph Methylococcus capsulatus Bath, containing a six-residue polyhistidine tag, was characterized. The enzyme was homodimeric (2 x 45 kDa), nonallosteric and most active at pH 7.0. PPi-PFK catalyzed reactions of PPi-dependent phosphorylation of fructose-6-phosphate (F-6-P) (K-m 2.27 mM and V-max 7.6 U mg(-1) of protein), sedoheptulose-7-phosphate (K-m 0.027 mM and V-max 31 U mg(-1)) and ribulose-5-phosphate. In the reaction with F-6-P, the apparent K-m for PPi was 0.027 mM, while in the reverse reaction, K-m for orthophosphate was 8.69 mM and that for fructose-1,6-bisphosphate 0.328 mM (V-max 9.0 U mg(-1)). Phylogenetically, M. capsulatus PPi-PFK was most similar to PPi-PFKs from the lithoautotrophic ammonia oxidizers Nitrosomonas europaea (74.0%), Nitrosospira multiformis (73.6%) and Betaproteobacterial methylotroph Methylibium petroleiphilum PM1 (71.6% identity). Genes coding PPi-PFK and a putative V-type H+-translocating pyrophosphatase (H+-PPi-ase) were cotranscribed as an operon. The potential significance of the PPi-PFK for regulation of carbon and energy fluxes in M. capsulatus Bath is discussed.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QR Microbiology |
| Divisions: | Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010) |
| Journal or Publication Title: | FEMS Microbiology Letters |
| Publisher: | Wiley-Blackwell Publishing Ltd. |
| ISSN: | 0378-1097 |
| Date: | November 2008 |
| Volume: | Vol.288 |
| Number: | No.2 |
| Number of Pages: | 9 |
| Page Range: | pp. 202-210 |
| Identification Number: | 10.1111/j.1574-6968.2008.01366.x |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | RFBR, RF RNP |
| Grant number: | 08-04-01484a, 2.1.1.2671 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/29251 |
Data sourced from Thomson Reuters' Web of Knowledge
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