Abstract
The properties of the purified recombinant PPi-dependent 6-phosphofructokinases (PPi-PFKs) from the methanotroph Methylosinus trichosporium OB3b and rhizospheric phytosymbiont Methylobacterium nodulans ORS 2060 were determined. The dependence of activities of PPi-PFK-His6-tag from Ms. trichosporium OB3b (6 × 45 kDa) and PPi-PFK from Mb. nodulans ORS 2060 (4 × 43 kDa) on the concentrations of substrates of forward and reverse reactions conformed to Michaelis-Menten kinetics. Besides fructose-6-phosphate, the enzymes also phosphorylated sedoheptulose-7-phosphate. ADP or AMP (1 mM each) inhibited activity of the Ms. trichosporium PPi-PFK but did not affect the activity of the Mb. nodulans enzyme. Preference of PPi-PFKs to fructose-1,6-bisphosphate implied a predominant function of the enzymes in hexose phosphate synthesis in these bacteria. PPi-PFKs from the methylotrophs have low similarity of translated amino acid sequences (17% identity) and belong to different phylogenetic subgroups of type II 6-phosphofructokinases. The relationship of PPi-PFKs with microaerophilic character of Ms. trichosporium OB3b and adaptation of Mb. nodulans ORS 2060 to anaerobic phase of phytosymbiosis are discussed.
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Abbreviations
- ATP-PFK:
-
ATP-dependent 6-phosphofructokinase
- FBP:
-
fructose-1,6-bisphosphate
- F6P:
-
fructose-6-phosphate
- IPTG:
-
isopropyl β-D-thiogalactopyranoside
- LB:
-
Luria-Bertani medium
- PFK:
-
6-phosphofructokinase
- PPi-PFK:
-
pyrophosphate-dependent 6-phosphofructokinase
- PRK:
-
phosphoribulokinase
- RuBisCO:
-
ribulose-1,5-bisphosphatecarboxylase/oxygenase
- RuMP:
-
ribulose monophosphate
- SBPase:
-
sedoheptulose-1,7-bisphosphatase
- S7P:
-
sedoheptulose-7-phosphate
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Published in Russian in Biokhimiya, 2012, Vol. 77, No. 3, pp. 363–371.
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Rozova, O.N., Khmelenina, V.N. & Trotsenko, Y.A. Characterization of recombinant PPi-dependent 6-phosphofructokinases from Methylosinus trichosporium OB3b and Methylobacterium nodulans ORS 2060. Biochemistry Moscow 77, 288–295 (2012). https://doi.org/10.1134/S0006297912030078
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DOI: https://doi.org/10.1134/S0006297912030078