Abstract
Pyrophosphate-dependent phosphofructokinase (PFP; EC 2.7.1.90) and two isoforms of ATP-dependent phosphofructokinase (PFK I and PFK II; EC 2.7.1.11) from ripened banana (Musa cavendishii L. cv. Cavendish) fruits were resolved via hydrophobic interaction fast protein liquid chromatography (FPLC), and further purified using anion-exchange and gel filtration FPLC. PFP was purified 1,158-fold to a final specific activity of 13.9 μmol fructose 1,6-bisphosphate produced (mg protein)−1 min−1. Gel filtration FPLC and immunoblot analyses indicated that this PFP exists as a 490-kDa heterooctomer composed of equal amounts of 66- (α) and 60-kDa (β) subunits. PFP displayed hyperbolic saturation kinetics for fructose 6-phosphate (Fru 6-P), PPi, fructose 1,6-bisphosphate, and Pi (K m values = 32, 9.7, 25, and 410 μM, respectively) in the presence of saturating (5 μM) fructose 2,6-bisphosphate, which elicited a 24-fold enhancement of glycolytic PFP activity (K a=8 nM). PFK I and PFK II were each purified about 350-fold to final specific activities of 5.5–6.0 μmol fructose 1,6-bisphosphate produced (mg protein)−1 min−1. Analytical gel filtration yielded respective native molecular masses of 210 and 160 kDa for PFK I and PFK II. Several properties of PFK I and PFK II were consistent with their respective designation as plastid and cytosolic PFK isozymes. PFK I and PFK II exhibited: (i) pH optima of 8.0 and 7.3, respectively; (ii) hyperbolic saturation kinetics for ATP (K m=34 and 21 μM, respectively); and (iii) sigmoidal saturation kinetics for Fru 6-P (S 0.5=540 and 90 μM, respectively). Allosteric effects of phosphoenolpyruvate (PEP) and Pi on the activities of PFP, PFK I, and PFK II were characterized. Increasing concentrations of PEP or Pi progressively disrupted fructose 2,6-bisphosphate binding by PFP. PEP potently inhibited PFK I and to a lesser extent PFK II (I 50=2.3 and 900 μM, respectively), while Pi activated PFK I by reducing its sensitivity to PEP inhibition. Our results are consistent with: (i) the respiratory climacteric being regulated by fine (allosteric) control of pre-existing enzymes; and (ii) primary and secondary glycolytic flux control being exerted at the levels of PEP and Fru 6-P metabolism, respectively.
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Notes
This concentration range was estimated from the data reported by Ball and ap Rees (1988) by assuming that Fru-2,6-P2 is restricted to the cytosol and that the cytosol represents 10% of the cell's volume.
Abbreviations
- FPLC:
-
fast protein liquid chromatography
- Fru 6-P:
-
fructose 6-phosphate
- Fru 1,6-P2 :
-
fructose 1,6-bisphosphate
- Fru 2,6-P2 :
-
fructose 2,6-bisphosphate
- PEP:
-
phosphoenolpyruvate
- PEPCase:
-
phosphoenolpyruvate carboxylase
- PFK and PFP:
-
ATP- and PPi-dependent phosphofructokinase, respectively
- PKc :
-
cytosolic pyruvate kinase
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Financial support was kindly provided by research and equipment grants from the Natural Sciences and Engineering Research Council of Canada (NSERC).
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Turner, W.L., Plaxton, W.C. Purification and characterization of pyrophosphate- and ATP-dependent phosphofructokinases from banana fruit. Planta 217, 113–121 (2003). https://doi.org/10.1007/s00425-002-0962-7
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DOI: https://doi.org/10.1007/s00425-002-0962-7