Fructose 2,6-Bisphosphate as a Regulatory Metabolite in Plants

OCCURRENCE IN PLANT TISSUES....... . . . . ....... ...... . . . . . . . . . .... . . . ... . . .... . . . . . . . .... 234 ENZYMES REGULATED BY F26BP ...... . . . . ..... . . ..... . . . . . . . . . . ... . . . . . . . . ...... . . . ... ..... 235 REGULATION OF F26BP CONCENTRATION . . . . . . . ....... . . . . . . ...... . . . ... . .... 237 Metabolic Control of F6P, 2KIF26BPase ... .. .. . . . . . . . . ..... . . . . . . . ...... . . . ...... . . . . . . . . . . 237 Possible Coarse Control... . . .. .. . . . . . . .... . . . . . .. ... . . . . . . . . ..... . . . .. . . . ..... . . . . . ..... . . . . . . . . 238 ROLE IN GLyCOLySIS..... . . . . . . ....... . . . . . . . . .. . . . . . . . .. . . . . . . . . 238 Metabolite-Mediated Interconversion of Enzymes . . . . . . .. . ... . . . . . . ... ... . . . . 239 Molecular Forms of PFP . . .... . . . . . . . . . . ...... . . . . . . . . . ..... . . . . . . . .... . . . . . . . .... . . . ... . . . ..... 239 ROLE IN GLUCONEOGENESIS.. . . . . . . ...... . . . . . ... . . . ..... . . . . . . ....... . . . . . ..... . . . . ......... 240 Effects on FBPase .. . . . . .. . . . ...... . . . . . . . 240 Photosynthetic Tissues 241 Compartmentation in C4 Plants ........ _ _ _ _ . ..... . . .. ... ..... ...... . ..... . . . . . . . .. 242 Nonphotosynthetic Tissues 243 SUMMARy.... . . ... . . . . . . . . . . . . ... . . . . . . . . . . . ..... . . . . . . . . . . . . . . . . . . . . . . . . . . .... . . . . . . . . . ... . . . . . . . . . . 243