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Figure 6 | BMC Plant Biology

Figure 6

From: Characterization of bacterial-type phosphoenolpyruvate carboxylase expressed in male gametophyte of higher plants

Figure 6

Schematic model of the hypothetical role of BTPC in lily and Arabidopsis pollen development. Before PMI in the lily microspore or before PMII in Arabidopsis pollen, PEPC occurs as a Class-1 heterotetrameric PEPC complex comprising PTPC (green circles) and Ub-PTPC (green circles with a smaller orange circle). Ub-PTPC:PTPC is allosterically inhibited by L-malate and aspartic acid metabolized from oxaloacetate. When BTPC (red circles) is expressed, PEPC becomes the Class-2 heterooctameric PEPC complex comprising BTPC:Ub-PTPC:PTPC and its sensitivity to inhibitors is reduced, whereas its sensitivity to activators is maintained. Accordingly, the metabolic flow from oxaloacetate to protein and lipid synthesis is enhanced during the process of pollen maturation.

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