Fig. 4.
Possible sources of NADPH in the plastid of Nitzschia Nitz4. The ‘reverse’ triose phosphate/3‐phosphoglycerate shuttle would exchange cytoplasmic NADH for NADPH (Moog et al., 2020), and NAD(P) transhydrogenase (NTH) would use the proton gradient generated by adenosine triphosphate (ATP) hydrolysis, via ATP synthase (Kamikawa et al., 2015), to catalyze interconversion of NADH to NADPH. Chemical substrates and products are shown in blue, protons in orange, and cofactors are shown in green. Arrows show predicted reactions or direction of transport of protons or chemical substrates across membranes. In addition to ATP synthase and NTH, other enzymes encoded by genes present in Nitzschia Nitz4 are shown in dark yellow.