Photorespiration - Damage Repair Pathway of the Calvin-Benson Cycle

Photorespiration in the context of Rubisco biochemistry, CO2 diffusion and metabolism

“…In the case of the photorespiratory pathway operating as a full cycle, three out of four 2‐PG carbon atoms will be returned to the CBB cycle and one will be released as CO 2 . A detailed description of the enzymatic steps involved in the photorespiratory pathway outlined above can be found in Bauwe ().…”

Knockdown of glycine decarboxylase complex alters photorespiratory carbon isotope fractionation in Oryza sativa leaves

“…By scavenging 2-PG, photorespiration removes a strong inhibitor of enzymes in photosynthetic carbon metabolism (Anderson, 1971; Kelly and Latzko, 1976; Peterhansel et al , 2013 b ; Walker et al , 2016) and recovers up to one molecule of 3-PGA for every two molecules of 2-PG. Nevertheless, a minimum of one out of four 2-PG carbon atoms is released as CO 2 by the glycine decarboxylase complex (GDC) and can be lost by the plant (Bauwe, 2018).…”

“…The GDC is an atypical mitochondrial four-protein system, comprised of three enzymes (P - , T -, and L - protein) and the H-protein, which is a small lipoylated protein (Somerville and Ogren, 1982; Douce et al , 2001; Bauwe, 2018). GDC plays a critical role in the photorespiratory cycle by catalyzing the conversion of two molecules of glycine into serine and one molecule of CO 2 and NH 3 (Somerville, 2001; Maurino and Peterhansel, 2010).…”

Secretome Analysis of Arabidopsis–Trichoderma atroviride Interaction Unveils New Roles for the Plant Glutamate:Glyoxylate Aminotransferase GGAT1 in Plant Growth Induced by the Fungus and Resistance against Botrytis cinerea

“…In the photorespiratory pathway, the key CO 2 fixation enzyme ribulose bisphosphate carboxylase (RuBisCo) synthesizes the metabolite 2-phosphoglycolate (2-PG). Accumulation of higher levels of 2-PG in the cell causes several negative effects in the plant, such as the inhibition of the Calvin cycle enzyme triosephosphate isomerase [75]. The degradation of 2-PG requires the combined action of several enzymes of the photorespiratory pathway, including 2-phosphoglycolate phosphatases (PGLPs), glycolate oxidases (GOXs), and glutamate:glyoxylate aminotransferases (GGATs) [75].…”

“…Accumulation of higher levels of 2-PG in the cell causes several negative effects in the plant, such as the inhibition of the Calvin cycle enzyme triosephosphate isomerase [75]. The degradation of 2-PG requires the combined action of several enzymes of the photorespiratory pathway, including 2-phosphoglycolate phosphatases (PGLPs), glycolate oxidases (GOXs), and glutamate:glyoxylate aminotransferases (GGATs) [75]. Interestingly, we identified two enzymes related with the degradation of 2-PG, PGP1B, which dephosphorylates 2-PG to produce glycolate [76], and GGAT1, that catalyzes the conversion of glyoxylate to glycine during the photorespiration [77].…”