Using high-throughput 13CO2 labeling to determine if photorespiration can be engineered to increase flux to one-carbon metabolism.

13C labeling shows that formate production from glyoxylate does not significantly contribute to C1 metabolism in Arabidopsis leaves, even with metabolic engineering.

• Why it matters: Understanding the pathways contributing to C1 metabolism is crucial for potential metabolic engineering efforts to enhance plant productivity and stress responses. The role of formate derived from glyoxylate has been hypothesized but remains unconfirmed, creating a knowledge gap in plant metabolic regulation.
• What they did: Researchers developed a high-throughput 13CO2 labeling system and applied it to wild-type, catalase knockout, fdh knockout, and double knockout Arabidopsis thaliana leaves, analyzing C1 metabolite labeling kinetics.
• The result: Findings indicate that fdh knockout plants show no difference from wild-type in C1 labeling, while catalase mutants label C1 metabolites more slowly, implying formate from glyoxylate is not a major or engineerable contributor to C1 metabolism.