What is it about?
A metabolic pathway is described that impacts the aroma of apple fruit. It uses two simple products of primary metabolism and shunts them into a pathway, previously only found in bacteria, that leads to the formation of numerous aroma-active esters
Photo by Aarón Blanco Tejedor on Unsplash
Why is it important?
Scent is one of the primary means for organisms, including humans, to locate food and evaluate its edibility. In fruits, esters are often the predominant class of odor-active compounds. However, our understanding as to how plants make esters is rudimentary. In ripening apple, the supposition has been that the precursors to esters come from degradative reactions. This work demonstrates quite the opposite. A pathway is turned on during apple ripening that takes two of the most fundamental metabolites in plants, pyruvate and acetyl-CoA, and generates esters that impact aroma. Interestingly, the pathway has no feedback regulation, leading to aroma production that persists even as fruits ripen and senesce.
Read the Original
This page is a summary of: Citramalate synthase yields a biosynthetic pathway for isoleucine and straight- and branched-chain ester formation in ripening apple fruit, Proceedings of the National Academy of Sciences, January 2021, Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.2009988118.
You can read the full text:
The following have contributed to this page