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. 2012 Jul 16;18(35):10873–10885. doi: 10.1002/chem.201201023

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Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation.

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Suggested "later" steps of chlorophyll breakdown in the peels of ripening Mc-bananas, beginning with "epi-pFCC". Mc-FCC-62 (8²-hydroxy-epi-pFCC), the "secondary" FCC (sFCC) in Mc-bananas, accumulates early during ripening (at rs=5) and is proposed to be the common precursor of all "downstream" catabolites. "Hyper-modified" FCCs (hmFCCs) with a complex propionate ester function, such as Mc-FCC-56 and Mc-FCC-49, accumulate and represent one branch of chlorophyll breakdown. "Modified" FCCs (mFCCs) with a free propionic acid group are elusive and may only exist transiently: they are imported into the vacuole, where they isomerize rapidly to the corresponding NCCs by an acid-catalyzed reaction.[34] Mc-NCCs are the main observed products of the second branch of chlorophyll breakdown, and carry a free propionic acid function (see the main text for details).