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Isolation and Detection of the Chlorophyll Catabolite Hydroxylating Activity from Capsicum annuum Chromoplasts.

Hydroxylation of chlorophyll catabolites at the so-called C32 position ( Hauenstein et al., 2016 ) is commonly found in all plant species analyzed to date. Here we describe an in vitro hydroxylation assay using Capsicum annuum chromoplast membranes as a source of the hydroxylating activity, which converts the substrate epi-pFCC (epi-primary Fluorescent Chlorophyll Catabolite) ( Mühlecker et al., 2000 ) to epi-pFCC-OH.