Meta-depside bonds

In enzymatic studies with cell-free extracts from higher plants, however, no evidence has been found to date for galloyl-CoA s involvement in the biosynthesis of / -glucogallin, or its higher galloylated derivatives an eventual role in the formation of the chemically different meta-depside bonds of gallotannins has not been investigated. 

Figure 4.14 Proposed biosynthetic pathways of higher substituted gallotannins. Roman numerals represent galloyltransferases with different regioselectivities. Gal gallic acid residue (bold print for newly attached residues bonds in bold print meta depsidic connections between gallate residues). (Redrawn from Niemetz and Gross, 2005.)...

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