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              <p>Abstract Branching enzymes (BE) are responsible for the formation of branching points at the 1,6 position in glycogen and starch, by catalyzing the cleavage of α-1,4-linkages and the subsequent transfer by introducing α-1,6-linked glucose branched points. BEs are found in the large GH13 family, eukaryotic BEs being mainly classified in the GH13_8 subfamily, GH13_9 grouping almost exclusively prokaryotic enzymes. With the aim of contributing to the understanding of the mode of recognition and action of the enzymes belonging to GH13_8, and to the understanding of features distinguishing these enzymes from those belonging to subfamily 13_9 we solved the crystal structure of the glycogen branching enzyme (GBE) from the yeast Candida glabrata, CgGBE, in ligand free forms and in complex with a maltotriose. The structures revealed the presence of a domain already observed in Homo sapiens and Oryza sativa BEs and that we named α-helical N-terminal domain, in addition to the three conserved domains found in BE. We confirmed by phylogenetic analysis that this α-helical N-terminal domain is always present in the GH13_8 enzymes suggesting that it could actually present a signature for this subfamily. We identified two binding sites (BS) in the α-helical N-terminal domain and in the carbohydrate binding module 48 (CBM48), respectively, which show a unique structural organization only present in the Saccharomycotina phylum. Our structural and phylogenetic investigation provides new insight into the structural characterization of GH13_8 GBE revealing unique structural features only present in the Saccharomycotina phylum thereby conferring original properties to this group of enzymes.</p>
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