“…They take part in important metabolic processes, for example, UDP‐galactose 4‐epimerase participates in the Leloir pathway, in which it converts UDP‐galactose to UDP‐glucose (Beerens, Soetaert, & Desmet, ; Maxwell, ; Wilson & Hogness, ). Epimerases mainly constitute dimers, however, other oligomeric states can also be found; the structures of some of these proteins have been resolved (Bauer, Rayment, Frey, & Holden, ; Carbone, Schofield, Sang, Sutherland‐Smith, & Ronimus, ; Deacon, Ni, Coleman, & Ealick, ; Giraud, Leonard, Field, Berlind, & Naismith, ). In the present study, we investigated the role of the putative epimerase HgdA in Anabaena sp.…”