| Description | This entry contains the human protein C7orf24 ( ) which has been used as a cancer marker with a potential role in cell proliferation. It has been characterised as gamma-glutamyl cyclotransferase (GGCT), a homodimer of two 21kDa subunits, that catalyses the formation of 5-oxoproline (2-pyrrolidone-5-carboxylic acid, pyroglutamic acid) from gamma-glutamyl dipeptides ( ) [ ].L-gamma-glutamyl-L-amino acid ->5-oxoproline + L-amino acidThe structure of GGCT has been solved. Its topology is unrelated to other enzymes associated with cyclotransferase-like activity and its structure has been termed the GGCT-fold, which appears to be related to the BtrG-like superfamily. A potential active site pocket contains a highly conserved glutamic acid (Glu(98)), which when converted to either Ala or Gln completely inactivates the enzyme without altering the overall fold [ ].This entry also includes GGCT gliK, GGCT aclK and GGCT verK from fungi. GGCT gliK is part of the gene cluster that mediates the biosynthesis of gliotoxin, a member of the epipolythiodioxopiperazine (ETP) class of toxins characterised by a disulfide bridged cyclic dipeptide [ , ]. GGCT aclK mediates the biosynthesis of aspirochlorine []. GGCT verK mediates the biosynthesis of 11'-deoxyverticillin A, one of the dimeric epipolythiodioxopiperazines (ETPs) from the verticillin family that act as mycotoxins []. | Name | Gamma-glutamylcyclotransferase |
| Short Name | G-Glutamylcylcotransferase | Type | Family |
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