FUNCTION: Required for the first step in the synthesis of diphthamide, a post-translational modification of histidine which occurs in translation elongation factor 2 (EEF2). When overexpressed, suppresses colony formation ability and growth rate of ovarian cancer cells. Acts also as a tumor suppress...
                        FUNCTION: Required for the first step in the synthesis of diphthamide, a post-translational modification of histidine which occurs in translation elongation factor 2 (EEF2). When overexpressed, suppresses colony formation ability and growth rate of ovarian cancer cells. Acts also as a tumor suppressor in lung and breast cancers (By similarity). Plays a role in embryonic growth, organogenesis and postnatal survival (By similarity). {ECO:0000250|UniProtKB:Q5NCQ5, ECO:0000269|PubMed:10519411}.
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                        GO - Biological processes (BP): 
                        peptidyl-diphthamide biosynthetic process from peptidyl-histidine [GO:0017183]...
                        peptidyl-diphthamide biosynthetic process from peptidyl-histidine [GO:0017183]
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                        GO - Molecular function (MF): 
                        2-(3-amino-3-carboxypropyl)histidine synthase activity [GO:0090560]...
                        2-(3-amino-3-carboxypropyl)histidine synthase activity [GO:0090560]
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                        GO - Cellular component (CC): 
                        cell junction [GO:0030054]; cytosol [GO:0005829]; nucleoplasm [GO:0005654]...
                        cell junction [GO:0030054]; cytosol [GO:0005829]; nucleoplasm [GO:0005654]
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