Auxillary component of the N-terminal acetyltransferase C (NatC) complex which catalyzes acetylation of N-terminal methionine residues (PubMed:19398576, PubMed:37891180). N-terminal acetylation protects proteins from ubiquitination and degradation by the N-end rule pathway (PubMed:37891180). {ECO:0000269|PubMed:19398576, ECO:0000269|PubMed:37891180}. This is the function of NAA38 (N-alpha-acetyltransferase 38, NatC auxiliary subunit, Ensembl gene identifier ENSG00000183011).