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). Involved in regulation of apoptosis and proliferation of smooth muscle cells (PubMed:19398576). . This is the function of ENSG00000135040 (NAA35, N-alpha-acetyltransferase 35, NatC auxiliary subunit).