The function of Ensembl gene identifier ENSG00000185664 (PMEL, premelanosome protein) is as follows. Forms physiological amyloids that play a central role in melanosome morphogenesis and pigmentation. The maturation of unpigmented premelanosomes from stage I to II is marked by assembly of processed amyloidogenic fragments into parallel fibrillar sheets, which elongate the vesicle into a striated ellipsoidal shape. In pigmented stage III and IV melanosomes, the amyloid matrix serves as a platform where eumelanin precursors accumulate at high local concentrations for pigment formation. May prevent pigmentation-associated toxicity by sequestering toxic reaction intermediates of eumelanin biosynthesis pathway. {ECO:0000269|PubMed:11694580, ECO:0000269|PubMed:21962903, ECO:0000269|PubMed:26387950, ECO:0000269|PubMed:26694611, ECO:0000269|PubMed:28272432, ECO:0000269|PubMed:30988362}. Represents a potent melanoma-specific antigen. Among melanoma non-mutated self-peptides, G9-154 (KTWGQYWQV), G9-209 (ITDQVPFSV) and G9-280 (YLEPGPVTA), appear to act as immunodominant common epitopes that stimulate anti-tumor immune response mediated by HLA-A-restricted cytotoxic T cells. {ECO:0000269|PubMed:7706734, ECO:0000269|PubMed:8022805}.