This is a family of bacterial ferritin-like substances that also includes a C-terminal domain of VioB, polyketide synthase enzymes, that make up one of the key components of the violacein biosynthesis pathway. Violacein is a purple-coloured, broad-spectrum antibacterial pigment.

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2: Genetic analysis of violacein biosynthesis by Chromobacterium violaceum. Antônio RV, Creczynski-Pasa TB; Genet Mol Res. 2004;3:85-91. PMID:15100990