This is a small family of proteins from Saccharomyces and related species. The function is not known but member proteins are highly induced in zinc-depleted conditions [1,2] and have increased expression in NAP1-deletion mutants [1]. The S. cerevisiae genes are named VEL by association with Velum formation in the wine making process http://www.ajevonline.org/content/48/1/55.abstract

1: Genome-wide expression analysis of NAP1 in Saccharomyces cerevisiae. Ohkuni K, Shirahige K, Kikuchi A; Biochem Biophys Res Commun. 2003;306:5-9. PMID:12788058

2: Response of Schizosaccharomyces pombe to zinc deficiency. Dainty SJ, Kennedy CA, Watt S, Bahler J, Whitehall SK; Eukaryot Cell. 2008;7:454-464. PMID:18203864