The function of GALNTL5 (polypeptide N-acetylgalactosaminyltransferase like 5, Ensembl gene identifier ENSG00000106648) is as follows. Probable inactive glycosyltransferase required during spermatid development. May participate in protein loading into the acrosomes and accumulation of ubiquitin-proteasome systems around the head-tail coupling apparatus region.