Component of the Mediator complex, a coactivator involved in the regulated transcription of nearly all RNA polymerase II-dependent genes. Mediator functions as a bridge to convey information from gene-specific regulatory proteins to the basal RNA polymerase II transcription machinery. Mediator is recruited to promoters by direct interactions with regulatory proteins and serves as a scaffold for the assembly of a functional preinitiation complex with RNA polymerase II and the general transcription factors (By similarity). Required for transcription of genes encoding galactose-metabolizing enzymes. Essential for normal growth on nonfermentable carbon sources, for sporulation and mating. Component of the Mediator complex. GAL11 lacks a DNA-domain, it probably complexes with GAL4 that has the capacity to bind DNA. Association between GAL11 and GAL4 may serve to expedite phosphorylation of GAL4. Belongs to the Mediator complex subunit 15 family.