Required for cytoplasmic astral microtubule growth during mitosis. Involved in localizing components of the gamma-tubulin complex to the non-spindle pole body (non-SPB) microtubule organizing centers (MTOCs). Required for new microtubule nucleation from non-SPB sites during interphase. Interacts with mcp6. Localizes at the interphase MTOC (iMTOC) and at the equatorial MTOC (eMTOC) at the end of mitosis.