As part of the augmin complex, plays a role in centrosome-independent generation of spindle microtubules. The complex is required for mitotic spindle assembly through its involvement in localizing gamma-tubulin to spindle microtubules. msd1 is required for microtubule nucleation from within the mitotic spindle and for localization of Grip71 to centrosomes and mitotic spindle. Component of the augmin complex composed of dgt2, dgt3, dgt4, dgt5, dgt6, msd1, msd5 and wac (PubMed:19684111, PubMed:19369198). The complex interacts directly or indirectly with microtubules and is required for centrosome-independent generation of spindle microtubules (PubMed:19684111). Viable but females are sterile. Mutant embryos show increased mitotic spindle length during metaphase and reduced mitotic spindle density.