As part of the augmin complex, plays a role in centrosome-independent generation of spindle microtubules (PubMed:18443220). The complex is required for mitotic spindle assembly through its involvement in localizing gamma-tubulin to spindle microtubules (PubMed:17412918). Component of the augmin complex composed of dgt2, dgt3, dgt4, dgt5, dgt6, msd1, msd5 and wac (PubMed:18443220, PubMed:19369198). The complex interacts directly or indirectly with microtubules and is required for centrosome-independent generation of spindle microtubules (PubMed:18443220). The name 'dim gamma-tubulin 4' derives from the decreased gamma-tubulin staining of the spindle pole seen following RNAi-mediated knockdown of dgt4 in S2 cells. Truncated N-terminus.