GCP5-Mod21 is a non-core subunit of the larger gamma-tubulin ring complex that effects microtubule nucleation from both centrosomal and non-centrosomal sites. This subunit, unlike GCP2 and and GCP3 and others, is not essential for viability in the fission yeast, and may not be expressed in very high concentrations. Fission yeast can form a large gamma-Tubulin complex C similar to that found in higher eukaryotes and this complex is important for maintaining normal levels of microtubule nucleation in vivo [1,2]. This entry represents the C-terminal domain of Mod21 from fission yeast. This domain may consist of an alpha-helical bundle.

1: Noncore components of the fission yeast gamma-tubulin complex. Anders A, Lourenco PC, Sawin KE; Mol Biol Cell. 2006;17:5075-5093. PMID:17021256

2: Promiscuous Binding of Microprotein Mozart1 to gamma-Tubulin Complex Mediates Specific Subcellular Targeting to Control Microtubule Array Formation. Huang TL, Wang HJ, Chang YC, Wang SW, Hsia KC; Cell Rep. 2020;31:107836. PMID:32610137