Tubulin is the major constituent of microtubules. The gamma chain is found at microtubule organizing centers (MTOC) such as the spindle poles or the centrosome. Pericentriolar matrix component that regulates alpha/beta chain minus-end nucleation, centrosome duplication and spindle formation (By similarity). Interacts with TUBGCP2, TUBGCP3 and B9D2. Interacts with CDK5RAP2; the interaction is leading to centrosomal localization of TUBG1 and CDK5RAP2. Interacts with PIFO. Interacts with SAS6 and NUP62 at the centrosome (By similarity). Interacts with EML3 (phosphorylated form) and HAUS8 (By similarity). Localizes to mitotic spindle microtubules. Phosphorylation at Ser-131 by BRSK1 regulates centrosome duplication, possibly by mediating relocation of gamma-tubulin and its associated proteins from the cytoplasm to the centrosome. Belongs to the tubulin family.