In centrosomes, the gamma-tubulin ring complexes (gamma-TuRC) located on the surface are essential as the nucleation site for the growing (with polarity) of microtubules.
However, I see that there is also a centriole (made by 2 centriole units in T-shape structure) and a centrosomal matrix. According to Wikipedia, it seems without centrioles, the cells can still function normally and grow (please correct me if I am incorrect), and it seems I cannot find much information in the internet suggesting the use of both centrioles and centrosomal matrix.
Therefore, I would like to ask what are there functional significance? And I would like to ask if we are able to make a synthetic sphere with many gamma-TuRC on its surface (without any rejection), can the cell perform a normal cell cycle?