Human PCNT, C-His Tag Protein

Pericentrin (kendrin), also known as PCNT and pericentrin-B (PCNTB), is a protein which in humans is encoded by the PCNT gene on chromosome 21. This protein localizes to the centrosome and recruits proteins to the pericentriolar matrix (PCM) to ensure proper centrosome and mitotic spindle formation, and thus, uninterrupted cell cycle progression. This gene is implicated in many diseases and disorders, including congenital disorders such as microcephalic osteodysplastic primordial dwarfism type II (MOPDII) and Seckel syndrome. The protein encoded by this gene is expressed in the cytoplasm and centrosome throughout the cell cycle, and to a lesser extent, in the nucleus. It is an integral component of the PCM, which is a centrosome scaffold that anchors microtubule nucleating complexes and other centrosomal proteins. In one model, PCNT complexes with CEP215 and is phosphorylated by PLK1, leading to PCM component recruitment and organization, centrosome maturation, and spindle formation. The protein controls the nucleation of microtubules by interacting with the microtubule nucleation component γ-tubulin, thus anchoring the γ-tubulin ring complex to the centrosome, which is essential for bipolar spindle formation and chromosome assembly in early mitosis. This ensures normal function and organization of the centrosomes, mitotic spindles, and cytoskeleton, and by extension, regulation over cell cycle progression and checkpoints.