한빛사 논문
Jung-Eun Parka, Lingjun Menga, Eun Kyoung Ryub, Kunio Nagashimac, Ulrich Baxac, Jeong Kyu Bangb, and Kyung S. Leea,*
aLaboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA; bDivision of Magnetic Resonance, Korea Basic Science Institute, Cheongju, Republic of Korea; cElectron Microscopy Laboratory, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
*Corresponding author
Abstract
Polo-like kinase 4 (Plk4) is a key regulator of centriole biogenesis. Studies have shown that Plk4 undergoes dynamic relocalization from a ring-like pattern around a centriole to a dot-like morphology at the procentriole assembly site and this event is central for inducing centriole biogenesis. However, the detailed mechanisms underlying Plk4’s capacity to drive its symmetry-breaking ring-to-dot relocalization remain largely unknown. Here, we showed that Plk4 self-initiates this process in an autophosphorylation–dependent manner and that STIL, its downstream target, is not required for this event. Time-dependent analyses with mEOS-fused photoconvertible Plk4 revealed that a portion of ring-state Plk4 acquires a capacity, presumably through autophosphorylation, to linger around a centriole, ultimately generating a dot-state morphology. Interestingly, Plk4 WT, but not its catalytically inactive mutant, showed the ability to form a nanoscale spherical assembly in the cytosol of human cells or heterologous E. coli, demonstrating its autophosphorylation-dependent self-organizing capacity. At the biochemical level, Plk4 – unlike its N-terminal βTrCP degron motif – robustly autophosphorylated the PC3 SSTT motif within its C-terminal cryptic polo-box, an event critical for inducing its physical clustering. Additional in vivo experiments showed that although STIL was not required for Plk4’s initial ring-to-dot conversion, coexpressed STIL greatly enhanced Plk4’s ability to generate a spherical condensate and recruit Sas6, a major component of the centriolar cartwheel structure. We propose that Plk4’s autophosphorylation-induced clustering is sufficient to induce its ring-to-dot localization conversion and that subsequently recruited STIL potentiates this process to generate a procentriole assembly body critical for Plk4-dependent centriole biogenesis.
KEYWORDS: Polo-like kinase 4, protein phosphorylation, centriole biogenesis, centrosomes, phase separation
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