Reference: Du YC and Stillman B (2002) Yph1p, an ORC-interacting protein: potential links between cell proliferation control, DNA replication, and ribosome biogenesis. Cell 109(7):835-48

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Abstract


Immunoprecipitation of the origin recognition complex (ORC) from yeast extracts identified Yph1p, an essential protein containing a BRCT domain. Two Yph1p complexes were characterized. Besides ORC, MCM proteins, cell-cycle regulatory proteins, checkpoint proteins, 60S ribosomal proteins, and preribosome particle proteins were found to be associated with Yph1p. Yph1p is predominantly nucleolar and is required for 60S ribosomal subunit biogenesis and possibly for translation on polysomes. Proliferating cells depleted of Yph1p arrest in G(1) or G(2), with no cells in S phase, or significantly delay S phase progression after release from a hydroxyurea arrest. Yph1p levels decline as cells commit to exit the cell cycle, and levels vary depending on energy source. Yph1p may link cell proliferation control to DNA replication, ribosome biogenesis, and translation on polysomes.

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Journal Article | Research Support, U.S. Gov't, P.H.S.
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Du YC, Stillman B
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