The promyelocytic leukemia gene product (PML) forms stable complexes with the retinoblastoma protein.

Molecular and Cellular Biology
M AlcalayP G Pelicci

Abstract

PML is a nuclear protein with growth-suppressive properties originally identified in the context of the PML-retinoic acid receptor alpha (RAR alpha) fusion protein of acute promyelocytic leukemia. PML localizes within distinct nuclear structures, called nuclear bodies, which are disrupted by the expression of PML-RAR alpha. We report that PML colocalizes with the nonphosphorylated fraction of the retinoblastoma protein (pRB) within nuclear bodies and that pRB is delocalized by PML-RAR alpha expression. Both PML and PML-RAR alpha form complexes with the nonphosphorylated form of pRB in vivo, and they interact with the pocket region of pRB. The regions of PML and PML-RAR alpha involved in pRB binding differ; in fact, the B boxes and the C-terminal region of PML, the latter of which is not present in PML-RAR alpha, are essential for the formation of stable complexes with pRB. Functionally, PML abolishes activation of glucocorticoid receptor-regulated transcription by pRB, whereas PML-RAR alpha further increases it. Our results suggest that PML may be part of transcription-regulatory complexes and that the oncogenic potential of the PML-RAR alpha protein may derive from the alteration of PML-regulated transcription.

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