Identification of a growth suppression domain within the retinoblastoma gene product. (original) (raw)

  1. X Q Qin,
  2. T Chittenden,
  3. D M Livingston, and
  4. W G Kaelin
  5. Division of Neoplastic Disease Mechanisms, Dana Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115.

Abstract

To date, all naturally occurring retinoblastoma susceptibility gene (RB) mutations known to be compatible with stable protein expression map to the T/E1A and cellular protein-binding region (the "pocket" domain). This domain extends from residue 379 to 792. When full-length RB and certain truncated forms were synthesized in human RB -/- cells, we found that the minimal region necessary for overt growth suppression extended from residue 379 to 928. A functional pocket domain and sequences extending from the carboxy-terminal boundary of the pocket to the carboxyl terminus of the protein were both necessary for growth suppression. Both sets of sequences were also required for E2F binding; hence, the two functions may be linked.

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