title: The 'LXCXE' hydropathic superfamily of ligands for retinoblastoma protein: a proposal.
abstract: The present study reports structural similarities between viral oncoproteins, growth factors belonging to the insulin family, members of the steroid/thyroid receptor superfamily, a D-type cyclin, the Elf-1 transcription factor and Bcl oncoproteins in regions that have been shown or proposed to mediate complex formation of these proteins with the tumor suppressor retinoblastoma protein (RB). This relationship predicts a common intracellular pathway for mitogenic signals and molecules promoting cell survival. Conversely, the structural evidence described here suggests that RB may play a central role both at the boundary between negative and positive cell growth regulation as well as in developmental decisions between cell death and cell survival.
authors.affiliation: Molecular Concepts Research (MCR), Munich, Germany.
authors.forename: R T
authors.initials: RT
authors.lastname: Radulescu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017209:Apoptosis; D002470:Cell Survival; D016213:Cyclins / Q000737:chemistry / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D008024:Ligands; D008969:Molecular Sequence Data; D009856:Oncogene Proteins, Viral / Q000737:chemistry / Q000378:metabolism; D010446:Peptide Fragments / Q000737:chemistry / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000737:chemistry / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2; D011987:Receptors, Steroid / Q000737:chemistry / Q000378:metabolism; D016160:Retinoblastoma Protein / Q000737:chemistry / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D013002:Somatomedins / Q000737:chemistry / Q000378:metabolism; D014157:Transcription Factors / Q000737:chemistry / Q000378:metabolism
chemical_list: D016213:Cyclins; D004268:DNA-Binding Proteins; D008024:Ligands; D009856:Oncogene Proteins, Viral; D010446:Peptide Fragments; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D011987:Receptors, Steroid; D016160:Retinoblastoma Protein; D013002:Somatomedins; D014157:Transcription Factors