title: Homologues of 26S proteasome subunits are regulators of transcription and translation.
abstract: Single copies of an alpha-helical-rich motif are demonstrated to be present within subunits of the large multiprotein 26S proteasome and eukaryotic initiation factor-3 (eIF3) complexes, and within proteins involved in transcriptional regulation. In addition, p40 and p47 subunits of eIF3 are shown to be homologues of the proteasome subunit Mov34, and transcriptional regulators JAB1/pad1. Finally, the proteasome subunit S5a and the p44 subunit of the basal transcription factor IIH (TFIIH) are identified as homologues. The presence of homologous, and sometimes identical, proteins in contrasting functional contexts suggests that the large multisubunit complexes of the 26S proteasome, eIF3 and TFIIH perform overlapping cellular roles.
authors.affiliation: Department of Biology-BSBW, Texas A&M University, College Station 77843, USA.
authors.forename: L
authors.initials: L
authors.lastname: Aravind
authors.forename: C P
authors.initials: CP
authors.lastname: Ponting
mesh_terms: D000595:Amino Acid Sequence; D008969:Molecular Sequence Data; D010447:Peptide Hydrolases / Q000737:chemistry* / Q000378:metabolism; D046988:Proteasome Endopeptidase Complex; D014176:Protein Biosynthesis; D016415:Sequence Alignment; D051758:Transcription Factor TFIIH; D014157:Transcription Factors / Q000378:metabolism; D019473:Transcription Factors, TFII; D014158:Transcription, Genetic
chemical_list: D014157:Transcription Factors; D019473:Transcription Factors, TFII; D051758:Transcription Factor TFIIH; D010447:Peptide Hydrolases; D046988:Proteasome Endopeptidase Complex; C061553:ATP dependent 26S protease