Cloning and characterization of SNAP50, a subunit of the snRNA-activating protein complex SNAPc

Henry, R. W., Ma, B., Sadowski, C. L., Kobayashi, R., Hernandez, N. (December 1996) Cloning and characterization of SNAP50, a subunit of the snRNA-activating protein complex SNAPc. Embo J, 15 (24). pp. 7129-36. ISSN 0261-4189 (Print)

URL: http://www.ncbi.nlm.nih.gov/pubmed/9003788

Abstract

The human RNA polymerase II and III snRNA promoters share a common basal element, the proximal sequence element (PSE), which is recognized by a complex we refer to as the snRNA-activating protein complex (SNAPc). Biochemical purifications suggest that SNAPc is composed of at least four polypeptides of 43, 45, 50 and 190 kDa, as well as variable amounts of the TATA box binding protein, TBP. cDNAs encoding the 43 and 45 kDa subunits, SNAP43 and SNAP45, have been isolated, but there is no evidence that either of these subunits contacts DNA. Here we report the isolation of cDNAs encoding the 50 kDa subunit of SNAPc, SNAP50. The open reading frame predicts a 411 amino acid protein, which contains two potential zinc finger motifs. Depletions with anti-SNAP50 antibodies inhibit RNA polymerase II and III snRNA gene transcription in vitro. SNAP50 interacts with SNAP43 in co-immunoprecipitation experiments, but not with SNAP45 or TBP. UV cross-linking experiments suggest that SNAP50 contacts DNA in the SNAP complex. These results are consistent with the same core SNAP complex recognizing the PSEs of RNA polymerase II and III snRNA promoters, and provide an initial view of the architecture of the SNAP complex.

Item Type: Paper
Uncontrolled Keywords: Amino Acid Sequence Base Sequence Cloning, Molecular DNA, Complementary DNA-Binding Proteins Humans Molecular Sequence Data Protein Binding Proteins/ genetics/metabolism RNA Polymerase II/metabolism RNA Polymerase III/metabolism RNA, Small Nuclear/genetics RNA-Binding Proteins/ genetics Research Support, U.S. Gov't, P.H.S. Transcription Factors/metabolism Transcription, Genetic
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > SNAP protein
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > snRNA
CSHL Authors:
Communities: CSHL labs > Hernandez lab
CSHL labs > Kobayashi lab
Depositing User: Matt Covey
Date: 16 December 1996
Date Deposited: 21 May 2014 20:09
Last Modified: 21 May 2014 20:09
PMCID: PMC452539
URI: http://repository.cshl.edu/id/eprint/30175

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