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The complete primary structure of the human snRNP E protein
D R Stanford1, M Kehl, C A Perry
1Department of Biochemistry and Molecular Biology, Mayo Clinic/Foundation, Rochester, MN 55905.
Nucleic Acids Research
|November 25, 1988
Summary
Researchers identified the full coding sequence for the snRNP E protein, a core component of U-family small nuclear ribonucleoproteins (snRNPs). This protein shows limited similarity to other snRNP proteins but shares regions with eukaryotic ribosomal proteins.
Area of Science:
- Molecular Biology
- Protein Biochemistry
- Genetics
Background:
- Small nuclear ribonucleoproteins (snRNPs) are essential for pre-mRNA splicing.
- The snRNP E protein is a core component of the U family of snRNPs.
- Understanding snRNP protein structure is crucial for deciphering spliceosome assembly and function.
Purpose of the Study:
- To isolate and characterize the cDNA encoding the human snRNP E protein.
- To determine the complete amino acid sequence of the snRNP E protein.
- To investigate potential functional relationships through sequence homology.
Main Methods:
- Screening of a human teratoma cDNA library.
- Isolation and sequencing of a cDNA clone.
- Comparison with pseudogene sequences and primer extension analysis.
- Analysis of open reading frame and predicted amino acid sequence.
Main Results:
- A nearly full-length cDNA clone for the snRNP E protein was isolated.
- The longest open reading frame predicted a basic 92 amino acid protein.
- The predicted amino acid sequence showed no extensive similarity to other snRNP proteins.
- Regions of similarity were found between the E protein and a eukaryotic ribosomal protein.
Conclusions:
- The complete coding sequence for the human snRNP E protein has been determined.
- The snRNP E protein sequence is unique among known snRNP proteins.
- The identified similarities suggest potential functional or evolutionary links to ribosomal proteins.