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Published on: November 26, 2013
A short ORF-encoded transcriptional regulator
Minseob Koh1,2, Insha Ahmad1, Yeonjin Ko1
1Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037.
Researchers developed a new method to identify interactions of short open reading frame (ORF)-encoded peptides (SEPs). This approach led to the discovery of SEHBP, a novel microprotein functioning as a short ORF-encoded transcription factor.
Area of Science:
- Molecular Biology
- Genomics
- Proteomics
Background:
- Mammalian genomes contain numerous short open reading frame (ORF)-encoded peptides (SEPs) with identified physiological roles.
- A general method for defining SEP interactomes is currently lacking, hindering further research into this emerging protein class.
Purpose of the Study:
- To develop a general method for identifying SEP cellular interaction partners.
- To discover novel SEPs and elucidate their functions.
Main Methods:
- Genetic incorporation of the photo-crosslinking noncanonical amino acid AbK into SEP transgenes.
- Affinity-based methods for identifying SEP cellular interaction partners.
- Survey of seven SEPs to identify novel candidates.
Main Results:
- A facile method for identifying SEP interactomes was established.
- Discovery of short ORF-encoded histone binding protein (SEHBP), a conserved microprotein.
- SEHBP interacts with chromatin-associated proteins and localizes to discrete genomic loci.
- Overexpression of SEHBP in human cells induces a robust transcriptional program.
Conclusions:
- The developed method provides a straightforward approach to define the physiological roles of SEPs.
- SEHBP is identified as a short ORF-encoded transcription factor, highlighting its role in gene regulation.
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