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arg-2/CPA1 leader peptide In this family there are Leaders Peptides involved in the regulation the glutaminase subunit (small subunit) of arginine-specific carbamoyl phosphate synthetase. In Neurospora crassa it is a small upstream ORF of 24 codon above the arg-2 locus. In yeast it is the leader peptide of the CPA1 gene. The 5' region of CPA1 mRNA contains a 25 codon upstream open reading frame. The leader peptide, the product of the upstream open reading frame, plays an essential, negative role in the specific repression of CPA1 by arginine.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",