This entry represents LYR motif-containing proteins, including LYR motif-containing protein 2 from animals, whose function is not clear, and Cup1 (caffeine unstable phenotype 1, previously known as uncharacterised protein C17G9.13c) from S. pombe [1]. Cup1 has been characterised; it is a mitochondrial protein whose silencing by heterochromatin island formation results in caffeine resistance. LYR-motif containing proteins are basic polypeptides carrying a conserved tripeptide L-Y-R (leucine/tyrosine/arginine) sequence close to the N-terminus in addition to some basic arginine/lysine residues and a highly-conserved phenylalanine downstream of the LYR motif [2].

1: Epigenetic gene silencing by heterochromatin primes fungal resistance. Torres-Garcia S, Yaseen I, Shukla M, Audergon PNCB, White SA, Pidoux AL, Allshire RC; Nature. 2020;585:453-458. PMID:32908306

2: Eukaryotic LYR Proteins Interact with Mitochondrial Protein Complexes. Angerer H; Biology (Basel). 2015;4:133-150. PMID:25686363