Cysteine and tyrosine-rich protein 1 is a protein that in humans is encoded by the CYYR1gene and is located on chromosome 21, location 21q21.2. This protein has a function that is not presently understood.
The product of the gene is a single pass type 1 transmembrane protein with four exons and a very large intron of 85.8 kb and coding for a protein containing 154 amino acids. The most prominent feature identified in the protein is a central, unique cysteine and tyrosine-rich protein domain, on portion of the protein which is located inside the cell. This domain is found to be strongly conserved from lower vertebrates (fishes) to humans but is absent in bacteria and invertebrates.
CYYR1 has been shown to increase glutathione level in yeast cells when complementing a defect in GSH uptake in yeast cells that lack Hgt1p, the primary yeast GSH uptake transporter. However, the CYYR1 gene is not naturally found in yeast, so function of CYYR1 is still unknown.
^Reymond A, Camargo AA, Deutsch S, Stevenson BJ, Parmigiani RB, Ucla C, Bettoni F, Rossier C, Lyle R, Guipponi M, de Souza S, Iseli C, Jongeneel CV, Bucher P, Simpson AJ, Antonarakis SE (May 2002). "Nineteen additional unpredicted transcripts from human chromosome 21". Genomics. 79 (6): 824–32. PMID12036297. doi:10.1006/geno.2002.6781.
^ abVitale L, Casadei R, Canaider S, Lenzi L, Strippoli P, D'Addabbo P, Giannone S, Carinci P, Zannotti M (Jun 2002). "Cysteine and tyrosine-rich 1 (CYYR1), a novel unpredicted gene on human chromosome 21 (21q21.2), encodes a cysteine and tyrosine-rich protein and defines a new family of highly conserved vertebrate-specific genes". Gene. 290 (1–2): 141–51. PMID12062809. doi:10.1016/S0378-1119(02)00550-4.
Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, et al. (1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. PMID9373149. doi:10.1016/S0378-1119(97)00411-3.