| Oncostatin-M-specific receptor subunit beta | Humans | Functions as a shared membrane-bound signal-transducing subunit in two distinct receptor complexes, the type II OSM r... more | 1 | Details |
| Opioid growth factor receptor | Humans | Receptor for opioid growth factor (OGF), also known as Met-enkephalin. Seems to be involved in growth regulation | 1 | Details |
| Orange carotenoid-binding protein | Arthrospira maxima | Acts as a blue-light photoreceptor and photo-protectant. Essential for inhibiting damaged induced by excess blue-gree... more | 1 | Details |
| Orexin receptor type 2 | Humans | G protein-coupled receptor that binds neuropeptides orexin-A and orexin-B, two neuropeptides derived from a common pr... more | 12 | Details |
| Orexin/Hypocretin receptor type 1 | Humans | G protein-coupled receptor that binds the neuropeptide orexin-A with high affinity, and orexin-B with lower affinity,... more | 9 | Details |
| Orf protein | Escherichia coli | The B subunit is responsible for the binding of the holotoxin to specific receptors on the target cell surface, such ... more | 5 | Details |
| Orf1a polyprotein | SARS-CoV | Not Available | 1 | Details |
| Organic anion transporter 3 | Humans | Functions as an organic anion/dicarboxylate exchanger that couples organic anion uptake indirectly to the sodium grad... more | 195 | Details |
| Organic anion transporter 7 | Humans | Sodium-independent organic anion transporter, exhibits high specificity for sulfated conjugates of xenobiotics and st... more | 1 | Details |
| Organic cation/carnitine transporter 2 | Humans | Sodium-ion dependent, high affinity carnitine transporter. Involved in the active cellular uptake of carnitine. Trans... more | 63 | Details |
| Organic hydroperoxide resistance protein | Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228) | Not Available | 1 | Details |
| Organic hydroperoxide resistance protein, putative | Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961) | Not Available | 1 | Details |
| Organic solute transporter subunit alpha | Humans | Essential component of the OST-alpha/OST-beta complex, a heterotetramer that acts as the intestinal basolateral trans... more | 4 | Details |
| Organic solute transporter subunit beta | Humans | Essential component of the OST-alpha/OST-beta complex, a heterotetramer that acts as the intestinal basolateral trans... more | 4 | Details |
| Ornithine aminotransferase | Plasmodium falciparum (isolate 3D7) | The enzyme has a very narrow substrate specificity and can only catalyze the transamination of alpha-ketoglutarate wi... more | 1 | Details |
| Ornithine aminotransferase, mitochondrial | Humans | Catalyzes the reversible interconversion of L-ornithine and 2-oxoglutarate to L-glutamate semialdehyde and L-glutamate | 4 | Details |
| Ornithine carbamoyltransferase subunit I | Escherichia coli (strain K12) | Reversibly catalyzes the transfer of the carbamoyl group from carbamoyl phosphate (CP) to the N(epsilon) atom of orni... more | 1 | Details |
| Ornithine cyclodeaminase | Pseudomonas putida (strain KT2440) | Catalyzes the conversion of L-ornithine into L-proline with release of ammonia. Is likely involved in the L-ornithine... more | 1 | Details |
| Ornithine decarboxylase | Humans | Catalyzes the first and rate-limiting step of polyamine biosynthesis that converts ornithine into putrescine, which i... more | 13 | Details |
| Ornithine decarboxylase antizyme 1 | Humans | Ornithine decarboxylase (ODC) antizyme protein that negatively regulates ODC activity and intracellular polyamine bio... more | 1 | Details |
| Ornithine transcarbamylase, mitochondrial | Humans | Catalyzes the second step of the urea cycle, the condensation of carbamoyl phosphate with L-ornithine to form L-citru... more | 4 | Details |
| Orotate phosphoribosyltransferase | Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720) | Catalyzes the transfer of a ribosyl phosphate group from 5-phosphoribose 1-diphosphate to orotate, leading to the for... more | 3 | Details |
| Orotidine 5'-phosphate decarboxylase | Escherichia coli (strain K12) | Catalyzes the decarboxylation of orotidine 5'-monophosphate (OMP) to uridine 5'-monophosphate (UMP). | 3 | Details |
| Orotidine 5'-phosphate decarboxylase | Bacillus subtilis (strain 168) | Catalyzes the decarboxylation of orotidine 5'-monophosphate (OMP) to uridine 5'-monophosphate (UMP). | 1 | Details |
| Osmotically inducible protein C | Thermus thermophilus | Not Available | 1 | Details |