| Osteocalcin | Humans | The carboxylated form is one of the main organic components of the bone matrix, which constitutes 1-2% of the total b... more | 3 | Details |
| Otoferlin | Humans | Key calcium ion sensor involved in the Ca(2+)-triggered synaptic vesicle-plasma membrane fusion and in the control of... more | 1 | Details |
| Outer membrane ferric siderophore receptor | Pseudomonas aeruginosa (strain UCBPP-PA14) | Not Available | 1 | Details |
| Outer membrane porin C | Escherichia coli (strain K12) | Forms pores that allow passive diffusion of small molecules across the outer membrane. | 1 | Details |
| Outer membrane porin F | Escherichia coli (strain K12) | Forms pores that allow passive diffusion of small molecules across the outer membrane. | 5 | Details |
| Outer membrane porin G | Escherichia coli (strain K12) | Forms channels functionally larger than those of classical porins. | 2 | Details |
| Outer membrane porin, OprD family | Pseudomonas fluorescens (strain Pf-5 / ATCC BAA-477) | Not Available | 1 | Details |
| Outer membrane protein A | Escherichia coli (strain K12) | With TolR probably plays a role in maintaining the position of the peptidoglycan cell wall in the periplasm. Plays a ... more | 1 | Details |
| Outer membrane protein OprM | Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228) | The outer membrane component of the MexAB-OprM efflux system that confers multidrug resistance. Functions as the majo... more | 1 | Details |
| Outer membrane protein TolC | Escherichia coli (strain K12) | Outer membrane channel, which is required for the function of several efflux systems such as AcrAB-TolC, AcrEF-TolC, ... more | 2 | Details |
| Outer membrane protein W | Escherichia coli (strain K12) | Acts as a receptor for colicin S4. | 2 | Details |
| Outer membrane protein X | Escherichia coli (strain K12) | Not Available | 1 | Details |
| Outer membrane usher protein PapC | Escherichia coli | Involved in the export and assembly of pili subunits across the outer membrane. Forms a hexameric ring-shaped pore in... more | 2 | Details |
| Outer-membrane lipoprotein LolB | Escherichia coli (strain K12) | Plays a critical role in the incorporation of lipoproteins in the outer membrane after they are released by the LolA ... more | 1 | Details |
| Outer-membrane lipoprotein LolB | Shigella flexneri | Plays a critical role in the incorporation of lipoproteins in the outer membrane after they are released by the LolA ... more | 1 | Details |
| OX-2 membrane glycoprotein | Humans | Costimulates T-cell proliferation. May regulate myeloid cell activity in a variety of tissues | 1 | Details |
| OXA-48 carbapenemase | Klebsiella pneumoniae | Not Available | 6 | Details |
| Oxalate decarboxylase OxdC | Bacillus subtilis (strain 168) | Converts oxalate to formate and CO(2) in an O(2)-dependent reaction. Can also catalyze minor side reactions: oxalate ... more | 2 | Details |
| Oxidoreductase | Brevibacterium sterolicum | Not Available | 1 | Details |
| Oxidoreductase | Marinobacter hydrocarbonoclasticus | Not Available | 1 | Details |
| Oxidoreductase YdhF | Escherichia coli (strain K12) | May function as oxidoreductase. | 1 | Details |
| Oxidoreductase, aldo/keto reductase family | Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099) | Not Available | 1 | Details |
| Oxidoreductase, short chain dehydrogenase/reductase family | Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099) | Not Available | 1 | Details |
| Oxygen-insensitive NADPH nitroreductase | Helicobacter pylori (strain ATCC 700392 / 26695) | Reduction of a variety of nitroaromatic compounds using NADPH as source of reducing equivalents; two electrons are tr... more | 1 | Details |
| Oxysterols receptor LXR-alpha | Humans | Nuclear receptor that exhibits a ligand-dependent transcriptional activation activity. Interaction with retinoic acid... more | 11 | Details |