| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P38219 | Obg-like ATPase 1; | OLA1; YBR025C; | NP_009581.1; | 394 | yeast |
| P38325 | Mitochondrial outer membrane protein OM14; Outer membrane protein of 14 kDa; | OM14; YBR230C; | NP_009789.1; | 134 | yeast |
| P16547 | Mitochondrial outer membrane protein OM45; Outer membrane protein of 45 kDa; | OM45; YIL136W; | NP_012130.1; | 393 | yeast |
| P36163 | Mitochondrial metalloendopeptidase OMA1; EC 3.4.24.-; | OMA1; YKR087C; | NP_013013.2; | 345 | yeast |
| Q06668 | Methyltransferase OMS1, mitochondrial; EC 2.1.1.-; OXA1 multicopy suppressor 1; | OMS1; YDR316W; | NP_010602.3; | 471 | yeast |
| Q08202 | Protein OPI10; Overproducer of inositol protein 10; | OPI10; YOL032W; | NP_014610.1; | 246 | yeast |
| P21957 | Transcriptional repressor OPI1; Negative regulator of phospholipid biosynthesis; Overproducer of inositol protein 1; | OPI1; YHL020C; | NP_011843.1; | 404 | yeast |
| Q07521 | Putative uncharacterized protein OPI6; | OPI6; YDL096C; | NULL | 108 | yeast |
| P87286 | Putative uncharacterized protein OPI7; | OPI7; YDR360W; | NULL | 144 | yeast |
| A0A023PZI1 | Putative uncharacterized protein OPI11; Overproducer of inositol protein 11; | OPI11; YPR044C; | NULL | 117 | yeast |
| P36129 | Putative uncharacterized protein OPI8; | OPI8; YKR035C; | NULL | 213 | yeast |
| O94084 | Putative uncharacterized protein OPI9; | OPI9; YLR338W; | NULL | 285 | yeast |
| P28273 | 5-oxoprolinase; EC 3.5.2.9; 5-oxo-L-prolinase; 5-OPase; Pyroglutamase; | OXP1; YKL215C; | NP_012707.1; | 1286 | yeast |
| P40897 | Oligopeptide transporter 1; High affinity glutathione transporter 1; | OPT1; GSH11 HGT1; YJL212C; | NP_012323.1; | 799 | yeast |
| Q06593 | Oligopeptide transporter 2; | OPT2; YPR194C; | NP_015520.1; | 877 | yeast |
| P38271 | Protein OPY1; Overproduction-induced pheromone-resistant yeast protein 1; | OPY1; YBR129C; | NP_009687.1; | 328 | yeast |
| Q06810 | Protein OPY2; Overproduction-induced pheromone-resistant protein 2; | OPY2; YPR075C; | NP_015400.1; | 360 | yeast |
| P54784 | Origin recognition complex subunit 1; Origin recognition complex 120 kDa subunit; | ORC1; YML065W; | NP_013646.1; | 914 | yeast |
| P32833 | Origin recognition complex subunit 2; Origin recognition complex 71 kDa subunit; | ORC2; RRR1 SIR5; YBR060C; | NP_009616.1; | 620 | yeast |
| P54790 | Origin recognition complex subunit 3; Origin recognition complex 62 kDa subunit; | ORC3; OAF1 OIF1; YLL004W; | NP_013097.1; | 616 | yeast |
