| PF01729 | QRPTase_C | Quinolinate phosphoribosyl transferase, C-terminal domain | Q1J647 |
| PF02547 | Queuosine_synth | Queuosine biosynthesis protein | O32054 |
| PF02677 | QueH | Epoxyqueuosine reductase QueH | Q9WZJ0 |
| PF02749 | QRPTase_N | Quinolinate phosphoribosyl transferase, N-terminal domain | Q1J647 |
| PF04484 | QWRF | QWRF family | |
| PF06177 | QueT | QueT transporter | |
| PF06508 | QueC | Queuosine biosynthesis protein QueC | O31675 |
| PF08331 | QueG_DUF1730 | Epoxyqueuosine reductase QueG, DUF1730 | P97030 |
| PF08880 | QLQ | QLQ | P51532 |
| PF08992 | QH-AmDH_gamma | Quinohemoprotein amine dehydrogenase, gamma subunit | Q8VUS8 |
| PF09099 | Qn_am_d_aIII | Quinohemoprotein amine dehydrogenase, alpha subunit domain III | Q8VUT0 |
| PF09100 | Qn_am_d_aIV | Quinohemoprotein amine dehydrogenase, alpha subunit domain IV | Q8VUT0 |
| PF09796 | QCR10 | Ubiquinol-cytochrome-c reductase complex subunit (QCR10) | Q6CC60 |
| PF10343 | Q_salvage | Queuosine salvage protein | Q5T6V5 |
| PF12038 | QTMAN_N | tRNA-queuosine alpha-mannosyltransferase N-terminal | |
| PF12843 | QSregVF_b | Putative quorum-sensing-regulated virulence factor | |
| PF13652 | QSregVF | Putative quorum-sensing-regulated virulence factor | Q9HY15 |
| PF14027 | Questin_oxidase | Questin oxidase-like | |
| PF14489 | QueF | QueF-like protein | O31678 |
| PF14819 | QueF_N | Nitrile reductase, 7-cyano-7-deazaguanine-reductase N-term | Q9KTK0 |
| PF14930 | Qn_am_d_aII | Quinohemoprotein amine dehydrogenase, alpha subunit domain II | Q8VUT0 |
| PF15884 | QIL1 | MICOS complex subunit MIC13, QIL1 | |
| PF16274 | Qua1 | Qua1 domain | O75525 |
| PF16551 | Quaking_NLS | Putative nuclear localisation signal of quaking | |
| PF17064 | QVR | Quiver family u-PAR/Ly-6-like domain | |
| PF18108 | QSOX_Trx1 | QSOX Trx-like domain | Q8BND5 |
| PF18226 | QslA | LasR-specific antiactivator QslA | Q9I494 |
| PF18874 | QPE | QPE domain | Q836L2 |
| PF19297 | QcrA_N | QcrA subunit N-terminal region | I7GD61 |
| PF21630 | Q4D059-like | Hypothetical protein Q4D059-like | |
| PF22220 | QSOX_pErv | Quiescin sulphydryl oxidase pseudo-Erv domain | |