| Gene Name | ORF Name | Function GO Term | Process GO Term | Component GO Term | Interacting Genes | Description | Gene Product | Phenotype |
| SPC2 | YML055W | protein binding | signal peptide processing | signal peptidase complex | YBR217W YOL016C YER022W YLR078C | subunit of signal peptidase complex, homologous to mammalian protein SPC25 | signal peptidase complex subunit|similar to mammalian protein SPC25 | Null mutant is viable. spc1 spc2 double deletion mutants grow relatively well as compared to wild-ty |
| SPC3 | YLR066W | signal peptidase activity | signal peptide processing | signal peptidase complex | YJR091C | signal peptidase subunit | | Null mutant is inviable. |
| SPT14 | YPL175W | transferase activity, transferring hexosyl groups | GPI anchor biosynthesis | endoplasmic reticulum | YDR215C | N-acetylglucosaminyl-phosphatidylinositol biosynthetic protein | N-acetylglucosaminyl-phosphatidylinositol biosynthetic protein | suppression of Ty transcription |
| SRP14 | YDL092W | signal sequence binding | protein-ER targeting | signal recognition particle | YPR088C YKL122C | Signal recognition particle subunit | | Null mutant is viable |
| SRP54 | YPR088C | signal sequence binding | protein-ER targeting | signal recognition particle | YCL037C YOR128C YER155C YDL051W YDL092W YML105C YKL122C YPL243W YPL210C YOR272W YKR036C YMR106C | Signal recognition particle subunit (homolog of mammalian SRP54) | | Amaya et al. (J. Biochem. (Tokyo) 107:457-463) report that a SRP54 deletion is inviable, whereas Han |
| SRP68 | YPL243W | signal sequence binding | protein-ER targeting | signal recognition particle | YPR088C | part of the signal recognition particle (SRP) ribonucleoprotein (RNP) complex that functions in prot | signal recognition particle component | Null mutant is viable, associated with slow cell growth and inefficient protein translocation across |
| SRP72 | YPL210C | signal sequence binding | protein-ER targeting | signal recognition particle | YPR088C | part of the signal recognition particle (SRP) ribonucleoprotein (RNP) complex that functions in prot | signal recognition particle component | Null mutant is viable, associated with slow cell growth and inefficient protein translocation across |
| SSS1 | YDR086C | protein transporter activity | cotranslational membrane targeting | translocon | YLR378C YBL022C | Subunit of the Sec61p ER translocation complex (Sec61p-Sss1p-Sbh1p), involved in transfer of secreto | ER protein|Sec61 trimeric complex component|Ssh1 trimeric complex component | Null mutant is inviable. Depletion of the Sss1 protein rapidly results in accumulation of multiple s |
| SUR2 | YDR297W | sphingosine hydroxylase activity | sphingolipid biosynthesis* | endoplasmic reticulum | YCR009C YBR036C | Possibly hydroxylates ceramide-1 at C-4 to give ceramide-2. Or, hydroxylates DHS at C-4 to give PHS, | sphingosine hydroxylase | Null mutant has altered phospholipid levels; suppressor of rvs161 and rvs167 mutations. |
| SUR4 | YLR372W | fatty acid elongase activity | sphingolipid biosynthesis* | endoplasmic reticulum* | YPL076W YCR034W YCR009C YPL031C | Elongase III synthesizes 20-26-carbon fatty acids from C18-CoA primers | elongase | Null mutants is viable, not sensitive to UV or gamma radiation. sur4 mutants suppress rad3, rvs161 d |
| TIP20 | YGL145W | molecular_function unknown | retrograde (Golgi to ER) transport | endoplasmic reticulum | YDR498C YOR075W YNL258C YLR373C YPR086W YLR268W YPR105C | transport protein that interacts with Sec20p; required for protein transport from the endoplasmic re | transport protein that interacts with Sec20p; required for protein transport from the endoplasmic re | |
| UFD1 | YGR048W | protein binding | ubiquitin-dependent protein catabolism* | endoplasmic reticulum | YHR039C-A YBR170C YDL126C YKR002W YDR390C YPL222W | Ubiquitin fusion degradation protein | | Homozygous ufd1-1 mutant diploids exhibit sporulation defects. loss of Ufd1 blocks ER-associated pro |
| USE1 | YGL098W | SNAP receptor activity | retrograde (Golgi to ER) transport | endoplasmic reticulum | YEL017W YDR373W | Use1p is a SNARE and forms a complex with the SNAREs Sec22p, Sec20p and Ufe1p. The protein is locali | | |
| VMA21 | YGR105W | molecular_function unknown | protein complex assembly | endoplasmic reticulum* | YFR018C YKL190W YLR039C YLR262C YPR159W YBR164C YAL013W YDR126W | Protein involved in vacuolar H-ATPase assembly or function. Required for the biogenesis of a functio | | Null mutant is viable but grows slowly and exhibits increased calcium sensitivity. Null mutants also |
| WBP1 | YEL002C | dolichyl-diphosphooligosaccharide-protein glycosyltransferase activity | N-linked glycosylation* | endoplasmic reticulum* | YPL227C YGL022W YMR149W YJL002C YML115C YBL082C | wheat germ agglutinin-binding protein | oligosaccharyl transferase glycoprotein complex, beta subunit | lethal |
| YDC1 | YPL087W | ceramidase activity | response to heat* | endoplasmic reticulum | | Yeast dihydro-ceramidase | alkaline dihydroceramidase with minor reverse activity | Null mutant is viable. |
| YEA4 | YEL004W | UDP-N-acetylglucosamine transporter activity | cell wall chitin biosynthesis* | endoplasmic reticulum | | Shows sequence similarity to GOG5, a gene involved in vanadate resistance | | |
| YOS9 | YDR057W | protein transporter activity | ER to Golgi transport | endoplasmic reticulum | | Appears to play a direct role in the transport of GPI-anchored proteins to the Golgi apparatus. | membrane-associated glycoprotein | Accelerates Gas1 transport and processing in cells overexpressing YOS9. Gas1 processing is slowed in |
| YPC1 | YBR183W | ceramidase activity | ceramide metabolism | endoplasmic reticulum | | Yeast Phyto-ceramidase | alkaline ceramidase with reverse activity | Null mutant is viable and two times more heat resistant than the wild-type parental strain. |
| YSR3 | YKR053C | sphingosine-1-phosphate phosphatase activity | sphingolipid biosynthesis | endoplasmic reticulum | YDR403W | Yeast Sphingolipid Resistance Gene | DHS-1-P phosphatase | Null mutant is viable and accumulates of dihydrosphingosine-1-P |
| YBR096W | molecular_function unknown | biological_process unknown | endoplasmic reticulum | | Hypothetical ORF | | |
| YBR159W | ketoreductase activity | fatty acid elongation | endoplasmic reticulum* | | microsomal beta-keto-reductase | | |
| YBR273C | molecular_function unknown | biological_process unknown | endoplasmic reticulum | | Hypothetical ORF | | |
| YBR287W | molecular_function unknown | biological_process unknown | endoplasmic reticulum | | | | |
| YCL045C | molecular_function unknown | biological_process unknown | endoplasmic reticulum | | Hypothetical ORF | | |
| YDL072C | molecular_function unknown | biological_process unknown | endoplasmic reticulum | | Hypothetical ORF | | |
| YDL121C | molecular_function unknown | biological_process unknown | endoplasmic reticulum | | Hypothetical ORF | | |
| YDL193W | prenyltransferase activity | biological_process unknown | endoplasmic reticulum* | | Protein required for cell viability | | |
| YDR056C | molecular_function unknown | biological_process unknown | endoplasmic reticulum* | | Hypothetical ORF | | |
| YDR196C | dephospho-CoA kinase activity | coenzyme A biosynthesis | endoplasmic reticulum* | | predicted to catalyze the final step in synthesis of Coenzyme A | | |