| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species | 
| Q9LKA4 | UBP1-associated protein 2C; | UBA2C; At3g15010; | NP_188119.1;NP_974317.1; | 404 | arabidopsis | 
| O80678 | UBP1-associated protein 2B; | UBA2B; At2g41060; | NP_001078035.1;NP_181639.1; | 451 | arabidopsis | 
| O65041 | NEDD8-activating enzyme E1 catalytic subunit; EC 6.3.2.-; RUB-activating enzyme; Ubiquitin-activating enzyme E1-like protein; | ECR1; At5g19180; | NP_568370.1; | 454 | arabidopsis | 
| O23034 | Ubiquitin-like modifier-activating enzyme 5; Ubiquitin-activating enzyme 5; | At1g05350; | NP_172027.2; | 431 | arabidopsis | 
| Q7Y175 | UBA and UBX domain-containing protein At4g15410; | At4g15410; | NP_567463.1; | 421 | arabidopsis | 
| P35133 | Ubiquitin-conjugating enzyme E2 10; EC 6.3.2.19; Ubiquitin carrier protein 10/12; Ubiquitin-conjugating enzyme E2-17 kDa 10/12; Ubiquitin-protein ligase 10/12; | UBC10; UBC12; At5g53300; | NP_001190528.1;NP_568788.1;NP_851181.1; | 148 | arabidopsis | 
| P35134 | Ubiquitin-conjugating enzyme E2 11; EC 6.3.2.19; Ubiquitin carrier protein 11; Ubiquitin-conjugating enzyme E2-17 kDa 11; Ubiquitin-protein ligase 11; | UBC11; At3g08690; | NP_001189841.1;NP_566331.1; | 148 | arabidopsis | 
| Q9C9Y7 | Probable ubiquitin-conjugating enzyme E2 12; EC 6.3.2.19; | UBC12; At3g08700; | NP_566332.1; | 149 | arabidopsis | 
| Q42541 | Ubiquitin-conjugating enzyme E2 13; EC 6.3.2.19; Ubiquitin carrier protein 13; Ubiquitin-protein ligase 13; | UBC13; At3g46460; | NP_566884.1; | 166 | arabidopsis | 
| P42747 | Ubiquitin-conjugating enzyme E2 14; EC 6.3.2.19; TAYO29; UbcAt3; Ubiquitin carrier protein 14; Ubiquitin-protein ligase 14; | UBC14; UBC3 UBC7; At3g55380; | NP_567020.1; | 167 | arabidopsis | 
| P42743 | Ubiquitin-conjugating enzyme 15; EC 6.3.2.19; PM42; Ubiquitin carrier protein; Ubiquitin-conjugating enzyme E2-18 kDa 15; Ubiquitin-protein ligase; | UBC15; UBC2-1; At1g45050; | NP_564493.1; | 161 | arabidopsis | 
| Q9FWT2 | Probable ubiquitin-conjugating enzyme E2 16; EC 6.3.2.19; Ubiquitin carrier protein 16; | UBC16; At1g75440; | NP_565110.1; | 161 | arabidopsis | 
| O23239 | Probable ubiquitin-conjugating enzyme E2 17; EC 6.3.2.19; Ubiquitin carrier protein 17; | UBC17; At4g36410; | NP_568004.1; | 161 | arabidopsis | 
| Q9FMM0 | Probable ubiquitin-conjugating enzyme E2 18; EC 6.3.2.19; Ubiquitin carrier protein 18; | UBC18; At5g42990; | NP_568619.1; | 161 | arabidopsis | 
| Q9LJZ5 | Ubiquitin-conjugating enzyme E2 19; EC 6.3.2.19; Ubiquitin carrier protein 19; | UBC19; At3g20060; | NP_001078192.1;NP_566653.1; | 181 | arabidopsis | 
| P25865 | Ubiquitin-conjugating enzyme E2 1; EC 6.3.2.19; Ubiquitin carrier protein 1; Ubiquitin-conjugating enzyme E2-17 kDa 1; Ubiquitin-protein ligase 1; | UBC1; At1g14400; | NP_563951.1;NP_973825.1; | 152 | arabidopsis | 
| Q8L7T3 | Ubiquitin-conjugating enzyme E2 20; EC 6.3.2.19; Ubiquitin carrier protein 20; | UBC20; At1g50490; | NP_564572.1; | 180 | arabidopsis | 
| Q9FF66 | Ubiquitin-conjugating enzyme E2 22; EC 6.3.2.19; Ubiquitin carrier protein 22; | UBC22; At5g05080; | NP_001078530.1;NP_568148.1; | 251 | arabidopsis | 
| Q9ZVX1 | Probable ubiquitin-conjugating enzyme E2 23; EC 6.3.2.19; Ubiquitin carrier protein 23; | UBC23; At2g16920; | NP_179284.1; | 1102 | arabidopsis | 
| Q8VY10 | Probable ubiquitin-conjugating enzyme E2 24; EC 6.3.2.19; AtPHO2; Ubiquitin carrier protein 24; Ubiquitin-protein ligase 24; | UBC24; PHO2; At2g33770; | NP_850218.1; | 907 | arabidopsis | 
