| 2-keto-3-deoxygluconokinase | Thermus thermophilus (strain HB27 / ATCC BAA-163 / DSM 7039) | Not Available | 1 | Details |
| 2-methylcitrate synthase | Antarctic bacterium DS2-3R | Involved in the catabolism of short chain fatty acids (SCFA) via the tricarboxylic acid (TCA)(acetyl degradation rout... more | 2 | Details |
| 2-methylisocitrate lyase | Escherichia coli (strain K12) | Involved in the catabolism of short chain fatty acids (SCFA) via the 2-methylcitrate cycle I (propionate degradation ... more | 1 | Details |
| 2-oxo-1,2-dihydroquinoline 8-monooxygenase, oxygenase component | Pseudomonas putida | Not Available | 1 | Details |
| 2-oxo-tetronate isomerase | Escherichia coli (strain K12) | Catalyzes the isomerization of 2-oxo-tetronate to 3-oxo-tetronate. | 1 | Details |
| 2-oxoglutarate and iron-dependent oxygenase domain-containing protein 2 | Humans | Not Available | 1 | Details |
| 2-oxoglutarate dehydrogenase complex component E1 | Humans | 2-oxoglutarate dehydrogenase (E1o) component of the 2-oxoglutarate dehydrogenase complex (OGDHC). Participates in the... more | 6 | Details |
| 2-oxopropyl-CoM reductase, carboxylating | Xanthobacter autotrophicus (strain ATCC BAA-1158 / Py2) | Involved in aliphatic epoxide carboxylation. Catalyzes the reductive cleavage of the thioether bond of 2-oxopropyl-co... more | 2 | Details |
| 20-ketosteroid reductase (20-hydroxysteroid dehydrogenase) | Humans and other mammals | Aldo-keto reductase 1C1 to 1C4 all have some degree of 20-ketosteroid reductase activity. AKR1C1 has the most activity. | 2 | Details |
| 23S ribosomal RNA | Enteric bacteria and other eubacteria | In prokaryotes, the 23S rRNA is part of the large subunit (the 50S) that joins with the 30S small subunit to create t... more | 20 | Details |
| 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial | Humans | A cytochrome P450 monooxygenase involved in vitamin D metabolism and in calcium and phosphorus homeostasis. Catalyzes... more | 6 | Details |
| 26S proteasome regulatory subunit 6A | Humans | Component of the 26S proteasome, a multiprotein complex involved in the ATP-dependent degradation of ubiquitinated pr... more | 1 | Details |
| 3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type 1 | Humans | A bifunctional enzyme responsible for the oxidation and isomerization of 3beta-hydroxy-Delta(5)-steroid precursors to... more | 15 | Details |
| 3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type 2 | Humans | 3-beta-HSD is a bifunctional enzyme, that catalyzes the oxidative conversion of Delta(5)-ene-3-beta-hydroxy steroid, ... more | 8 | Details |
| 3',5'-cyclic-AMP phosphodiesterase 4A | Humans | Hydrolyzes the second messenger 3',5'-cyclic AMP (cAMP), which is a key regulator of many important physiological pro... more | 36 | Details |
| 3',5'-cyclic-AMP phosphodiesterase 4B | Humans | Hydrolyzes the second messenger cAMP, which is a key regulator of many important physiological processes. May be invo... more | 40 | Details |
| 3',5'-cyclic-AMP phosphodiesterase 4C | Humans | Hydrolyzes the second messenger cAMP, which is a key regulator of many important physiological processes | 6 | Details |
| 3',5'-cyclic-AMP phosphodiesterase 4D | Humans | Hydrolyzes the second messenger cAMP, which is a key regulator of many important physiological processes | 41 | Details |
| 3',5'-cyclic-nucleotide phosphodiesterase | Rabbit | Not Available | 4 | Details |
| 3,4-dihydroxyphenylacetate 2,3-dioxygenase | Arthrobacter globiformis | Not Available | 1 | Details |
| 3-alpha-(or 20-beta)-hydroxysteroid dehydrogenase | Streptomyces exfoliatus | Not Available | 1 | Details |
| 3-alpha-(or 20-beta)-hydroxysteroid dehydrogenase | Mycobacterium tuberculosis | Probably involved in steroid metabolism. Catalyzes the oxidation of androsterone (3alpha-hydroxy-5alpha-androstan-17-... more | 1 | Details |
| 3-beta-hydroxysteroid-Delta(8),Delta(7)-isomerase | Humans | Isomerase that catalyzes the conversion of Delta(8)-sterols to their corresponding Delta(7)-isomers a catalytic step ... more | 3 | Details |
| 3-carboxy-cis,cis-muconate cycloisomerase | Pseudomonas putida | Catalyzes an anti cycloisomerization. | 2 | Details |
| 3-dehydroquinate dehydratase | Staphylococcus aureus (strain MRSA252) | Involved in the third step of the chorismate pathway, which leads to the biosynthesis of aromatic amino acids. Cataly... more | 1 | Details |