EC Number |
Substrates |
Organism |
Products |
Reversibility |
---|
2.5.1.44 | 2 putrescine |
as partially purified enzymes have been used in the assay the dependence on spermidine for the homospermidine synthesis may have been overlooked. If these enzymes should proof to be spermidine-dependent like other enzymes from plant sources, they must be classified as EC 2.5.1.45 |
Santalum album |
sym-homospermidine + NH3 |
- |
? |
2.5.1.44 | 2 putrescine |
one molecule of putrescine is oxidized by NAD+ to form enzyme-bound 4-aminobutyraldehyde. This intermediate reacts with a second molecule of putrescine to form a Schiff base which is reduced by NADH (formed from NAD+ in the first part of the reaction) to give homospermidine |
Blastochloris viridis |
sym-homospermidine + NH3 |
- |
? |
2.5.1.44 | 2 putrescine |
the enzyme is involved in polyamine biosynthesis pathway |
Agrobacterium fabrum |
sym-homospermidine + NH3 |
- |
? |
2.5.1.44 | 2 putrescine |
- |
Agrobacterium fabrum C58 |
sym-homospermidine + NH3 |
- |
? |
2.5.1.44 | 2 putrescine |
the enzyme is involved in polyamine biosynthesis pathway |
Agrobacterium fabrum C58 |
sym-homospermidine + NH3 |
- |
? |
2.5.1.44 | 2 putrescine |
one molecule of putrescine is oxidized by NAD+ to form enzyme-bound 4-aminobutyraldehyde. This intermediate reacts with a second molecule of putrescine to form a Schiff base which is reduced by NADH (formed from NAD+ in the first part of the reaction) to give homospermidine |
Blastochloris viridis N.C.I.B. 10028 |
sym-homospermidine + NH3 |
- |
? |
2.5.1.44 | 2 spermidine |
- |
Blastochloris viridis |
sym-homospermidine + propane-1,3-diamine + putrescine |
- |
? |
2.5.1.44 | more |
despite the synthesis of homospermidine, the enzyme also produces 4-aminobutilcadaverine |
Rhizobium tropici |
? |
- |
? |
2.5.1.44 | more |
the enzyme has two distinct substrate binding sites, one of which is highly specific for putrescine. Enzyme HSS features a side pocket in the direct vicinity of the active site formed by conserved amino acids and a potential substrate discrimination, guiding, and sensing mechanism. The enzyme is capable of catalyzing side reactions to produce a variety of N-aminobutyl-linked triamines utilizing putrescine together with respective linear diamines with C3 to C7 carbon chains, overview. Bacterial HSS does not produce sym-norspermidine from two 1,4-diaminopropanes |
Blastochloris viridis |
? |
- |
? |
2.5.1.44 | more |
despite the synthesis of homospermidine, the enzyme also produces 4-aminobutilcadaverine |
Rhizobium tropici Rt CIAT899 |
? |
- |
? |