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2.5.1.44: homospermidine synthase

This is an abbreviated version!
For detailed information about homospermidine synthase, go to the full flat file.

Word Map on EC 2.5.1.44

Reaction

2 putrescine =

sym-homospermidine
+
NH3
+
H+

Synonyms

Atu3768, BvHSS, homospermidine synthase orthologue, HSPD synthase, HSS, HSS orthologue, synthase, homospermidine

ECTree

     2 Transferases
         2.5 Transferring alkyl or aryl groups, other than methyl groups
             2.5.1 Transferring alkyl or aryl groups, other than methyl groups (only sub-subclass identified to date)
                2.5.1.44 homospermidine synthase

Cofactor

Cofactor on EC 2.5.1.44 - homospermidine synthase

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COFACTOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
NADH
unique usage of NAD(H) as a prosthetic group. the cofactor is coordinated through hydrogen bonding via residues Ser21, Ile22, Ser230 (phosphate), Asp45, Val66 (adenosine), Ser92,Thr114, Ala161, Asn162, and Pro163 (nicotineamide riboside). The phosphate-binding motif (18GFGSIG23) is located in the loop connecting beta-strand 2 and alpha-helix A of the Rossmann fold. The adenosine part of NAD+ is bound via loop regions located between beta-strand 4, 5, 6 and alpha-helix C, D, E. Nicotineamide-riboside-binding residues are found in loop regions between beta-strand 7 and 8 and alpha-helix F and O
NADP+
-
68% of the activity with NAD+