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{{enzyme
| Name = homospermidine synthase (spermidine-specific)
| EC_number = 2.5.1.45
| CAS_number =
| IUBMB_EC_number = 2/5/1/45
| GO_code = 0050514
| image =
| width =
| caption =
}}
In [[enzymology]], a '''homospermidine synthase (spermidine-specific)''' ({{EC number|2.5.1.45}}) is an [[enzyme]] that [[catalysis|catalyzes]] the [[chemical reaction]]

:spermidine + putrescine <math>\rightleftharpoons</math> sym-homospermidine + propane-1,3-diamine

Thus, the two [[substrate (biochemistry)|substrates]] of this enzyme are [[spermidine]] and [[putrescine]], whereas its two [[product (chemistry)|products]] are [[sym-homospermidine]] and [[propane-1,3-diamine]].

This enzyme belongs to the family of [[transferase]]s, specifically those transferring aryl or alkyl groups other than methyl groups. The systematic name of this enzyme class is '''spermidine:putrescine 4-aminobutyltransferase (propane-1,3-diamine-forming)'''.

==References==
{{reflist|1}}
* {{cite journal | author = Ostrovsky AN, Grischenko AV, Taylor PD, Bock P, Mawatari SF | date = 2006 | title = Comparative anatomical study of internal brooding in three anascan bryozoans (Cheilostomata) and its taxonomic and evolutionary implications | journal = J. Morphol. | volume = 267 | pages = 739–49 | pmid = 16526057 | doi = 10.1002/jmor.10438 | issue = 6 }}
* {{cite journal | author = Ober D, Hartmann T | date = 1999 | title = Homospermidine synthase, the first pathway-specific enzyme of pyrrolizidine alkaloid biosynthesis, evolved from deoxyhypusine synthase | journal = Proc. Natl. Acad. Sci. U.S.A. | volume = 96 | pages = 14777–82 | pmid = 10611289 | doi = 10.1073/pnas.96.26.14777 | issue = 26 | pmc = 24724 }}
* {{cite journal | author = Ober D, Harms R and Hartmann T | date = 2000 | title = Cloning and expression of homospermidine synthase from Senecio vulgaris: a revision | journal = [[Phytochemistry (journal)|Phytochemistry]] | volume = 55 | pages = 311–316 | pmid=11117877 | doi=10.1016/S0031-9422(00)00267-3 | issue = 4}}

[[Category:EC 2.5.1]]
[[Category:Enzymes of unknown structure]]

{{transferase-stub}}

Chlorophyll synthase - Revision history

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