5.2.1.14: beta-carotene isomerase
This is an abbreviated version!
For detailed information about beta-carotene isomerase, go to the full flat file.
Word Map on EC 5.2.1.14
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5.2.1.14
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strigolactones
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sls
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carotenoid
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dioxygenases
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shoot
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axillary
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outgrowth
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carlactone
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symbiotic
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sativa
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tiller
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lactones
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terpenoid
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arbuscular
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abscisic
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carotenoid-derived
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truncatula
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mycorrhizal
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enol
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medicago
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nsp1
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dwarf14
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agronomic
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hyphal
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iron-containing
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butenolide
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primordia
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panicle
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growth1
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sl-dependent
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orobanchol
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weed
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d-ring
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carotenogenesis
- 5.2.1.14
- strigolactones
- sls
-
carotenoid
- dioxygenases
- shoot
-
axillary
-
outgrowth
- carlactone
-
symbiotic
- sativa
-
tiller
- lactones
-
terpenoid
-
arbuscular
-
abscisic
-
carotenoid-derived
- truncatula
-
mycorrhizal
-
enol
-
medicago
- nsp1
-
dwarf14
-
agronomic
-
hyphal
-
iron-containing
-
butenolide
-
primordia
-
panicle
-
growth1
-
sl-dependent
-
orobanchol
-
weed
-
d-ring
-
carotenogenesis
Reaction
Synonyms
all-trans-/9-cis-beta-carotene isomerase, beta-carotene cis–trans isomerase, beta-carotene isomerase, D27, D27 protein, DWARF27, OsD27
ECTree
5.2.1.14 beta-carotene isomeraseAdvanced search results
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results (Substrates Products
Substrates Products on EC 5.2.1.14 - beta-carotene isomerase
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SUBSTRATE 
PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate)
(Substrate)
LITERATURE
(Substrate)
(Substrate)
COMMENTARY
(Product)
(Product)
LITERATURE
(Product)
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
r=reversible
ir=irreversible
?=not specified
alpha-carotene
9-cis-alpha-carotene + 9'-cis-alpha-carotene
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?
9-cis-beta-carotene
all-trans-beta-carotene
reaction is reversible, the conversion of 9-cis- into all-trans-beta-carotene is the preferred reaction
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r
all-trans-beta,beta-cryptoxanthin
9-cis-beta,beta-cryptoxanthin
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low activity
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?
all-trans-beta,beta-cryptoxanthin
9-cis-beta,beta-cryptoxanthin
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r
additional information
?
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the enzyme does not isomerize 13-cis-beta-carotene, 15-cis-beta-carotene, all-trans-violaxanthin, all-trans-neoxanthin, all-trans-lutein, 9-cis-beta-apo-10'-carotenal, 9-cis-3-hydroxy-beta-apo-10'-carotenal, 9-cis-alpha-apo-10'-carotenal, and 9-cis-3-hydroxy-alpha-apo-10'-carotenal
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additional information
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catalytic mechanism involves a 1-electron transfer from the polyene pi-system of beta-carotene to a [2Fe-2S] cluster, generating a radical cation, which is able to rotate about the C-C single bond. Electron transfer back from the reduced [2Fe-2S] cluster would then generate the 9-cis-beta-carotene product. A mechanism involving single electron transfer from a [2Fe-2S] cluster to form a radical anion intermediate is also possible
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?
additional information
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the enzyme is strictly double bond-specific, solely targeting the C9-C10 double bond. DWARF27 does not introduce a 9-cis-double bond in 13-cis- or 15-cis-beta-carotene. Substrates are bicyclic carotenoids, including beta-, alpha-carotene and beta,beta-cryptoxanthin, that contain at least one unsubstituted beta-ionone ring
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