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Enzyme Nomenclature
Information on EC 1.3.1.104 - enoyl-[acyl-carrier-protein] reductase (NADPH)
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The enzyme appears in viruses and cellular organisms
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EC NUMBER 
COMMENTARY 
1.3.1.104
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RECOMMENDED NAME
GeneOntology No.
enoyl-[acyl-carrier-protein] reductase (NADPH)
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT
LITERATURE
an acyl-[acyl-carrier protein] + NADP+ = a trans-2,3-dehydroacyl-[acyl-carrier protein] + NADPH + H+
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PATHWAY
BRENDA Link
KEGG Link
MetaCyc Link
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SYSTEMATIC NAME
IUBMB Comments
acyl-[acyl-carrier protein]:NADP+ oxidoreductase
The enzyme completes each cycle of fatty acid elongation by catalysing the stereospecific reduction of the double bond at position 2 of a growing fatty acid chain, while linked to the acyl-carrier protein, in an NADPH-dependent manner. This entry stands for enzymes whose stereo-specificity with respect to NADP+ is not known. [cf. EC 1.3.1.39 enoyl-[acyl-carrier-protein] reductase (NADPH, Re-specific), EC 1.3.1.10, enoyl-[acyl-carrier-protein] reductase (NADPH, Si-specific) and EC 1.3.1.9, enoyl-[acyl-carrier-protein] reductase (NADH)].
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ORGANISM
COMMENTARY
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
physiological function
physiological function
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expression complements the Escherichia coli fabI temperature-sensitive mutant
physiological function
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expression of isoform FabL complements the temperature-sensitive fabI defect in Escherichia coli and confers complete triclosan resistance. Knockouts of the FabL gene in Bacillus subtilis are viable, but double knockouts of isoforms FabI and FabL are not obtained. The ygaA knockout is 250fold more sensitive to triclosan than wild-type
physiological function
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expression of isoform FabL complements the temperature-sensitive fabI defect in Escherichia coli and confers complete triclosan resistance. Knockouts of the FabL gene in Bacillus subtilis are viable, but double knockouts of isoforms FabI and FabL are not obtained. The ygaA knockout is 250fold more sensitive to triclosan than wild-type
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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
crotonyl-N-acetylcysteamine + NADPH + H+
butyryl-N-acetylcysteamine + NADP+
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-
-
?
gama-chloro-beta-methylcrotonyl-[acyl-carrier-protein] + NADPH + H+
gama-chloro-beta-methylbutanoyl-[acyl-carrier-protein] + NADP+
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-
-
?
crotonyl-[acyl-carrier-protein] + NADPH + H+
butyryl-[acyl-carrier-protein] + NADP+
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-
-
-
?
crotonyl-[acyl-carrier-protein] + NADPH + H+
butyryl-[acyl-carrier-protein] + NADP+
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-
-
?
crotonyl-[acyl-carrier-protein] + NADPH + H+
butyryl-[acyl-carrier-protein] + NADP+
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-
-
?
crotonyl-[acyl-carrier-protein] + NADPH + H+
butyryl-[acyl-carrier-protein] + NADP+
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-
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?
trans-2-octenoyl-N-acetylcysteamine + NADPH + H+
octanoyl-N-acetylcysteamine + NADP+
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?
trans-2-octenoyl-N-acetylcysteamine + NADPH + H+
octanoyl-N-acetylcysteamine + NADP+
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-
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?
trans-2-octenoyl-N-acetylcysteamine + NADPH + H+
octanoyl-N-acetylcysteamine + NADP+
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?
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COFACTOR
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
NADPH
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exhibits specific and positive cooperative binding of NADPH. The cofactor concentration that yields 50% of the maximal rate is 65 microM
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INHIBITORS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
AFN-1252
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antibiotic AFN-1252, i.e. (2E)-N-methyl-N-[(3-methyl-1-benzofuran-2-yl)methyl]-3-(7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)prop-2-enamide, only binds to the NADPH form of FabI
triclosan
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enzyme is reversibly inhibited by triclosan, but does not form a stable ternary complex
triclosan
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the introduction of a plasmid expressing the enzyme gene leads to triclosan resistance
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KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
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Ki VALUE [mM]
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
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IC50 VALUE [mM]
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
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SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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PDB
SCOP
CATH
ORGANISM
UNIPROT
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MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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SUBUNITS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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Crystallization/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
both free form and complexed with NADP+ and inhibitor triclosan, to 2.2 and 1.8 A resolution, respectively. The substrate-binding region in the apo-FabL structure is found in the open form. In addition, the beta4-alpha5 and beta5-alpha7 regions, which include the catalytic residues as well as the cofactor binding residues, get collapsed into the pocket. These differences result in a tetrameric arrangement totally different from NADH-dependent isoform FabI
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to 2.5 A resolution. Hexagonal space group P622, with unit-cell parameters a = b = 139.56, c = 62.75 A , alpha = beta = 90, gamma = 120°
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TEMPERATURE STABILITY
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
58.8
wild-type, melting temperature in presence of both triclosan and NADP+. Neither triclosan nor NADP+ alone increases the Tm value
60.2
mutant M99T, melting temperature in presence of both triclosan and NADP+
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Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
expression in Escherichia coli
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ENGINEERING
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
A95V
about 15% of wild-type activtiy, no inhibition by triclosan and no shift in melting temperature in presence of both triclosan and NADP+
F204S
no shift in melting temperature in presence of both triclosan and NADP+
G23S
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mutation increases the resistance of Staphylococcus aureus to triclosan by an order of magnitude
I193S
no shift in melting temperature in presence of both triclosan and NADP+
M99T
Y147H
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mutant is resistant to antibiotic AFN-1252 and to triclosan, about 5% of wild-type catalytic activity. A strain expressing Y147H has a pronounced growth defect that is rescued by exogenous fatty acid supplementation
A95V
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about 15% of wild-type activtiy, no inhibition by triclosan and no shift in melting temperature in presence of both triclosan and NADP+
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F204S
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no shift in melting temperature in presence of both triclosan and NADP+
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I193S
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no shift in melting temperature in presence of both triclosan and NADP+
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M99T
Y147H
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mutant is resistant to antibiotic AFN-1252 and to triclosan, about 5% of wild-type catalytic activity. A strain expressing Y147H has a pronounced growth defect that is rescued by exogenous fatty acid supplementation
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additional information
replacement of amino acids 55-66 by CurF enoyl reductase cyclopropanase loop leads to gain-of-function activity as a cyclopropanase. With substrate 3-chloromethyl-crotonyl-[acyl-carrier-protein], the formation of both the reduced product and also the cyclopropanated productis detected at levels of about one-quarter of the total product
M99T
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mutant is resistant to antibiotic AFN-1252 but susceptible to triclosan. Strains expressing M99T exhibit normal growth, and the biochemical properties of the purified protein are indistinguishable from those of FabI
M99T
mutant shows a similar shift in melting temperature in presence of both triclosan and NADP+ as wild-type
M99T
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mutant shows a similar shift in melting temperature in presence of both triclosan and NADP+ as wild-type
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M99T
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mutant is resistant to antibiotic AFN-1252 but susceptible to triclosan. Strains expressing M99T exhibit normal growth, and the biochemical properties of the purified protein are indistinguishable from those of FabI
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APPLICATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
analysis
analysis
development of a simple thermal shift assay, which does not use ACP-linked substrates, to determine the binding ability of triclosan to the enzyme's active site
analysis
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development of a simple thermal shift assay, which does not use ACP-linked substrates, to determine the binding ability of triclosan to the enzyme's active site
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LINKS TO OTHER DATABASES (specific for EC-Number 1.3.1.104)
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