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Enzyme Nomenclature
Information on EC 2.1.1.235 - dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose N,N-dimethyltransferase
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The expected taxonomic range for this enzyme is: Streptomyces fradiae
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EC NUMBER 
COMMENTARY 
2.1.1.235
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RECOMMENDED NAME
GeneOntology No.
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose N,N-dimethyltransferase
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT
LITERATURE
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose = 2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
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PATHWAY
BRENDA Link
KEGG Link
MetaCyc Link
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SYSTEMATIC NAME
IUBMB Comments
S-adenosyl-L-methionine:dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose 3-N,N-dimethyltransferase
The enzyme is involved in the biosynthesis of mycaminose, an essential structural component of the macrolide antibiotic tylosin, which is produced by the bacterium Streptomyces fradiae.
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ORGANISM
COMMENTARY
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
physiological function
additional information
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structure model of TylM1 with bound S-adenosyl-L-methionine and dTDP-phenol: Model of the Michaelis complex in stereo. The C-3' amino group is positioned to attack the methyl group of S-adenoyl-L-methionine. dTDP-mycaminose binding pocket structure, overview
physiological function
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the enzyme catalyzes the N,N-dimethylation step in the biosynthesis of mycaminose. Mycaminose is an aminohexose found in several macrolide antibiotics. The sugar contains a C-3 N,N-dimethylamino group which confers the biological activity of these unusual sugar
physiological function
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the enzyme is involved in biosynthesis of D-mycaminose. It is synthesized by the Gram-positive bacterium Streptomyces fradiae as a dTDP-linked sugar
physiological function
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enzyme TylM1 is a dimethyltransferase from Streptomyces fradiae involved in the production of dTDP-mycaminose
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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
2 S-adenosyl-L-methionine + dTDP-3-amino-3,4,6-trideoxy-alpha-xylo-hexopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,4,6-trideoxy-alpha-xylo-hexopyranose
kcat/KM is about 3fold lower than kcat/Km for the natural substrated TDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
i.e. TDP-alpha-D-desosamine
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?
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
S-adenosyl-L-methionine + dTDP-3-methylamino-3,6-dideoxy-alpha-D-glucopyranose
S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
chemically prepared monomethylated compound is a substrate for TylM1 and could be swiftly converted by TylM1 to the dimethylated product. TylM1 catalyzes an N,N-dimethylation reaction by way of a monomethylated intermediate. Since the monomethylated amino group is intrinsically a better nucleophile than the unsubstituted amino group, the reaction rate of this SN2-type methyl transfer reaction is expected to be higher for the second half reaction than for the first methylation reaction
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?
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
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?
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
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the enzyme is involved in biosynthesis of D-mycaminose. It is synthesized by the Gram-positive bacterium Streptomyces fradiae as a dTDP-linked sugar
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?
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
the enzyme is involved in the biosynthesis of mycaminose, an essential structural component of the macrolide antibiotic tylosin poduced by Streptomyces fradiae
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-
?
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
TylM1 has relaxed specificity toward its sugar substrate. The kcat/KM for dTDP-3-amino-4,6-dideoxy-alpha-D-glucopyranose is about 3fold lower than kcat/Km for the natural substrated TDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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?
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
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i.e dTDP-mycaminose, binding pocket structure and binding mechanism, overview
analysis of the binding structure of the dTDP-sugar in enzyme TylM1 active site, overview. Only a water molecule is expelled from the active site to accommodate one of the methyl substituents on the C-3' amino group
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additional information
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the enzyme also catalyzes the methylation of dTDP-3-amino-3,6-dideoxy-alpha-D-galactopyranose, EC 2.1.1.236
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NATURAL SUBSTRATES
NATURAL PRODUCTS
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
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
additional information
?
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the enzyme also catalyzes the methylation of dTDP-3-amino-3,6-dideoxy-alpha-D-galactopyranose, EC 2.1.1.236
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2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
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?
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
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the enzyme is involved in biosynthesis of D-mycaminose. It is synthesized by the Gram-positive bacterium Streptomyces fradiae as a dTDP-linked sugar
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-
?
2 S-adenosyl-L-methionine + dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
2 S-adenosyl-L-homocysteine + dTDP-3-dimethylamino-3,6-dideoxy-alpha-D-glucopyranose
P95748
the enzyme is involved in the biosynthesis of mycaminose, an essential structural component of the macrolide antibiotic tylosin poduced by Streptomyces fradiae
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COFACTOR
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
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METALS and IONS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
additional information
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TylM1 is not a Mg2+-dependent methyltransferase
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KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.0468
dTDP-3-methylamino-3,6-dideoxy-alpha-D-glucopyranose
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pH 7.5, 24°C
0.045
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH 8.5, 37°C, wild-type enzyme
0.079
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH and temperature not specified in the publication
0.67
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH 8.5, 37°C, mutant enzyme H123A
0.93
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH 8.5, 37°C, mutant enzyme H123N
0.0989
S-adenosyl-L-methionine
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pH 7.5, 24°C, cosubstrate: 1.28 mM dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
0.117
S-adenosyl-L-methionine
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pH 7.5, 24°C, cosubstrate: dTDP-3-methylamino-3,6-dideoxy-alpha-D-glucopyranose
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TURNOVER NUMBER [1/s]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.54
dTDP-3-methylamino-3,6-dideoxy-alpha-D-glucopyranose
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pH 7.5, 24°C
0.0126
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH 8.5, 37°C, mutant enzyme H123N
0.046
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH 8.5, 37°C, mutant enzyme H123A
0.172
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH 8.5, 37°C, wild-type enzyme
0.75
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH and temperature not specified in the publication
0.09
S-adenosyl-L-methionine
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pH 7.5, 24°C, cosubstrate: 1.28 mM dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
0.86
S-adenosyl-L-methionine
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pH 7.5, 24°C, cosubstrate: 0.89 mM dTDP-3-methylamino-3,6-dideoxy-alpha-D-glucopyranose
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kcat/KM VALUE [1/mMs-1]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
11.5
dTDP-3-methylamino-3,6-dideoxy-alpha-D-glucopyranose
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pH 7.5, 24°C
0.0135
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH 8.5, 37°C, mutant enzyme H123N
0.069
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH 8.5, 37°C, mutant enzyme H123A
3.8
dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
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pH 8.5, 37°C, wild-type enzyme
0.91
S-adenosyl-L-methionine
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pH 7.5, 24°C, cosubstrate: 1.28 mM dTDP-3-amino-3,6-dideoxy-alpha-D-glucopyranose
7.35
S-adenosyl-L-methionine
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pH 7.5, 24°C, cosubstrate: dTDP-3-methylamino-3,6-dideoxy-alpha-D-glucopyranose
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pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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TEMPERATURE OPTIMUM
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
enzyme in complex with S-adenosyl-L-homocysteine and dTDP-3-N-methylamino-3,6-dideoxyglucose., X-ray diffraction structure determination and analysis at 1.6 A resolution
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hanging drop method of vapor diffusion method, high resolution X-ray structures of TylM1, one in which the enzyme contains bound SAM and dTDP-phenol and the second in which the protein is complexed with S-adenosyl-L-homocysteine and dTDP-3-amino-3,6-dideoxyglucose, its natural substrate. Combined, these two structures, solved to 1.35 A and 1.79 A resolution, respectively, show the orientations of SAM and the dTDP-linked sugar substrate within the active site region. Specifically, the C-30 amino group of the hexose is in the correct position for an in-line attack at the reactive methyl group of S-adenosyl-L-methionine. High-resolution X-ray models show that the observed perturbations in the kinetic constants of the mutant enzynes H123A and H123N are not due to major changes in their threedimensional folds. Most likely the proton on the C-3' amino group is transferred to one of the water molecules lining the active site pocket as catalysis proceeds
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GENERAL STABILITY
ORGANISM
UNIPROT
LITERATURE
concentrated TylM1 protein is stable and can endure repeated freeze/thaw cycles without losing noticeable activity
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inclusion of 0.1 mM S-adenosyl-L-methioninet in buffers is crucial to prevent TylM1 from precipitating during the purification
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TylM1 is unstable at low concentrations, requiring the addition of bovine serum albumin (1 mg/mL) to the assay buffer during kinetic studies of the
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STORAGE STABILITY
ORGANISM
UNIPROT
LITERATURE
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Purification/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
inclusion of 0.1 mM AdoMet in buffers is crucial to prevent TylM1 from precipitating during the purification
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Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
expression in Escherichia coli. Heterologous expression of the tylM1 gene in the desVI deletion mutant of Streptomyces venezuelae. TylM1 is a competent substitute for DesVI
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ENGINEERING
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
H123A
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mutant protein retains catalytic activity, the kcat/Km is reduced to 1.8% compared to the wild-type enzyme
H123N
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mutant protein retains catalytic activity, the kcat/Km is reduced to 0.37% compared to the wild-type enzyme
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APPLICATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
medicine
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the enzyme is involved in biosynthesis of D-mycaminose. D-Mycaminose is an unusual dideoxy sugar found attached to the antibiotic tylosin, a commonly used veterinarian therapeutic
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LINKS TO OTHER DATABASES (specific for EC-Number 2.1.1.235)
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