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EC Tree
IUBMB Comments The enzyme also methylates gibberellins A20 (95%), A3 (80%), A4 (69%) and A34 (46%) with significant activity.
The expected taxonomic range for this enzyme is: Arabidopsis thaliana
Synonyms
GA methyl transferase 1, GAMT1,
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GA methyl transferase 1
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GAMT1
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S-adenosyl-L-methionine + gibberellin A9 = S-adenosyl-L-homocysteine + methyl gibberellin A9
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S-adenosyl-L-methionine:gibberellin A9 O-methyltransferase
The enzyme also methylates gibberellins A20 (95%), A3 (80%), A4 (69%) and A34 (46%) with significant activity.
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S-adenosyl-L-methionine + gibberellin 1
S-adenosyl-L-homocysteine + methyl gibberellin A1
25% of the activity compared to methylation of gibberellin A9
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?
S-adenosyl-L-methionine + gibberellin A19
S-adenosyl-L-homocysteine + methyl gibberellin A19
19% of the activity compared to methylation of gibberellin A9
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?
S-adenosyl-L-methionine + gibberellin A20
S-adenosyl-L-homocysteine + methyl gibberellin A20
95% of the activity compared to methylation of gibberellin A9
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?
S-adenosyl-L-methionine + gibberellin A3
S-adenosyl-L-homocysteine + methyl gibberellin A3
80% of the activity compared to methylation of gibberellin A9
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?
S-adenosyl-L-methionine + gibberellin A34
S-adenosyl-L-homocysteine + methyl gibberellin A34
46% of the activity compared to methylation of gibberellin A9
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S-adenosyl-L-methionine + gibberellin A4
S-adenosyl-L-homocysteine + methyl gibberellin A4
69% of the activity compared to methylation of gibberellin A9
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S-adenosyl-L-methionine + gibberellin A51
S-adenosyl-L-homocysteine + methyl gibberellin A51
32% of the activity compared to methylation of gibberellin A9
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S-adenosyl-L-methionine + gibberellin A9
S-adenosyl-L-homocysteine + methyl gibberellin A9
S-adenosyl-L-methionine + gibberellin A9
S-adenosyl-L-homocysteine + methyl gibberellin A9
methylation of gibberellins by the enzyme serves to deactivate gibberellins and initiate their degradation as the seeds mature
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S-adenosyl-L-methionine + gibberellin A9
S-adenosyl-L-homocysteine + methyl gibberellin A9
gibberellin A9 i.e. (1R,4aR,4bR,7R,9aR,10S,10aR)-1-methyl-8-methylene-13-oxododecahydro-4a,1-(epoxymethano)-7,9a-methanobenzo[a]azulene-10-carboxylic acid
methyl gibberellin A9 i.e. methyl (1R,4aR,4bR,7R,9aR,10S,10aR)-1-methyl-8-methylene-13-oxododecahydro-4a,1-(epoxymethano)-7,9a-methanobenzo[a]azulene-10-carboxylate
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?
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S-adenosyl-L-methionine + gibberellin A9
S-adenosyl-L-homocysteine + methyl gibberellin A9
methylation of gibberellins by the enzyme serves to deactivate gibberellins and initiate their degradation as the seeds mature
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K+
5 mM, 3fold activation
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Cu2+
5 mM, more than 90% inhibition
Fe2+
5 mM, more than 90% inhibition
Fe3+
5 mM, more than 90% inhibition
Zn2+
5 mM, more than 90% inhibition
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NH4+
5 mM, 4fold activation
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Dwarfism
Methylation of gibberellins by Arabidopsis GAMT1 and GAMT2.
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0.0054
gibberellin a4
pH 8.0, 30°C
0.0158
gibberellin a9
pH 8.0, 30°C
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0.01
gibberellin a4
pH 8.0, 30°C
0.026
gibberellin a9
pH 8.0, 30°C
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1.85
gibberellin a4
pH 8.0, 30°C
1.6
gibberellin a9
pH 8.0, 30°C
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SwissProt
brenda
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brenda
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GAMT1 expression is localized mostly to seed
brenda
expressed mainly in whole siliques, peak transcript levels from the middle until the end of silique development
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malfunction
GAMT1 null mutant shows reduced inhibition of germination, compared with the wild type, when placed on plates containing the gibberellin biosynthesis inhibitor ancymidol
physiological function
methylation of gibberellins by the enzyme serves to deactivate gibberellins and initiate their degradation as the seeds mature
physiological function
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tomato plants overexpressing the enzyme exhibit typical gibberellin-deficiency phenotypes and increased tolerance to drought stress. Enzyme overexpression inhibits the expansion of leaf-epidermal cells, leading to the formation of smaller stomata with reduced stomatal pores
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GAMT1_ARATH
376
0
41564
Swiss-Prot
other Location (Reliability: 2 )
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40000
x * 40000, SDS-PAGE
41500
x * 41500, calculated from sequence
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x * 40000, SDS-PAGE
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x * 41500, calculated from sequence
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expressed in Solanum lycopersicum
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expression in Escherichia coli, expression in Arabidopsis under the control of the 35S cauliflower mosaic virus promoter
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expressed mainly in whole siliques, peak transcript levels from the middle until the end of silique development
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Varbanova, M.; Yamaguchi, S.; Yang, Y.; McKelvey, K.; Hanada, A.; Borochov, R.; Yu, F.; Jikumaru, Y.; Ross, J.; Cortes, D.; Ma, C.J.; Noel, J.P.; Mander, L.; Shulaev, V.; Kamiya, Y.; Rodermel, S.; Weiss, D.; Pichersky, E.
Methylation of gibberellins by Arabidopsis GAMT1 and GAMT2
Plant Cell
19
32-45
2007
Arabidopsis thaliana (F4JUY5), Arabidopsis thaliana
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Nir, I.; Moshelion, M.; Weiss, D.
The Arabidopsis gibberellin methyl transferase 1 suppresses gibberellin activity, reduces whole-plant transpiration and promotes drought tolerance in transgenic tomato
Plant Cell Environ.
37
113-123
2013
Arabidopsis thaliana
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2.1.1.275 gibberellin A9 O-methyltransferase
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