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4.3.1.2: methylaspartate ammonia-lyase

This is an abbreviated version!
For detailed information about methylaspartate ammonia-lyase, go to the full flat file.

Word Map on EC 4.3.1.2

Reaction

L-threo-3-methylaspartate
=
mesaconate
+
NH3

Synonyms

3-methyl-L-aspartic acid ammonia-lyase, 3-methylaspartase, 3-methylaspartate ammonia lyase, 3-methylaspartate ammonia-lyase, ammonia-lyase, methylaspartate, beta-methylaspartase, Ch-MAL, MAL, methylaspartate ammonia lyase, methylaspartate ammonia-lyase, threo-3-methyl-L-aspartate ammonia-lyase, threo-3-methylaspartase ammonia-lyase

ECTree

     4 Lyases
         4.3 Carbon-nitrogen lyases
             4.3.1 Ammonia-lyases
                4.3.1.2 methylaspartate ammonia-lyase

Engineering

Engineering on EC 4.3.1.2 - methylaspartate ammonia-lyase

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PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
C361A
kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 47% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type)
C361K
mutant shows no reactivity. Conversion 2h: 10% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type)
F170A
kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 63% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type)
H194A
enhanced diastereoselectivities
K331A
enhanced diastereoselectivities
L384A
Q172A
kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 16% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type)
Q172N
mutant shows no reactivity. Conversion 2h: 6% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type)
Q329A
enhanced diastereoselectivities
Q73N
mutant shows very low-level amination activity preventing the measurement of kinetic parameters. Conversion 2h: 18% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type)
T360A
kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 38% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 93:7 (89:11 wild-type)
T360S
kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 76% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 86:14 (89:11 wild-type)
Y356A
kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 24% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type)