Answer:
Enzymes are divided
into six classes each with 4-13 sub-classes and named accordingly by a
four-digit number.
(i) Oxidoreductases/dehydrogenases
These enzymes take part in oxidation andreduction or transfer of .
S (reduced)
+ S' (oxidized) S (oxidized) +
S' (reduced)
(ii)
Transferees These enzymes transfer a functional group from one molecule to
another(other than hydrogen). The chemical group transfer does not occur in
free state.
(iii)
Hydrolases These enzymes catalyze the hydrolysis of bonds like ester, ether,
peptide, glycosidic C-C, C-halide, P-N etc.
(iv)Lyases
These enzymes causes cleavage, removal of groups without hydrolysis andaddition
of groups to double bonds or removal of groups producing double bond.
(v)Isomerases
These enzymes cause rearrangement of molecular structure to effect isomeric
changes. They are of three types, i.e., isomerases, epimerases and mutases.
Glucose - 6
- phosphate Fructose 6 - phosphate
(Aldose to
ketose group or vice-versa)
Glucose - 6
- phosphate Glucose-1 -phosphate
(Shifting
the position of side group)
Xylulose
5-phosphate Rjbulose-5-phosphate
(Change in
position of one constituent or carbon group)
(vi) Ligases
are enzymes catalysing bonding of two chemicals with the help of energyobtained
from ATP resulting formation of bonds such: as C?O, C?S,C?N and P?O e:g.,pyruvatecarboxylusePyruvric acid Oxaloacetic +ADP + Pi ?
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