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3.4.22.2: papain

This is an abbreviated version!
For detailed information about papain, go to the full flat file.

Word Map on EC 3.4.22.2

Reaction

Hydrolysis of proteins with broad specificity for peptide bonds, but preference for an amino acid bearing a large hydrophobic side chain at the P2 position. Does not accept Val in P1' =

Synonyms

Adolph's Meat Tenderizer, arbuz, CpXCP5, EC 3.4.4.10, enzeco papain, papain, papain-like cysteine protease, papain-like protease, papaine, papaya peptidase I, papaya proteinase 1, Papaya proteinase I, papayotin, PLCP, PLpro, PPI, summetrin, velardon

ECTree

     3 Hydrolases
         3.4 Acting on peptide bonds (peptidases)
             3.4.22 Cysteine endopeptidases
                3.4.22.2 papain

Activating Compound

Activating Compound on EC 3.4.22.2 - papain

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ACTIVATING COMPOUND
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
2-mercaptopropionic acid
-
required, complete activation at 0.05 N when the enzyme concentration is 0.49 mM
Cys
-
activates
cysteine
the requirement for reducing conditions during the activation process is investigated with 20 mM DTT or 20 mM cysteine, propapain does not convert to papain even after prolonged incubation with DTT, whereas in presence of 20 mM cysteine, the activation occurs between 30 and 40 min at 50°C
EDTA
-
required for maximal activity
glutathione
-
-
Hg2+
papain activity increases to a maximum of 111.03% (non-competitive type activation) at a concentration of 0.000001x01mol/l Hg2+, but is almost completely deactivated at concentrations above 0.0001 mol/lx01Hg2+. The inhibition of Hg2+ on papain is a competitive and uncompetitive mixed type inhibition
Reducing agents
-
e.g. 2,3-dimercaptopropanol, activates
-
Sodium borohydride
-
activates
thiol compounds
-
activate
additional information
-