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Entry M0181    3.11.1.1    phosphonoacetaldehyde hydrolase

Previous Step

Step 08

The oxyanion initiates an elimination that releases the acetaldehyde product and regenerates the active site Lys53.

This reaction step has been inferred

GIF of Reaction Step M0181.stg08


Comment: Mechanism inferred as the inverse of step 1, due to the fact that there is no mechanistic information in the references.



Mechanisms

Unimolecular Elimination by the Conjugate Base

Mechanism Components

Bond Cleavage
Enzyme-Substrate Bond Cleavage
Bond Order Change
Intermediate Terminated
Intermediate Collapse
Overall Product Formed
Enzyme Regenerated

Amino acids involved in the reaction step.

Amino Acid Location of Function Activity Function
His56 Side Chain spectator Hydrogen Bond Donor
Ala45 Main Chain Carbonyl spectator Hydrogen Bond Acceptor
Electrostatic Stabiliser
Met49 Side Chain spectator Hydrogen Bond Acceptor
Electrostatic Stabiliser
Arg160 Side Chain spectator Hydrogen Bond Donor
Asp12 Side Chain spectator Hydrogen Bond Acceptor
Metal Ligand
Lys53 Side Chain reactant Nucleofuge
Covalently Attached

Metal Cofactors involved in Step 08

Metal Type Metal Identity Chain Activity Function
magnesium MG 502 x spectator Not Active

Reactive Centre

Bonds Formed Bonds Cleaved Bonds Changed in Order Atom Types Involved
None
C-N
The C-O bond changes from a single to double bond
C
N
O

View similar reactions in MACiE.


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