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Abstract: Highlighting biomimetic recognition and shape-selective binding, highly crosslinked transition-state analogue-imprinted artificial hydrolases are synthesized from amino acid monomers. Two different transition-state analogues - TSAs - are used for the preparation of the enzyme mimic polymer catalysts. The catalytic hydrolysis of amino acid p-nitroanilides is found to be dependent on the geometry of the TSA imprints on the polymer matrix. The imprinted TSA facilitates tetrahedral complementarity to the transition-state intermediate of hydrolysis. The geometry of the 3D-memory cavity fabricated by the print molecule along with the catalytic entities is accountable for the higher catalytic competence of the imprinted enzyme mimics over the non-imprinted control polymers. The super crosslinked macroporous polymer matrix, in which the catalytic functions are suitably oriented in a '3D pocket' for selective binding of the substrate through H-bonding, is accountable for the high imprinting efficiency of the imprinted polymer catalysts. The imprinted mimics are found to be exhibiting cross-selectivity in their catalytic properties. Even though the mimics could not compete with native enzyme, they exhibit higher thermal stability, increased shelf-life and superior reusability
Template and target information: transition state analogue, TSA, catalysis
Author keywords: transition-state analogue, Artificial hydrolases, substrate recognition, 3D-memory cavity, Cross-selectivity and shape-selective hydrolysis