Artificial Trinuclear Metallopeptidase Synthesized by Cross-Linkage of a Molecular Bowl with a Polystyrene Derivative
摘要:
A novel methodology is reported for construction of active sites of artificial multinuclear metalloenzymes: transfer of metal-chelating sites confined in a prebuilt cage to a polymeric backbone. Artificial active sites comprising two or three moieties of Cu(II) complex of tris(2-aminoethyl)amine (tren) were prepared by transfer of Cu(II)tren units confined in a molecular bowl (MB) to poly(chloromethylstyrene-co-divinylbenzene) (PCD). By treatment of unreacted chloro groups of the resulting PCD with methoxide and destruction of the MB moieties attached to PCD with acid followed by addition of Cu(II) ion to the exposed tren moieties, catalytic polymers with peptidase activity were obtained. The average number (beta) of proximal Cu(II)tren moieties in the active site of the artificial multinuclear metallopeptidase was determined by quantifying the Cu(II) content. Several species of the artificial metallopeptidases with different beta contents were prepared and examined for catalytic activity in hydrolysis of various cinnamoyl amide derivatives. The PCD-based catalytic polymers did not hydrolyze a neutral amide but effectively hydrolyzed carboxyl-containing amides (N-cinnamoyl glycine, N-cinnamoyl beta-alanine, and N-cinnamoyl gamma-amino butyrate). Analysis of the kinetic data revealed that the active sites comprising three Cu(IT)tren units were mainly responsible for the catalytic activity. When analyzed in terms of k(cat), the catalytic activity of the PCD-based artificial peptidase was comparable to or better than the catalytic antibody with the highest peptidase activity reported to date. A mechanism is suggested for the effective cooperation among the three metal centers of the active site in hydrolysis of the carboxyl-containing amides.
MICROBIOLOGICAL METHOD FOR SYNTHESIZING CINNAMOYL AMIDE DERIVATIVES OF AMINO ACIDS
申请人:Lorquin Jean
公开号:US20120142778A1
公开(公告)日:2012-06-07
Method for the microbiological production of cinnamoyl amide derivatives of amino acids, certain products that result therefrom and uses thereof, especially as antioxidants.
The invention provides a cinnamic acid derivative having a novel spacer introduced into cinnamic acid which is photodimerizable, a cinnamic acid-polymer derivative photocurable with high sensitivity and efficiency obtainable by introducing the above cinnamic acid derivative into a host polymer such as a glycosaminoglycan, and a photocrosslinked cinnamic acid-polymer derivative obtainable by exposing the same cinnamic aicd-polymer derivative to ultraviolet light irradiation.