title: Pentynyl dextran as a support matrix for immobilization of serine protease subtilisin Carlsberg and its use for transesterification of N-acetyl-L-phenylalanine ethyl ester in organic media.
abstract: In this study, serine protease (subtilisin Carlsberg) was immobilized on pentynyl dextran (PyD, O-alkynyl ether of dextran, 1) and used for the transesterification of N-acetyl-L-phenylalanine ethyl ester (2) with different aliphatic (1-propanol, 1-butanol, 1-pentanol, 1-hexanol) and aromatic (benzyl alcohol, 2-phenyl ethanol, 4-phenyl-1-butanol) alcohols in tetrahydrofuran (THF). The effect of carbon chain length in aliphatic and aromatic alcohols on initial and average transesterification rate, transesterification activity of immobilized enzyme and yield of the reaction under selected reaction conditions was investigated. The transesterification reactivity of the enzyme and yield of the reaction increased as the chain length of the alcohols decreased. Furthermore, almost no change in yield was observed when the immobilized enzyme was repeatedly used for selected alcohols over six cycles. Intrinsic fluorescence analysis showed that the catalytic activity of the immobilized enzyme in THF was maintained due to retention of the tertiary structure of the enzyme after immobilization on PyD (1).
authors: Department of Bioscience and Biotechnology, Center for Biotechnology Research in UBITA(CBRU), Konkuk University, Seoul, 143-701, Republic of Korea.
authors: Muhammad Nazir
authors: MN
authors: Tahir
authors: Eunae
authors: E
authors: Cho
authors: Petra
authors: P
authors: Mischnick
authors: Jae Yung
authors: JY
authors: Lee
authors: Jae-Hyuk
authors: JH
authors: Yu
authors: Seunho
authors: S
authors: Jung
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D003911:Dextrans / Q000737:chemistry*; D004800:Enzymes, Immobilized / Q000737:chemistry*; D010649:Phenylalanine / Q000031:analogs & derivatives* / Q000737:chemistry; D013381:Subtilisins / Q000737:chemistry*
chemical_list: D000438:Alcohols; D003911:Dextrans; D004800:Enzymes, Immobilized; C026868:N-acetylphenylalanine ethyl ester; D010649:Phenylalanine; D013381:Subtilisins