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In vitro expression and activity of lycopene cyclase and β‐carotene hydroxylase from Erwinia herbicola
Author(s) -
Hundle Bhupinder S.,
O'Brien David A.,
Beyer Peter,
Kiemig Hans,
Hearst John E.
Publication year - 1993
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(93)81188-6
Subject(s) - biochemistry , enzyme , lycopene , zeaxanthin , lysis , erwinia , carotenoid , cyclase , in vitro , escherichia coli , chemistry , biosynthesis , enzyme assay , biology , gene , lutein
The cyclisation of lycopene to β‐carotene and the hydroxylation of β‐carotene to zeaxanthin are common enzymatic steps in the biosynthesis of carotenoids in a wide range of bacteria, fungi, and plants. We have individually expressed in E. coli the two genes coding for these enzymatic steps in Erwinia herbicola . The cyclase and hydroxylase enzymes have apparent molecular weights of 43 kDa and 22 kDa, respectively, as determined by SDS‐PAGE. Hydroxylase in vitro activity was obtained only in the cytoplasmic fraction. Cyclase also demonstrated enzyme activity in a crude cell‐free lysate, although to a lesser extent.