Rational engineering of Lactobacillus acidophilus NCFM maltose phosphorylase into either trehalose or kojibiose dual specificity phosphorylase

Hiroyuki Nakai, B.O. Petersen, Y. Westphal, Adiphol Dilokpimol, Maher Abou Hachem, Jens Øllgaard Duus, H.A. Schols, Birte Svensson

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    Abstract

    Lactobacillus acidophilus NCFM maltose phosphorylase (LaMP) of the (alpha/alpha)(6)-barrel glycoside hydrolase family 65 (GH65) catalyses both phosphorolysis of maltose and formation of maltose by reverse phosphorolysis with beta-glucose 1-phosphate and glucose as donor and acceptor, respectively. LaMP has about 35 and 26% amino acid sequence identity with GH65 trehalose phosphorylase (TP) and kojibiose phosphorylase (KP) from Thermoanaerobacter brockii ATCC35047. The structure of L. brevis MP and multiple sequence alignment identified (alpha/alpha)(6)-barrel loop 3 that forms the rim of the active site pocket as a target for specificity engineering since it contains distinct sequences for different GH65 disaccharide phosphorylases. Substitution of LaMP His413-Glu421, His413-Ile418 and His413-Glu415 from loop 3, that include His413 and Glu415 presumably recognising the alpha-anomeric O-1 group of the glucose moiety at subsite +1, by corresponding segments from Ser426-Ala431 in TP and Thr419-Phe427 in KP, thus conferred LaMP with phosphorolytic activity towards trehalose and kojibiose, respectively. Two different loop 3 LaMP variants catalysed the formation of trehalose and kojibiose in yields superior of maltose by reverse phosphorolysis with (alpha 1, alpha 1)- and alpha-(1,2)- regioselectivity, respectively, as analysed by nuclear magnetic resonance. The loop 3 in GH65 disaccharide phosphorylase is thus a key determinant for specificity both in phosphorolysis and in regiospecific reverse phosphorolysis.
    Original languageEnglish
    JournalProtein Engineering Design and Selection (Print)
    Volume23
    Issue number10
    Pages (from-to)781-787
    ISSN1741-0126
    DOIs
    Publication statusPublished - 2010

    Keywords

    • reverse phosphorolysis
    • maltose phosphorylase
    • glycoside hydrolase family 65
    • Lactobacillus acidophilus NCFM
    • specificity engineering

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