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Structure of the starch-debranching enzyme barley limit dextrinase reveals homology of the N-terminal domain to CBM21.


ABSTRACT: Barley limit dextrinase (HvLD) is a debranching enzyme from glycoside hydrolase family 13 subfamily 13 (GH13_13) that hydrolyses ?-1,6-glucosidic linkages in limit dextrins derived from amylopectin. The structure of HvLD was solved and refined to 1.9 Å resolution. The structure has a glycerol molecule in the active site and is virtually identical to the structures of HvLD in complex with the competitive inhibitors ?-cyclodextrin and ?-cyclodextrin solved to 2.5 and 2.1 Å resolution, respectively. However, three loops in the N-terminal domain that are shown here to resemble carbohydrate-binding module family 21 were traceable and were included in the present HvLD structure but were too flexible to be traced and included in the structures of the two HvLD-inhibitor complexes.

SUBMITTER: Moller MS 

PROVIDER: S-EPMC3433187 | biostudies-literature | 2012 Sep

REPOSITORIES: biostudies-literature

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Structure of the starch-debranching enzyme barley limit dextrinase reveals homology of the N-terminal domain to CBM21.

Møller Marie Sofie MS   Abou Hachem Maher M   Svensson Birte B   Henriksen Anette A  

Acta crystallographica. Section F, Structural biology and crystallization communications 20120829 Pt 9


Barley limit dextrinase (HvLD) is a debranching enzyme from glycoside hydrolase family 13 subfamily 13 (GH13_13) that hydrolyses α-1,6-glucosidic linkages in limit dextrins derived from amylopectin. The structure of HvLD was solved and refined to 1.9 Å resolution. The structure has a glycerol molecule in the active site and is virtually identical to the structures of HvLD in complex with the competitive inhibitors α-cyclodextrin and β-cyclodextrin solved to 2.5 and 2.1 Å resolution, respectively  ...[more]

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