Association of Novel Domain in Active Site of Archaic Hyperthermophilic Maltogenic Amylase from Staphylothermus marinus

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Staphylothermus marinus maltogenic amylase (SMMA) is a novel extreme thermophile maltogenic amylase with an optimal temperature of 100 degrees C, which hydrolyzes alpha-(1-4)-glycosyl linkages in cyclodextrins and in linear malto-oligosaccharides. This enzyme has along N-terminal extension that is conserved among archaic hyperthermophilic amylases but is not found in other hydrolyzing enzymes from the glycoside hydrolase 13 family. The SMMA crystal structure revealed that the N-terminal extension forms an N' domain that is similar to carbohydrate-binding module 48, with the strand-loop-strand region forming a part of the substrate binding pocket with several aromatic residues, including Phe-95, Phe-96, andTyr-99. A structural comparison with conventional cyclodextrin-hydrolyzing enzymes revealed a striking resemblance between the SMMA N' domain position and the dimeric N domain position in bacterial enzymes. This result suggests that extremophilic archaea that live at high temperatures may have adopted a novel domain arrangement that combines all of the substrate binding components within a monomeric subunit. The SMMA structure provides a molecular basis for the functional properties that are unique to hyperthermophile malto-genic amylases from archaea and that distinguish SMMA from moderate thermophilic or mesophilic bacterial enzymes.
Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Issue Date
2012-03
Language
English
Article Type
Article
Keywords

STARCH-BINDING DOMAIN; BACILLUS-STEAROTHERMOPHILUS NEOPULLULANASE; VULGARIS R-47 ALPHA-AMYLASE-1; COMPLETE GENOME SEQUENCE; FAMILY 11 XYLANASE; ALPHA-AMYLASE; CRYSTAL-STRUCTURE; SULFOLOBUS-SOLFATARICUS; 3-DIMENSIONAL STRUCTURE; PYROCOCCUS-FURIOSUS

Citation

JOURNAL OF BIOLOGICAL CHEMISTRY, v.287, no.11, pp.7979 - 7989

ISSN
0021-9258
DOI
10.1074/jbc.M111.304774
URI
http://hdl.handle.net/10203/104165
Appears in Collection
BS-Journal Papers(저널논문)
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