Structural basis for the specificity of the reducing end xylose-releasing exo-oligoxylanase from Bacillus halodurans C-125. Fushinobu, S., Hidaka, M., Honda, Y., Wakagi, T., Shoun, H., & Kitaoka, M. Journal of Biological Chemistry, 2005.
abstract   bibtex   
Reducing end xylose-releasing exo-oligoxylanase from Bacillus halodurans C-125 (Rex) hydrolyzes xylooligosaccharides whose degree of polymerization is greater than or equal to 3, releasing the xylose unit at the reducing end. It is a unique exo-type glycoside hydrolase that recognizes the xylose unit at the reducing end in a very strict manner, even discriminating the β-anomeric hydroxyl configuration from the α-anomer or 1-deoxyxylose. We have determined the crystal structures of Rex in unliganded and complex forms at 1.35-2.20-Å resolution and revealed the structural aspects of its three subsites ranging from -2 to +1. The structure of Rex was compared with those of endo-type enzymes in glycoside hydrolase subfamily 8a (GH-8a). The catalytic machinery of Rex is basically conserved with other GH-8a enzymes. However, subsite +2 is blocked by a barrier formed by a kink in the loop before helix α 10 . His-319 in this loop forms a direct hydrogen bond with the β-hydroxyl of xylose at subsite +1, contributing to the specific recognition of anomers at the reducing end. © 2005 by The American Society for Biochemistry and Molecular Biology, Inc.
@article{
 title = {Structural basis for the specificity of the reducing end xylose-releasing exo-oligoxylanase from Bacillus halodurans C-125},
 type = {article},
 year = {2005},
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 abstract = {Reducing end xylose-releasing exo-oligoxylanase from Bacillus halodurans C-125 (Rex) hydrolyzes xylooligosaccharides whose degree of polymerization is greater than or equal to 3, releasing the xylose unit at the reducing end. It is a unique exo-type glycoside hydrolase that recognizes the xylose unit at the reducing end in a very strict manner, even discriminating the β-anomeric hydroxyl configuration from the α-anomer or 1-deoxyxylose. We have determined the crystal structures of Rex in unliganded and complex forms at 1.35-2.20-Å resolution and revealed the structural aspects of its three subsites ranging from -2 to +1. The structure of Rex was compared with those of endo-type enzymes in glycoside hydrolase subfamily 8a (GH-8a). The catalytic machinery of Rex is basically conserved with other GH-8a enzymes. However, subsite +2 is blocked by a barrier formed by a kink in the loop before helix α 10 . His-319 in this loop forms a direct hydrogen bond with the β-hydroxyl of xylose at subsite +1, contributing to the specific recognition of anomers at the reducing end. © 2005 by The American Society for Biochemistry and Molecular Biology, Inc.},
 bibtype = {article},
 author = {Fushinobu, S. and Hidaka, M. and Honda, Y. and Wakagi, T. and Shoun, H. and Kitaoka, M.},
 journal = {Journal of Biological Chemistry},
 number = {17}
}

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