Download MendeleyThe structure of barley alpha-amylase isozyme 1 reveals a novel role of domain C in substrate recognition and binding: a pair of sugar tongs
Robert, X., Haser, R., Gottschalk, T.E., Ratajczak, F., Driguez, H., Svensson, B., Aghajari, N.(2003) Structure 11: 973-984
- PubMed: 12906828
- DOI: https://doi.org/10.1016/s0969-2126(03)00151-5
- Primary Citation of Related Structures:
1HT6, 1P6W - PubMed Abstract:
Though the three-dimensional structures of barley alpha-amylase isozymes AMY1 and AMY2 are very similar, they differ remarkably from each other in their affinity for Ca(2+) and when interacting with substrate analogs. A surface site recognizing maltooligosaccharides, not earlier reported for other alpha-amylases and probably associated with the different activity of AMY1 and AMY2 toward starch granules, has been identified. It is located in the C-terminal part of the enzyme and, thus, highlights a potential role of domain C. In order to scrutinize the possible biological significance of this domain in alpha-amylases, a thorough comparison of their three-dimensional structures was conducted. An additional role for an earlier-identified starch granule binding surface site is proposed, and a new calcium ion is reported.
Organizational Affiliation:
Laboratoire de BioCristallographie, Institut de Biologie et Chimie des Protéines, UMR 5086-CNRS/UCBL1, 7 Passage du Vercors, F-69367 Lyon cedex 07, France.
