Removal of starch granule-associated proteins affects amyloglucosidase hydrolysis of rice starch granules

Mengting Ma, Zekun Xu, Peng Li, Zhongquan Sui*, Harold Corke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Starch granule-associated proteins (SGAPs) include granule-surface proteins (SGSPs) and granule-channel proteins (SGCPs). To investigate impacts of SGAPs on amyloglucosidase (AMG) hydrolysis, waxy and non-waxy rice starches had their SGCPs or SGAPs removed. Removal of SGAPs or SGCPs did not affect morphology and amylopectin chain distribution but decreased relative crystallinity. Removal of SGAPs increased the digestion rate, AMG binding ability and pore diameter of hydrolyzed granules, and accelerated changes in relative crystallinity and destruction of crystalline region on hydrolysis. However, after removing SGCPs, AMG only bound to surface and attacked of the fingerprint of protein bodies on granules, with decreased hydrolysis rate. The degree of change in hydrolysis rate was not determined by SGCPs content of rice starch. These results implied that SGCPs had a more dominant role in AMG hydrolysis of rice starch than did SGSPs. This study provides novel information about the role of SGAPs in AMG hydrolysis mechanisms.

Original languageEnglish
Article number116674
JournalCarbohydrate Polymers
Volume247
DOIs
StatePublished - 1 Nov 2020
Externally publishedYes

Keywords

  • Amyloglucosidase
  • Enzymatic hydrolysis
  • Rice starch
  • Starch granule-associated proteins
  • Starch granule-channel proteins
  • Starch granule-surface proteins

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