A Saliva-Inspired Model of Enzymatic Starch Hydrolysis by Alpha Amylase
We demonstrate that the enzymatic activity of alpha-amylase (AA) can serve as an effective physicochemical trigger for membrane remodeling in giant unilamellar vesicles (GUVs). This work provides insight into how primitive protocellular reactions directly translate into the membrane's mechanical responses. Analysis of the potato starch utilized in this work is composed of ~26% amylose and ~75%…
Alpha-amylase (AA) enzyme activity can effectively trigger membrane remodeling in giant unilamellar vesicles (GUVs), according to new research. Potato starch, comprising around 26% amylose and 75% amylopectin, was used for this study. Quantitative DNS analysis showed a time- and concentration-dependent accumulation of reducing sugars during starch degradation by AA. HPLC-RID chromatograms revealed the synthesis of various glucose-based oligosaccharides, with maltose and maltotriose being the major products.
As these soluble hydrolysis products accumulated, they gradually increased the osmolarity of the extracellular medium surrounding the vesicles. This caused osmotic asymmetry across the membrane, leading to membrane deformation, curvature generation, vesicle deflation, and budding. The findings establish a quantitative basis for understanding membrane mechanics and shape transformations driven by external biochemical reactions.
This enzyme-driven remodeling strategy presents a simple yet powerful approach to inducing dynamic structural changes in artificial cells. The study sheds light on primitive protocellular processes, where metabolic activity and membrane mechanics were inherently coupled.
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