ArticleJournal of enzyme inhibition and medicinal chemistry2026
Porcine serum maltase-glucoamylase: structure, kinetics, and inhibition.
Article in Journal of enzyme inhibition and medicinal chemistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Maltase-glucoamylase (MGAM) is a small-intestinal enzyme comprising two tandem α-glucosidase units, NtMGAM and CtMGAM, each capable of hydrolysing maltodextrins into glucose. MGAM serves as a therapeutic target for managing postprandial hyperglycaemia; comprehensive insights into its full-length three-dimensional structure and inhibitor kinetics remains limited. Here, we demonstrate that the α-glucosidase in porcine serum is comparable to that encoded by the MGAM gene. Using cryo-electron microscopy, we determined the complex structure of serum MGAM with the inhibitor acarviosyl-maltotriose (AC5), which was found to bind exclusively to the active sites of each unit, confirming the presence of independent catalytic sites. AC5 was shown to exhibit mixed-type inhibition towards full-length serum MGAM and competitive inhibition against both recombinant NtMGAM and CtMGAM. The apparent mixed-type inhibition can be more accurately attributed to dual competitive inhibition mechanisms. These findings contribute to the advancement of functional foods and therapeutic interventions for postprandial hyperglycaemia and type 2 diabetes.
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