Pig intestinal microvillar maltase-glucoamylase. Structure and membrane insertion

The NH2-terminal sequence (25 residues) of amphiphilic single polypeptide chain maltase-glucoamylase (EC 3.2.1.20) was determined by gas-phase sequencing. The result indicates that the NH2-terminal segment anchors the enzyme to the microvillar membrane. The single-chain form and the proteolytically...

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Veröffentlicht in:The Journal of biological chemistry 1986-09, Vol.261 (26), p.12306-12309
Hauptverfasser: Norén, O, Sjöström, H, Cowell, G M, Tranum-Jensen, J, Hansen, O C, Welinder, K G
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container_end_page 12309
container_issue 26
container_start_page 12306
container_title The Journal of biological chemistry
container_volume 261
creator Norén, O
Sjöström, H
Cowell, G M
Tranum-Jensen, J
Hansen, O C
Welinder, K G
description The NH2-terminal sequence (25 residues) of amphiphilic single polypeptide chain maltase-glucoamylase (EC 3.2.1.20) was determined by gas-phase sequencing. The result indicates that the NH2-terminal segment anchors the enzyme to the microvillar membrane. The single-chain form and the proteolytically processed two-chain form have two distinct active sites differing in heat stability. However, both sites are sensitive to chonduritol B-epoxide and have similar substrate specificity. The amphiphilic single-chain maltase-glucoamylase and the amphiphilic proteolytically processed form were inserted into liposomes and studied by electron microscopy. The results showed that the enzyme is predominantly present as a homodimeric complex in the membrane.
doi_str_mv 10.1016/S0021-9258(18)67239-4
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source MEDLINE; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects alpha-Glucosidases - analysis
Amino Acid Sequence
Analytical, structural and metabolic biochemistry
Animals
Biological and medical sciences
Enzymes and enzyme inhibitors
Fundamental and applied biological sciences. Psychology
Glucosidases - analysis
Hydrolases
Intestines - ultrastructure
Liposomes
Membrane Proteins - analysis
Microscopy, Electron
Microvilli - enzymology
Models, Molecular
Swine
title Pig intestinal microvillar maltase-glucoamylase. Structure and membrane insertion
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