How a protein uses different energy molecules to switch functions
Regulation of Human Tissue Transglutaminase Function by Magnesium-Nucleotide Complexes
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A protein called tissue transglutaminase can do two jobs: glue tissues together or use energy molecules. It uses two similar energy molecules — one with guanine (Mg-GTP) and one with adenine (Mg-ATP) — but treats them very differently.
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Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A protein called tissue transglutaminase can do two jobs: glue tissues together or use energy molecules. It uses two similar energy molecules — one with guanine (Mg-GTP) and one with adenine (Mg-ATP) — but treats them very differently.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 533 / 58
Evidence Score
Researchers compare people who have a condition (cases) with similar people who do not (controls), looking back in time for differences in exposure. Useful but more prone to bias.
Publication
Authors
Lai TS, Slaughter TF, Peoples KA, Hettasch JM, Greenberg CS
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Claims (6)
When Mg-GTP binds to the enzyme tissue transglutaminase, it prevents the enzyme from being broken down by trypsin; Mg-ATP does not have this effect, suggesting that Mg-GTP changes the enzyme's shape in a way that makes it more stable.
Human tissue transglutaminase enzyme uses two magnesium-bound nucleotides, Mg-ATP and Mg-GTP, as substrates for hydrolysis, and Mg-ATP binds more tightly to the enzyme than Mg-GTP, suggesting differences in how the enzyme interacts with each molecule.
In human tissue transglutaminase, magnesium-bound ATP strongly blocks GTP breakdown at low concentrations, while magnesium-bound GTP only weakly blocks ATP breakdown even at high concentrations, showing that the two molecules affect each other's activity unequally.
Magnesium-bound guanine nucleotides (Mg-GTP, Mg-GDP, Mg-GMP) reduce the activity of human tissue transglutaminase at specific concentrations, while magnesium-bound adenine nucleotides do not, indicating that the enzyme is selectively regulated by guanine-based molecules.
The enzyme transglutaminase in human tissues has separate molecular pockets that bind Mg-GTP and Mg-ATP, allowing it to respond differently to each molecule based on their chemical structure.