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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a...
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Related Experiment Video

Updated: Oct 21, 2025

PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions
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TXNIP interaction with GLUT1 depends on PI(4,5)P2.

Holly Dykstra1, Cassi LaRose1, Chelsea Fisk1

  • 1Van Andel Institute, Grand Rapids, MI 49503, USA.

Biochimica Et Biophysica Acta. Biomembranes
|September 3, 2021
PubMed
Summary
This summary is machine-generated.

Thioredoxin-interacting protein (TXNIP) binds to glucose transporter 1 (GLUT1) in a 1:1 ratio. This interaction, crucial for regulating glucose uptake, requires the lipid phosphatidylinositol 4,5-bisphosphate (PIP2).

Keywords:
Electron microscopyGLUT1Glucose metabolismNanodiscsPI(4,5)P(2)TXNIP (thioredoxin-interacting protein)

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Medicine

Background:

  • Glucose transporter 1 (GLUT1) facilitates glucose transport and is implicated in cancer and metabolic diseases.
  • Thioredoxin-interacting protein (TXNIP), an α-arrestin, acts as an adaptor for GLUT1 in clathrin-mediated endocytosis, regulating glucose uptake.
  • Understanding the GLUT1-TXNIP interaction is key to modulating cellular glucose metabolism.

Purpose of the Study:

  • To elucidate the molecular interaction between GLUT1 and TXNIP.
  • To characterize the binding stoichiometry and requirements of the GLUT1-TXNIP complex.

Main Methods:

  • Generation of GLUT1 lipid nanodiscs.
  • Isothermal titration calorimetry (ITC) to determine binding thermodynamics.
  • Single-particle electron microscopy (EM) for structural insights.

Main Results:

  • GLUT1 lipid nanodiscs and TXNIP were found to interact in a precise 1:1 molar ratio.
  • The interaction between GLUT1 and TXNIP was demonstrated to be dependent on the presence of phosphatidylinositol 4,5-bisphosphate (PIP2).

Conclusions:

  • The study defines the 1:1 binding stoichiometry of GLUT1 and TXNIP.
  • PIP2 is essential for mediating the interaction between GLUT1 and TXNIP, providing a molecular basis for TXNIP's role in GLUT1 regulation.