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Related Concept Videos

Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Published on: February 6, 2020

Solution structure of a tethered Lmo2(LIM2) /Ldb1(LID) complex.

Siavoush Dastmalchi1, Lorna Wilkinson-White, Ann H Kwan

  • 1School of Molecular Bioscience, University of Sydney, Sydney, New South Wales 2006, Australia.

Protein Science : a Publication of the Protein Society
|September 1, 2012
PubMed
Summary
This summary is machine-generated.

The LIM-only protein 2 (Lmo2) structure bound to Ldb1(LID) reveals how Lmo2 interacts with Ldb1. This interaction is crucial for hematopoietic development and understanding T-cell leukemia.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Hematopoiesis

Background:

  • LIM-only protein 2 (Lmo2) is vital for hematopoietic development.
  • Overexpression of Lmo2 in T-cells is linked to T-cell leukemia.
  • Lmo2 functions by mediating protein-protein interactions and forming transcriptional complexes.

Purpose of the Study:

  • To determine the solution structure of the LIM2 domain of Lmo2 bound to the LIM interaction domain (LID) of Ldb1.
  • To elucidate the molecular basis of Lmo2-Ldb1 interaction in transcriptional regulation.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to determine the solution structure.
  • Mutagenic studies to identify binding hotspots.

Main Results:

  • The ordered regions of Ldb1 in the complex align with previously identified binding hotspots.
  • The structure reveals specific interactions between Lmo2(LIM2) and Ldb1(LID).

Conclusions:

  • The binding of Lmo2 LIM domains to Ldb1 motifs involves disorder-to-order transitions.
  • Conformational changes in both Lmo2 and Ldb1 facilitate complex formation.
  • Understanding these structural dynamics is key to Lmo2's role in development and disease.