Specific recognition between intrinsically disordered LEF and DNA

Area of Science:

• Molecular Biology
• Biophysics
• Structural Biology

Background:

• Lymphoid enhancer-binding factor-1 (LEF-1) is a transcription factor regulating the human T cell receptor α enhancer.
• LEF-1 is an intrinsically disordered protein known to bind DNA's minor groove.

Purpose of the Study:

• To elucidate the mechanism of specific DNA recognition by intrinsically disordered LEF-1.
• To investigate the role of LEF-1's disordered C-tails in DNA binding.

Main Methods:

• Explicit-solvent multiple molecular dynamics (MD) simulations at room and high temperatures.
• Kinetic analysis and mutant simulations (Gly38Ala, Met11Gly).
• Kolmogorov-Smirnov (KS) P test analysis.

Main Results:

• Disordered LEF-1 C-tails exhibit both specific and nonspecific interactions with DNA's minor groove.
• Specific binding accelerates complex formation; bound and apo-states unfold via a two-state process.
• Mutant simulations indicate significant reduction in electrostatic interactions between DNA and LEF-1.

Conclusions:

• Specific DNA recognition by LEF-1 likely follows an induced-fit mechanism.
• The findings provide insights into DNA-protein interactions involving intrinsically disordered proteins.
• The employed methods are applicable to studying other disordered protein-DNA recognition processes.