Dynamics and structural features of the eEF1A1 and eEF1A2 paralogs.

Area of Science:

• Molecular Biology
• Structural Biology
• Biochemistry

Background:

• Translation elongation factors eEF1A1 and eEF1A2 share 97% sequence identity but have distinct expression patterns and disease associations.
• The molecular basis for these paralog-specific differences, despite high homology, remains poorly understood.

Purpose of the Study:

• To investigate the structural dynamics and conformational differences between eEF1A1 and eEF1A2.
• To elucidate the molecular mechanisms underlying their distinct protein interactions and disease associations.

Main Methods:

• Hydrogen-deuterium exchange mass spectrometry (HDX-MS)
• Molecular dynamics (MD) simulations
• Small-angle X-ray scattering (SAXS)

Main Results:

• eEF1A1 and eEF1A2 exhibit distinct structural dynamics and organizations.
• eEF1A2 is compact and stable, while eEF1A1 displays multiple conformations, including domain dynamics and dimerization.
• eEF1A1 facilitates protein dimerization, unlike eEF1A2, challenging prior crystallographic data.

Conclusions:

• Distinct structural dynamics explain functional divergence between eEF1A1 and eEF1A2.
• These findings offer insights into paralog-specific non-translational roles and disease contributions.
• The study reveals eEF1A1's propensity for dimerization, contrasting with eEF1A2's monomeric state.