A glass menagerie of low complexity sequences

Area of Science:

• Biophysics
• Developmental Biology
• Protein Science

Background:

• Simple protein sequences are crucial for biological complexity.
• The traditional sequence-structure-function paradigm may not fully explain these proteins.
• A new paradigm is emerging where protein ensembles exhibit collective behaviors.

Purpose of the Study:

• To explore how low-complexity protein sequences fulfill their functions.
• To investigate the role of dynamic material properties and phase changes in protein function.
• To elucidate new principles of biological information flow.

Main Methods:

• Analysis of protein ensembles and their phase transitions.
• Thermodynamic characterization of glass-like protein assemblies.
• Investigating information flow mechanisms beyond the central dogma.

Main Results:

• Protein function can derive from the collective properties of ensembles, not just individual structures.
• Phase changes (liquid, crystalline, glassy) are key to protein ensemble function.
• Glass-like protein assemblies exhibit unique thermodynamics.

Conclusions:

• Protein function is not solely determined by individual structure but by collective dynamics.
• Phase transitions in protein ensembles represent a new dimension in the sequence-structure-function paradigm.
• These findings offer insights into biological information processing that can operate outside classical molecular biology principles.