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Why are "natively unfolded" proteins unstructured under physiologic conditions?
V N Uversky1, J R Gillespie, A L Fink
1Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA. uversky@hydrogen.ucsc.edu
Proteins
|October 12, 2000
Summary
Natively unfolded proteins lack structure due to low hydrophobicity and high net charge. This unique characteristic defines their specific location in charge-hydrophobicity phase space, distinguishing them from folded proteins.
Area of Science:
- Biochemistry
- Structural Biology
- Protein Science
Background:
- Natively unfolded proteins lack a stable three-dimensional structure at neutral pH.
- Understanding the biophysical properties of these proteins is crucial for comprehending biological function.
Purpose of the Study:
- To investigate the biophysical characteristics that define natively unfolded proteins.
- To differentiate natively unfolded proteins from small globular folded proteins based on sequence analysis.
Main Methods:
- Analysis of amino acid sequences.
- Calculation of normalized net charge and mean hydrophobicity for protein sets.
- Localization of proteins within a charge-hydrophobicity phase space.
Main Results:
- Natively unfolded proteins occupy a distinct region in the charge-hydrophobicity phase space.
- Low overall hydrophobicity is a key feature of natively unfolded proteins.
- Large net charge is another defining characteristic of natively unfolded proteins.
Conclusions:
- A unique combination of low hydrophobicity and high net charge defines the structural properties of natively unfolded proteins.
- These findings provide a biophysical basis for identifying and understanding natively unfolded proteins.