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Sequence codes for extended conformation: a neighbor-dependent sequence analysis of loops in proteins
1Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111.
Proteins
|January 11, 2001
Summary
Protein loops, often on the surface, exhibit distinct sequence preferences. This study reveals amino acid pairs that favor loop formation, aiding in protein structure prediction.
Area of Science:
- Structural biology
- Bioinformatics
- Protein science
Background:
- Protein loops are crucial for structure and function but are less understood than regular secondary structures.
- Understanding loop sequences is key to predicting protein three-dimensional structures.
Purpose of the Study:
- To analyze the sequence characteristics and preferences of protein loops.
- To investigate the relationship between loop sequence, length, location, and secondary structure context.
Main Methods:
- Extensive sequence analysis of a protein loop database derived from the Protein Data Bank.
- Categorization of loops by length and connection to secondary structures.
- Neighbor-dependent sequence analysis to determine residue propensity within loops.
Main Results:
- 94.4% of analyzed loops are surface-exposed.
- Surface loops are predominantly hydrophilic; interior loops are more neutral.
- Identified specific amino acid dyads with a high preference for loop conformation.
Conclusions:
- Protein loop sequences display distinct preferences influenced by neighboring residues.
- The findings provide insights into the intrinsic sequence-structure relationship of loops.
- This data can contribute to developing algorithms for recognizing loop sequences in proteins.