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Analysis of insertions/deletions in protein structures
1European Molecular Biology Laboratory, Heidelberg, Germany.
Journal of Molecular Biology
|March 20, 1992
Summary
Protein insertions and deletions (indels) are typically short and occur in loops, suggesting evolution targets these flexible regions. This study reveals insights into indel evolution and protein structure accommodation.
Area of Science:
- Structural bioinformatics
- Molecular evolution
- Protein sequence analysis
Background:
- Insertions and deletions (indels) are fundamental evolutionary events.
- Understanding indel behavior in protein evolution is crucial for deciphering protein structure-function relationships.
Purpose of the Study:
- To analyze the characteristics of indels in protein tertiary structures.
- To investigate the evolutionary dynamics and structural constraints of indels.
Main Methods:
- Analysis of a databank of multiple sequence alignments.
- Examination of protein tertiary structure.
- Statistical analysis of indel length, frequency, and location.
Main Results:
- Indels predominantly range from 1 to 5 residues.
- A correlation between intervening sequence length and residue identity suggests a stochastic indel process targeting ancestral loops.
- Protein structures appear to accommodate a limited average indel size.
- Reverse turn and coil conformations are preferred for indels and their edges.
Conclusions:
- Indels are biased towards short lengths and occur frequently in protein loops.
- Evolutionary processes involving indels are likely stochastic, with loops being primary targets.
- Protein structural constraints limit the size of accommodated indels.