DomIns: a web resource for domain insertions in known protein structures

Area of Science:

• Molecular Biology
• Structural Biology
• Bioinformatics

Background:

• Proteins are fundamental biological molecules composed of single or multiple domains.
• Multi-domain proteins are crucial for organismal functions, with domain organization dictated by evolutionary recombination.
• Typically, multi-domain proteins are formed by linking domains sequentially (N-terminus to C-terminus).

Purpose of the Study:

• To identify and document instances of domain insertion in protein structures.
• To analyze the novel domain organization resulting from domain insertion.
• To provide a web resource cataloging domain insertions in the SCOP database.

Main Methods:

• Analysis of protein structures from the Structural Classification of Proteins (SCOP) database.
• Identification of proteins where domains are inserted into other domains, disrupting sequence contiguity.
• Development of a web server to host the documented domain insertion data.

Main Results:

• A significant fraction of multi-domain proteins are formed via domain insertion, not just sequential linkage.
• Domain insertion leads to novel protein architectures and domain organizations.
• A comprehensive web resource documenting these domain insertions is now available.

Conclusions:

• Domain insertion represents an important mechanism in the evolution of protein diversity.
• Understanding domain insertion provides insights into protein structure-function relationships.
• The developed web resource facilitates further research into protein evolution and structural biology.