Ig-like domains on bacteriophages: a tale of promiscuity and deceit

Journal of Molecular Biology
James S FraserAlan R Davidson

Abstract

The immunoglobulin (Ig) fold is one of the most important structures in biology, playing essential roles in the vertebrate immune response, cell adhesion, and many other processes. Through bioinformatic analysis, we have discovered that Ig-like domains are often found in the constituent proteins of tailed double-stranded (ds) DNA bacteriophage particles, and are likely displayed on the surface of these viruses. These phage Ig-like domains fall into three distinct sequence families, which are similar to the classic immunoglobulin domain (I-Set), the fibronectin type 3 repeat (FN3), and the bacterial Ig-like domain (Big2). The phage Ig-like domains are very promiscuous. They are attached to more than ten different functional classes of proteins, and found in all three morphogenetic classes of tailed dsDNA phages. In addition, they reside in phages that infect a diverse set of gram negative and gram positive bacteria. These domains are deceptive because many are added to larger proteins through programmed ribosomal frameshifting, so that they are not always detected by standard protein sequence searching procedures. In addition, the presence of unrecognized Ig-like domains in a variety of phage proteins with different functions ha...Continue Reading

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