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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...

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Homogeneous Glycoconjugate Produced by Combined Unnatural Amino Acid Incorporation and Click-Chemistry for Vaccine Purposes
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Cattle Ly49 is polymorphic.

Melanie J Dobromylskyj1, Timothy Connelley, John A Hammond

  • 1Livestock Infectious Disease Programme, Institute for Animal Health, Compton RG20 7NN, UK.

Immunogenetics
|November 14, 2009
PubMed
Summary

Cattle possess a unique, expanded KIR gene family and a polymorphic Ly49 gene. Researchers discovered novel Ly49 sequences, suggesting ancient allelic lineages or a contracted gene family, highlighting cattle

Area of Science:

  • Immunogenetics
  • Comparative Genomics
  • Mammalian Immunology

Background:

  • Cattle exhibit an expanded KIR gene family, a trait uncommon in non-primate species.
  • A single, presumed monomorphic Ly49 gene was previously identified in cattle.

Purpose of the Study:

  • To investigate the genetic diversity of the Ly49 gene family in cattle.
  • To characterize novel Ly49 sequences identified in cattle.

Main Methods:

  • Identification and sequencing of Ly49 cDNA from cattle.
  • Bioinformatic analysis of deduced amino acid sequences.

Main Results:

  • Two novel Ly49 cDNA sequences were identified in cattle.
  • These sequences encode predicted molecules differing from the original sequence by 14 and 16 amino acids.

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  • Analysis suggests these variants may represent ancient allelic lineages or significant polymorphism within a single Ly49 gene.

    • Conclusions:

    • Cattle possess a polymorphic Ly49 gene, in addition to their expanded polymorphic KIR gene family.
    • The findings challenge the notion of a monomorphic Ly49 gene in cattle and suggest complex evolutionary history.
    • This unique genetic landscape in cattle offers insights into immune system evolution.