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In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity
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Naturally occurring ERAP1 haplotypes encode functionally distinct alleles with fine substrate specificity.

Emma Reeves1, Christopher J Edwards, Tim Elliott

  • 1Cancer Sciences Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom.

Journal of Immunology (Baltimore, Md. : 1950)
|June 5, 2013
PubMed
Summary
This summary is machine-generated.

Endoplasmic reticulum aminopeptidase 1 (ERAP1) alleles vary in function, impacting T cell responses. These distinct ERAP1 variations influence disease predisposition by altering peptide presentation to T cells.

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Area of Science:

  • Immunology
  • Genetics

Background:

  • Endoplasmic reticulum aminopeptidase 1 (ERAP1) plays a crucial role in trimming peptides for MHC class I presentation, which is vital for CD8(+) T cell responses.
  • Single-nucleotide polymorphisms (SNPs) in ERAP1 are linked to autoimmune diseases and cervical carcinoma, but their independent or haplotype-based effects remain unclear.

Purpose of the Study:

  • To investigate whether ERAP1 SNPs form distinct haplotypes and encode functionally different alleles.
  • To characterize the functional variations of different ERAP1 alleles using a range of substrates.

Main Methods:

  • Sequencing of ERAP1 in 20 individuals.
  • Functional characterization of ERAP1 alleles using diverse peptide substrates.

Main Results:

  • ERAP1 SNPs form distinct haplotypes in the human population.
  • These haplotypes encode functionally distinct ERAP1 alleles, exhibiting "normal," "hypofunctional," or "hyperfunctional" activities.
  • Each ERAP1 allele shows a consistent trend bias towards one of these functional activities.

Conclusions:

  • The combination of MHC class I and ERAP1 alleles influences the repertoire of presented peptides.
  • This allelic interplay has significant implications for an individual's predisposition to diseases like autoimmune conditions and cancer.