Abstract
Endoplasmic reticulum aminopeptidase 1 (ERAP1) is an essential component of the immune system, because it trims peptide precursors and generates the N--restricted epitopes. To examine ERAP1's unique properties of length- and sequence-dependent processing of antigen precursors, we report a 2.3 Å resolution complex structure of the ERAP1 regulatory domain. Our study reveals a binding conformation of ERAP1 to the carboxyl terminus of a peptide, and thus provides direct evidence for the molecular ruler mechanism.
Publication types
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Research Support, N.I.H., Extramural
MeSH terms
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Allosteric Site
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Aminopeptidases / chemistry*
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Aminopeptidases / physiology*
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Antigen Presentation
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Antigens / chemistry
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Binding Sites
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Endoplasmic Reticulum / metabolism
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Epitopes / chemistry
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Histidine / chemistry
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Histocompatibility Antigens Class I / chemistry
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Humans
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Minor Histocompatibility Antigens
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Models, Molecular
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Peptides / chemistry
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Protein Binding
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Protein Structure, Tertiary
Substances
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Antigens
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Epitopes
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Histocompatibility Antigens Class I
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Minor Histocompatibility Antigens
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Peptides
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Histidine
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Aminopeptidases
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ERAP1 protein, human