ATP is required for in vitro assembly of MHC class I antigens but not for transfer of peptides across the ER membrane

Détails

ID Serval
serval:BIB_562D904A1989
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
ATP is required for in vitro assembly of MHC class I antigens but not for transfer of peptides across the ER membrane
Périodique
Cell
Auteur⸱e⸱s
Levy  F., Gabathuler  R., Larsson  R., Kvist  S.
ISSN
0092-8674 (Print)
Statut éditorial
Publié
Date de publication
10/1991
Volume
67
Numéro
2
Pages
265-74
Notes
Journal Article --- Old month value: Oct 18
Résumé
We have translated the HLA-B27 heavy chain in vitro and studied its assembly with beta 2-microglobulin and peptide in microsomes from human cells. The assembly process requires ATP. However, the translocation of peptide across the endoplasmic reticulum (ER) membrane does not require ATP, and binding of biotinylated peptide to BiP, an ER luminal protein, occurs after ATP depletion. Proteinase K treatment of the microsomes does not block peptide translocation. Thus, ATP is required in the lumen of the ER for efficient assembly to occur. Microsomes prepared from Raji and T1 cells show similar levels of assembly, whereas assembly in T2 microsomes is 10-fold lower. This difference remains after peptide stimulation of assembly. The inefficient assembly in T2 microsomes is not due to impaired peptide translocation across the ER membrane, as no difference was found compared with microsomes from T1 cells. Instead, the defect seems to reside in the lumen of the ER.
Mots-clé
Adenosine Triphosphate/*metabolism Biological Transport, Active/physiology Biotin/metabolism Cell Line Cell-Free System Electrophoresis, Polyacrylamide Gel Endopeptidase K Endoplasmic Reticulum/*metabolism HLA-B27 Antigen/*metabolism Humans Influenza A virus/metabolism Macromolecular Substances Microsomes/metabolism Nucleoproteins/metabolism Protein Biosynthesis/physiology Protein Processing, Post-Translational/*physiology Serine Endopeptidases/metabolism beta 2-Microglobulin/*metabolism
Pubmed
Web of science
Création de la notice
28/01/2008 11:17
Dernière modification de la notice
20/08/2019 14:10
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