ERp44, a novel endoplasmic reticulum folding assistant of the thioredoxin family
Introduction
Results
Identification of a novel protein forming mixed disulfides with Ero1‐Lα
ERp44 contains thioredoxin‐ and calsequestrin‐like domains and a C‐terminal ER localization motif
Genomic organization and evolutionary conservation of ERp44
ERp44 transcripts are widely distributed and accumulate during the UPR
ERp44 is an ER resident protein
ERp44 binds covalently to both hEROs
ERp44 forms covalent complexes with several endogenous proteins in HeLa cells
ERp44 covalently binds both Ig‐K and Ig‐J chains, but with different kinetics
ERp44 alters the redox state of Ero1‐Lα
Discussion
ERp44, a novel member of the thioredoxin family residing in the ER
ERp44 is induced during ER stress
Functional role of ERp44
Why does ERp44 bind to hEROs?
Materials and methods
Cells and reagents
Plasmids and vectors
Transfection, immunofluorescence, pulse–chase, immunoprecipitation and western blotting
MALDI and NanoES mass spectrometry
mRNA expression, tissue distribution and UPR induction
Supplementary data
Acknowledgements
Supporting Information
References
Information & Authors
Information
Published In
Cover. The pseudo-coloured scanning electron micrograph shows the intimate contact between Neisseria gonorrhoeae (red), expressing the Opa57 adhesin, and pseudopodia extending from the surface of a HeLa cell (green) that expresses the human Opa receptor CEACAM1. Cultured cells were infected for 30 min before fixation. Volker Brinkmann, who captured this image on a LEO 1550 scanning EM, is at the microscopy core facility of the Max-Planck Institute of Infection Biology in Berlin. Oliver Billker has joined the institute as an EMBO fellow and is interested in the molecular mechanisms of host--pathogen interactions. Thomas F.Meyer is the director of the molecular biology department. For further details, see Billker et al., pages 560--571.
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