Evidence map›Paper›PMID 9348279›Full record

ArticleThe Journal of cell biology1997

The number and location of glycans on influenza hemagglutinin determine folding and association with calnexin and calreticulin.

D N Hebert, J X Zhang, W Chen, B Foellmer, A Helenius

Open access · bronzeAbstract read
In one paragraph

Article in The Journal of cell biology, 1997. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 114 papers.

0numbers the graph read from it
0cells of the map it votes in
114citing papers in PubMed
5.0field-weighted citation impact, top 4% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

114 citing papers in PubMed, 257 citations in OpenAlex.

  1. Article
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54 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 1 institution in 1 country.

D N HebertDepartment of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06520-8002, USA.
J X Zhang
W Chen
B Foellmer
A Helenius
Yale University · US

Funding

FOLDING, ASSEMBLY AND QUALITY CONTROL OF LFA-1F32DK009309 · NIDDK · YALE UNIVERSITY · PI ZHANG, JIANXIN · 1995 to 1998
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PROTEIN FOLDING IN THE ENDOPLASMIC RETICULUMR01GM038346 · NIGMS · YALE UNIVERSITY · PI HELENIUS, ARI H · 1987 to 1997
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ROLE OF N-LINKED GLYCANS AND PROTEIN FOLDINGR01GM052972 · NIGMS · YALE UNIVERSITY · PI HELENIUS, ARI H · 1995 to 1997
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NIDDK NIH HHS 1-532-DK09309NIGMS NIH HHS 1-RO1-GM52972NIGMS NIH HHS 5-RO1-GM38346
6 · The paper itself

Abstract

Calnexin and calreticulin are homologous molecular chaperones that promote proper folding, oligomeric assembly, and quality control of newly synthesized glycoproteins in the endoplasmic reticulum (ER). Both are lectins that bind to substrate glycoproteins that have monoglucosylated N-linked oligosaccharides. Their binding to newly translated influenza virus hemagglutinin (HA), and various mutants thereof, was analyzed in microsomes after in vitro translation and expression in live CHO cells. A large fraction of the HA molecules was found to occur in ternary HA- calnexin-calreticulin complexes. In contrast to calnexin, calreticulin was found to bind primarily to early folding intermediates. Analysis of HA mutants with different numbers and locations of N-linked glycans showed that although the two chaperones share the same carbohydrate specificity, they display distinct binding properties; calreticulin binding depends on the oligosaccharides in the more rapidly folding top/hinge domain of HA whereas calnexin is less discriminating. Calnexin's binding was reduced if the HA was expressed as a soluble anchor-free protein rather than membrane bound. When the co- and posttranslational folding and trimerization of glycosylation mutants was analyzed, it was observed that removal of stem domain glycans caused accelerated folding whereas removal of the top domain glycans (especially the oligosaccharide attached to Asn81) inhibited folding. In summary, the data established that individual N-linked glycans in HA have distinct roles in calnexin/calreticulin binding and in co- and posttranslational folding.

Indexed as

Protein FoldingAmino Acid SubstitutionAnimalsCalcium-Binding ProteinsCalnexinCalreticulinCHO CellsCricetinaeDogsGlycosylationHemagglutinin Glycoproteins, Influenza VirusMembrane GlycoproteinsMicrosomesMutagenesis, Site-DirectedOligosaccharidesPolysaccharidesCalcium-Binding ProteinsCalnexinCalreticulinHemagglutinin Glycoproteins, Influenza VirusMembrane GlycoproteinsOligosaccharidesPolysaccharidesRibonucleoproteins

Identifiers

PMID9348279
PMCPMC2141715
OpenAlexW2068920418

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LicenceCC BY-NC-SA
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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.