© The Rockefeller University Press,
0021-9525/1997//613 $5.00
The Journal of Cell Biology, Volume 139, Number 3,
, 1997 613-623
The Number and Location of Glycans on Influenza Hemagglutinin Determine Folding and Association with Calnexin and Calreticulin
Daniel N. Hebert,
Jian-Xin Zhang,
Wei Chen,
Brigitte Foellmer, and
Ari Helenius
Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06520-8002
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.
Abbreviations used in this paper: GSSG, oxidized glutathione; HA, hemagglutinin; NEM, N-ethylmaleimide; NHA, NH2-terminal peptide of HA; 2-D, two-dimensional.
We would like to acknowledge R. Gilmore (University of Massachusetts Medical Center), I. Braakman (University of Amsterdam, Amsterdam, The Netherlands), and T. Marquardt (University of Meunster, Muenster, Germany) for providing the canine pancreas microsomes and assistance with some of the glycosylation and truncation mutants, respectively. We would also like to thank N. Ayad (Yale University, New Haven, CT) and E.S. Trombetta (Yale University) for helpful discussions.
Address all correspondence to Ari Helenius, Department of Cell Biology, Yale Univeristy School of Medicine, P.O. Box 208002, New Haven, CT 06520-8002. Tel.: (203) 785-4313. Fax: (203) 737-1756. E-mail: ari_helenius @qm.yale.edu

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