Contribution of the charged residues of hepatitis C virus glycoprotein E2 transmembrane domain to the functions of the E1E2 heterodimer.
The envelope glycoproteins of Hepatitis C virus (HCV), E1 and E2, form a heterodimer that is retained in the endoplasmic reticulum (ER). The transmembrane (TM) domains play a major role in E1E2 heterodimerization and in ER retention. Two fully conserved charged residues in the middle of the TM domain of E2 (Asp and Arg) are crucial for these functions. Replacement of the Asp residue by a Leu impaired E1E2 heterodimerization, whereas the Arg-to-Leu mutation had a milder effect. Both Asp and Arg residues were shown to contribute to the ER retention function of E2. In addition, the entry function of HCV envelope glycoproteins was affected by these mutations. Together, these data indicate that the charged residues present in the TM domain of E2 play a major role in the biogenesis and the entry function of the E1E2 heterodimer. However, the Asp and Arg residues do not contribute equally to these functions.
Ciczora
Yann
Y
CNRS-UPR2511, Unité Hépatite C, Institut de Biologie de Lille - Institut Pasteur de Lille, 1 rue Calmette, BP 447, 59021 Lille cedex, France.
Callens
Nathalie
N
CNRS-UPR2511, Unité Hépatite C, Institut de Biologie de Lille - Institut Pasteur de Lille, 1 rue Calmette, BP 447, 59021 Lille cedex, France.
Montpellier
Claire
C
CNRS-UPR2511, Unité Hépatite C, Institut de Biologie de Lille - Institut Pasteur de Lille, 1 rue Calmette, BP 447, 59021 Lille cedex, France.
Bartosch
Birke
B
Laboratoire de Vectorologie Rétrovirale et Thérapie Génique, INSERM U412, IFR74, Ecole Normale Supérieure de Lyon, Lyon, France.
Cosset
François-Loïc
FL
Laboratoire de Vectorologie Rétrovirale et Thérapie Génique, INSERM U412, IFR74, Ecole Normale Supérieure de Lyon, Lyon, France.
De Beeck
Anne Op
AO
CNRS-UPR2511, Unité Hépatite C, Institut de Biologie de Lille - Institut Pasteur de Lille, 1 rue Calmette, BP 447, 59021 Lille cedex, France.
Dubuisson
Jean
J
CNRS-UPR2511, Unité Hépatite C, Institut de Biologie de Lille - Institut Pasteur de Lille, 1 rue Calmette, BP 447, 59021 Lille cedex, France.
D002460:Cell Line; D002462:Cell Membrane / Q000737:chemistry / Q000378:metabolism*; D004721:Endoplasmic Reticulum / Q000378:metabolism; D006023:Glycoproteins / Q000737:chemistry; D016174:Hepacivirus / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D017510:Protein Folding; D017434:Protein Structure, Tertiary; D013329:Structure-Activity Relationship; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000378:metabolism*
C087035:E1 protein, Hepatitis C virus; D006023:Glycoproteins; D014759:Viral Envelope Proteins; C091015:glycoprotein E2, Hepatitis C virus