Abstract
The hemagglutinin-neuraminidase (HN) and fusion (F) glycoproteins of the paramyxovirus simian virus 5 (SV5) are expressed on the surface of virus-infected cells. Although the F protein was found to be expressed stably, the HN protein was internalized from the plasma membrane. HN protein lacks known internalization signals in its cytoplasmic domain that are common to many integral membrane proteins that are internalized via clathrin-coated pits. Thus, the cellular pathway of HN protein internalization was examined. Biochemical analysis indicated that HN was lost from the cell surface with a t1/2 of approximately 45-50 min and turned over with a t1/2 of approximately 2 h. Immunofluorescent analysis showed internalized SV5 HN in vesicle-like structures in a juxtanuclear pattern coincident with the localization of ovalbumin. In contrast the SV5 F glycoprotein and the HN glycoprotein of the highly related parainfluenza virus 3 (hPIV-3) were found only on the cell surface. Immunogold staining of HN on the surface of SV5-infected CV-1 cells and examination using electron microscopy, showed heavy surface labeling that gradually decreased with time. Concomitantly, gold particles were detected in the endosomal system and with increasing time, gold-labeled structures having the morphology of lysosomes were observed. On the plasma membrane approximately 5% of the gold-labeled HN was found in coated pits. The inhibition of the pinching-off of coated pits from the plasma membrane by cytosol acidification significantly reduced HN internalization. Internalized HN was co-localized with gold-conjugated transferrin, a marker for the early endosomal compartments, and with gold-conjugated bovine serum albumin, a marker for late endosomal compartments. Taken together, these data strongly suggest that the HN glycoprotein is internalized via clathrin-coated pits and delivered to the endocytic pathway.
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Selected References
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