scholarly journals Synthesis and properties of the very-low-density-lipoprotein receptor and a comparison with the low-density-lipoprotein receptor

1997 ◽  
Vol 324 (2) ◽  
pp. 371-377 ◽  
Author(s):  
Dilip D. PATEL ◽  
Robert A. FORDER ◽  
Anne K. SOUTAR ◽  
Brian L. KNIGHT
Keyword(s):  
Cho Cells ◽  
Low Density Lipoprotein ◽  
Ldl Receptor ◽  
Density Lipoprotein ◽  
Very Low Density Lipoprotein ◽  
Low Density ◽  
Lipoprotein Receptor ◽  
Low Density Lipoprotein Receptor ◽  
Vldl Receptor ◽  
Density Lipoprotein Receptor

The properties of the very-low-density lipoprotein (VLDL) receptor have been studied in Chinese hamster ovary (CHO) cells stably transfected with human VLDL-receptor cDNA and compared with those of the low-density lipoprotein (LDL) receptor expressed under the same conditions. Immunoblotting showed that the cells produced a mature VLDL receptor protein, of apparent Mr 123000 on non-reduced and 158000 on reduced gels, that was less extensively glycosylated than the LDL receptor. The VLDL receptor was more slowly processed than the LDL receptor, with only approx. 70% of the precursor being converted into the mature protein. Nevertheless, the majority of the receptor in the cells was in the mature form, and most of this was present on the cell surface. The human VLDL receptor bound rabbit very-low-density lipoprotein with β electrophoretic mobility (βVLDL), but not human LDL, and uptake through the receptor led to stimulation of oleate incorporation into cholesteryl esters. At 37 °C, the characteristics of VLDL-receptor-mediated uptake and degradation of βVLDL were essentially the same as those mediated by the LDL receptor. However, the VLDL receptor apparently did not show the increase in affinity and decrease in binding of βVLDL on cooling to 4 °C that was exhibited by the LDL receptor. Thus the overexpressed VLDL receptor in CHO cells appears to behave as a lipoprotein receptor with similar, but not identical, properties to the LDL receptor.

Effect of overexpression of very low density lipoprotein receptor on cell growth

2000 ◽  
Vol 15 (2) ◽  
pp. 74-80 ◽  
Author(s):  
Yoko Wada ◽  
Yoshimi Homma ◽  
Kazuhiko Nakazato ◽  
Toshiyuki Ishibashi ◽  
Y. Maruyama
Keyword(s):  
Cell Growth ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Very Low Density Lipoprotein ◽  
Low Density ◽  
Lipoprotein Receptor ◽  
Low Density Lipoprotein Receptor ◽  
Density Lipoprotein Receptor

scholarly journals Very-Low-Density Lipoprotein Receptor Fragment Shed from HeLa Cells Inhibits Human Rhinovirus Infection

1998 ◽  
Vol 72 (12) ◽  
pp. 10246-10250 ◽  
Author(s):  
Thomas C. Marlovits ◽  
Christina Abrahamsberg ◽  
Dieter Blaas
Keyword(s):  
Hela Cells ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Intercellular Adhesion Molecule ◽  
Very Low Density Lipoprotein ◽  
Low Density ◽  
Lipoprotein Receptor ◽  
Dependent Manner ◽  
Low Density Lipoprotein Receptor ◽  
Density Lipoprotein Receptor

ABSTRACT The large family of human rhinoviruses, the main causative agents of the common cold, is divided into the major and the minor group based on receptor specificity. Major group viruses attach to intercellular adhesion molecule 1 (ICAM-1), a member of the immunoglobulin superfamily, whereas minor group viruses use low-density lipoprotein receptors (LDLR) for cell entry. During early attempts aimed at isolating the minor group receptor, we discovered that a protein with virus binding activity was released from HeLa cells upon incubation with buffer at 37°C (F. Hofer, B. Berger, M. Gruenberger, H. Machat, R. Dernick, U. Tessmer, E. Kuechler, and D. Blaas, J. Gen. Virol. 73:627–632, 1992). In light of the recent discovery of several new members of the LDLR family, we reinvestigated the nature of this protein and present evidence for its being derived from the human very-low density lipoprotein receptor (VLDLR). A soluble VLDLR fragment encompassing the eight complement type repeats and representing the N-terminal part of the receptor was then expressed in the baculovirus system; both the shed protein and the recombinant soluble VLDLR bind minor group viruses and inhibit viral infection of HeLa cells in a concentration-dependent manner.

scholarly journals A Cellular Receptor of Human Rhinovirus Type 2, the Very-Low-Density Lipoprotein Receptor, Binds to Two Neighboring Proteins of the Viral Capsid

2003 ◽  
Vol 77 (15) ◽  
pp. 8504-8511 ◽  
Author(s):  
Emmanuelle Neumann ◽  
Rosita Moser ◽  
Luc Snyers ◽  
Dieter Blaas ◽  
Elizabeth A. Hewat
Keyword(s):  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Very Low Density Lipoprotein ◽  
Low Density ◽  
Lipoprotein Receptor ◽  
Low Density Lipoprotein Receptor ◽  
The North ◽  
Density Lipoprotein Receptor ◽  
The Individual ◽  
Viral Protein 1

ABSTRACT The very-low-density lipoprotein receptor (VLDL-R) is a receptor for the minor-group human rhinoviruses (HRVs). Only two of the eight binding repeats of the VLDL-R bind to HRV2, and their footprints describe an annulus on the dome at each fivefold axis. By studying the complex formed between a selection of soluble fragments of the VLDL-R and HRV2, we demonstrate that it is the second and third repeats that bind. We also show that artificial concatemers of the same repeat can bind to HRV2 with the same footprint as that for the native receptor. In a 16-Å-resolution cryoelectron microscopy map of HRV2 in complex with the VLDL-R, the individual repeats are defined. The third repeat is strongly bound to charged and polar residues of the HI and BC loops of viral protein 1 (VP1), while the second repeat is more weakly bound to the neighboring VP1. The footprint of the strongly bound third repeat extends down the north side of the canyon. Since the receptor molecule can bind to two adjacent copies of VP1, we suggest that the bound receptor “staples” the VP1s together and must be detached before release of the RNA can occur. When the receptor is bound to neighboring sites on HRV2, steric hindrance prevents binding of the second repeat.

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