Receptor chimeras demonstrate that the C-terminal domain of the human cytomegalovirus US27 gene product is necessary and sufficient for intracellular receptor localization
| العنوان: | Receptor chimeras demonstrate that the C-terminal domain of the human cytomegalovirus US27 gene product is necessary and sufficient for intracellular receptor localization |
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| المؤلفون: | Kathleen L. Arnolds, Juliet V. Spencer, Tori M Devito, Angela P. Lares, Lance K. Stapleton |
| المصدر: | Virology Journal, Vol 9, Iss 1, p 42 (2012) Virology Journal |
| بيانات النشر: | BMC, 2012. |
| سنة النشر: | 2012 |
| مصطلحات موضوعية: | Receptors, CXCR3, Virulence Factors, Endosome, Molecular Sequence Data, Cytomegalovirus, Biology, Cell Line, lcsh:Infectious and parasitic diseases, Viral Proteins, 03 medical and health sciences, Chemokine receptor, Cytosol, GPCR, Virology, US27, Intracellular receptor, Humans, lcsh:RC109-216, Amino Acid Sequence, Receptor, HCMV, Sequence Deletion, 030304 developmental biology, G protein-coupled receptor, Recombination, Genetic, 0303 health sciences, Research, Chemokine receptors, 030302 biochemistry & molecular biology, Wild type, Molecular biology, 3. Good health, Protein Transport, Infectious Diseases, Microscopy, Fluorescence, Viral Receptor, Mutant Proteins, Receptors, Chemokine, Chemokines, Intracellular |
| الوصف: | Background Human cytomegalovirus (HCMV) is ubiquitous in the population but generally causes only mild or asymptomatic infection except in immune suppressed individuals. HCMV employs numerous strategies for manipulating infected cells, including mimicry of G-protein coupled receptors (GPCRs). The HCMV US27 gene product is a putative GPCR, yet no ligand or signaling has been identified for this receptor. In the present study, immunofluorescence microscopy was used to examine the cellular distribution of wild type US27, as well as US27 deletion mutants and chimeric receptors. Results In transiently transfected cells, wild type US27 was found primarily in intracellular compartments, in striking contrast to the cell surface distribution seen for the human cellular chemokine receptor CXCR3. When the N-terminal extracellular domains of the two receptors were swapped, no change in protein localization was observed. However, swapping of the C-terminal intracellular domains resulted in a significant change in receptor distribution. A chimera that contained US27 fused to the C-terminal intracellular tail of CXCR3 exhibited surface distribution similar to that of wild-type CXCR3. When the C-terminal domain of US27 was fused to CXCR3, this chimeric receptor (CXCR3/US27-CT) was found in the same intracellular pattern as wild-type US27. In addition, a US27 mutant lacking the C-terminus (US27ΔCT) failed to accumulate inside the cell and exhibited cell surface distribution. Co-localization with organelle-specific markers revealed that wild-type US27 was found predominantly in the Golgi apparatus and in endosomal compartments, whereas the US27/CXCR3-CT chimera, US27ΔCT and US27Δ348 mutants were not localized to endosomal compartments. Conclusions The results indicate that the C-terminal domain of the HCMV US27 protein, which contains a di-leucine endocytic sorting motif, is both necessary and sufficient for intracellular localization, which may also help explain why no cellular ligands have yet been identified for this viral receptor. |
| اللغة: | English |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab6550c8b8a1ecc9d5820e4578c7f95eTest http://www.virologyj.com/content/9/1/42Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....ab6550c8b8a1ecc9d5820e4578c7f95e |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |