Back to Search
Start Over
Low Copy Numbers of DC-SIGN in Cell Membrane Microdomains: Implications for Structure and Function.
- Source :
-
Traffic . Feb2014, Vol. 15 Issue 2, p179-196. 18p. - Publication Year :
- 2014
-
Abstract
- Presently, there are few estimates of the number of molecules occupying membrane domains. Using a total internal reflection fluorescence microscopy ( TIRFM) imaging approach, based on comparing the intensities of fluorescently labeled microdomains with those of single fluorophores, we measured the occupancy of DC-SIGN, a C-type lectin, in membrane microdomains. DC-SIGN or its mutants were labeled with primary monoclonal antibodies ( mAbs) in either dendritic cells ( DCs) or NIH3T3 cells, or expressed as GFP fusions in NIH3T3 cells. The number of DC-SIGN molecules per microdomain ranges from only a few to over 20, while microdomain dimensions range from the diffraction limit to > 1 µm. The largest fraction of microdomains, appearing at the diffraction limit, in either immature DCs or 3 T3 cells contains only 4-8 molecules of DC-SIGN, consistent with our preliminary super-resolution Blink microscopy estimates. We further show that these small assemblies are sufficient to bind and efficiently internalize a small (∼50 nm) pathogen, dengue virus, leading to infection of host cells. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13989219
- Volume :
- 15
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Traffic
- Publication Type :
- Academic Journal
- Accession number :
- 93678795
- Full Text :
- https://doi.org/10.1111/tra.12138