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Fluorescent protein pair emit intracellular FRET signal suitable for FACS screening
KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.ORCID iD: 0000-0003-0578-4003
2007 (English)In: Biochemical and Biophysical Research Communications - BBRC, ISSN 0006-291X, E-ISSN 1090-2104, Vol. 352, no 2, 449-455 p.Article in journal (Refereed) Published
Abstract [en]

The fluorescent proteins ECFP and HcRed were shown to give an easily resolved FRET-signal when expressed as a fusion inside mammalian cells. HeLa-tat cells expressing ECFP, pHcRed, or the fusion protein pHcRed-ECFP were analyzed by flow cytometry after excitation of ECFP. Cells expressing HcRed-ECFP, or ECFP and HcRed, were mixed and FACS-sorted for FRET positive cells: HcRed-ECFP cells were greatly enriched (72 times). Next, cloned human antibodies were fused with ECFP and expressed anchored to the ER membrane. Their cognate antigens (HIV-1 gp120 or gp41) were fused to HcRed and co-expressed in the ER. An increase of 13.5 +/- 1.5% (mean +/- SEM) and 8.0 +/- 10.7% in ECFP fluorescence for the specific antibodies reacting with gp 120 or gp41, respectively, was noted after photobleaching. A positive control (HcRed-ECFP) gave a 14.8 +/- 2.6% increase. Surprisingly, the unspecific antibody (anti-TT) showed 12.1 +/- 1.1% increase, possibly because overexpression in the limited ER compartment gave false FRET signals.

Place, publisher, year, edition, pages
2007. Vol. 352, no 2, 449-455 p.
Keyword [en]
FACS, membrane proteins, FRET, antibodies, HIV-1, protein-protein interactions, resonance energy-transfer, monoclonal-antibodies, mammalian-cells, expression, libraries
URN: urn:nbn:se:kth:diva-16306DOI: 10.1016/j.bbrc.2006.11.042ISI: 000243196300027ScopusID: 2-s2.0-33751529745OAI: diva2:334348
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Brismar, Hjalmar
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