One- and two-photon photoactivation of a paGFP-fusion protein in live Drosophila embryos.
We constructed a photoactivatable Drosophila histone 2 A variant green fluorescent fusion protein (H2AvD-paGFP) for tracking chromatin loci in living Drosophila embryos. Activation of paGFP was achieved by irradiation from a single-photon diode laser at 408 nm, but activated nuclei failed to divide. Photoconversion could also be achieved by two-photon fs pulses in the range of 780-840 nm. Viability in whole-mount embryos could only be maintained at 820 nm, at which we could activate, simultaneously track and quantitate the mobility of multiple fluorescent loci. This report constitutes the first demonstration of two-photon activation of paGFP and the use of a paGFP-fusion protein in investigations of whole organisms.
Post
Janine N
JN
Department of Molecular Biology, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany. jpost@gwdg.de
Lidke
Keith A
KA
Rieger
Bernd
B
Arndt-Jovin
Donna J
DJ
D000818:Animals; D002467:Cell Nucleus / Q000737:chemistry; D002843:Chromatin / Q000737:chemistry*; D004330:Drosophila / Q000196:embryology* / Q000235:genetics*; D004625:Embryo, Nonmammalian / Q000737:chemistry / Q000166:cytology; D049452:Green Fluorescent Proteins / Q000032:analysis* / Q000235:genetics; D006657:Histones / Q000032:analysis* / Q000235:genetics; D010777:Photochemistry; D017785:Photons; D011993:Recombinant Fusion Proteins / Q000032:analysis / Q000235:genetics
D002843:Chromatin; D006657:Histones; D011993:Recombinant Fusion Proteins; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins