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2015 ; 12
(6
): 568-76
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High-performance probes for light and electron microscopy
#MMPMID25915120
Viswanathan S
; Williams ME
; Bloss EB
; Stasevich TJ
; Speer CM
; Nern A
; Pfeiffer BD
; Hooks BM
; Li WP
; English BP
; Tian T
; Henry GL
; Macklin JJ
; Patel R
; Gerfen CR
; Zhuang X
; Wang Y
; Rubin GM
; Looger LL
Nat Methods
2015[Jun]; 12
(6
): 568-76
PMID25915120
show ga
We describe an engineered family of highly antigenic molecules based on GFP-like
fluorescent proteins. These molecules contain numerous copies of peptide epitopes
and simultaneously bind IgG antibodies at each location. These 'spaghetti
monster' fluorescent proteins (smFPs) distributed well in neurons, notably into
small dendrites, spines and axons. smFP immunolabeling localized weakly expressed
proteins not well resolved with traditional epitope tags. By varying epitope and
scaffold, we generated a diverse family of mutually orthogonal antigens. In
cultured neurons and mouse and fly brains, smFP probes allowed robust, orthogonal
multicolor visualization of proteins, cell populations and neuropil. smFP
variants complement existing tracers and greatly increase the number of
simultaneous imaging channels, and they performed well in advanced preparations
such as array tomography, super-resolution fluorescence imaging and electron
microscopy. In living cells, the probes improved single-molecule image tracking
and increased yield for RNA-seq. These probes facilitate new experiments in
connectomics, transcriptomics and protein localization.