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2015 ; 54
(19
): 5784-8
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Secondary-ion mass spectrometry of genetically encoded targets
#MMPMID25783034
Vreja IC
; Kabatas S
; Saka SK
; Kröhnert K
; Höschen C
; Opazo F
; Diederichsen U
; Rizzoli SO
Angew Chem Int Ed Engl
2015[May]; 54
(19
): 5784-8
PMID25783034
show ga
Secondary ion mass spectrometry (SIMS) is generally used in imaging the isotopic
composition of various materials. It is becoming increasingly popular in biology,
especially for investigations of cellular metabolism. However, individual
proteins are difficult to identify in SIMS, which limits the ability of this
technology to study individual compartments or protein complexes. We present a
method for specific protein isotopic and fluorescence labeling (SPILL), based on
a novel click reaction with isotopic probes. Using this method, we added (19)
F-enriched labels to different proteins, and visualized them by NanoSIMS and
fluorescence microscopy. The (19) F signal allowed the precise visualization of
the protein of interest, with minimal background, and enabled correlative studies
of protein distribution and cellular metabolism or composition. SPILL can be
applied to biological systems suitable for click chemistry, which include most
cell-culture systems, as well as small model organisms.