Folding latency of fluorescent proteins affects the mitochondrial localization of fusion proteins
biorxiv(2019)
摘要
The discovery of fluorescent proteins (FPs) has revolutionized cell biology. The fusion of targeting sequences to FPs enables the investigation of cellular organelles and their dynamics; however, occasionally, such fluorescent fusion proteins (FFPs) exhibit behavior different from that of the native proteins. Here, we constructed a color pallet comprising different organelle markers and found that FFPs targeted to the mitochondria were mislocalized when fused to certain types of FPs. Such FPs included several variants of Aequorea victoria green FP (aqGFP) and a monomeric variant of the red FP. Because the FFPs that are mislocalized include FPs with faster maturing or folding mutations, the increase in the maturation rate is likely to prevent their expected localization. Indeed, when we reintroduced amino acid substitutions so that the FP sequences were equivalent to that of wild-type aqGFP, FFP localization to the mitochondria was significantly enhanced. Moreover, similar amino acid substitutions improved the localization of mitochondria-targeted pHluorin, which is a pH-sensitive variant of GFP, and its capability to monitor pH changes in the mitochondrial matrix. Our findings demonstrate the importance of selecting FPs that maximize FFP function.
* aq
: Aequorea victoria
Ds
: Discosoma sea anemones
EEA1
: early endosomal antigen 1
ER
: endoplasmic reticulum
FCCP
: p-trifluoromethoxyphenylhydrazone
FFP
: fluorescent fusion proteins
FP
: fluorescent proteins
FRET
: Förster resonance energy transfer
GalT
: β1,4-galactose transferase
GFP
: green fluorescent protein
H2B
: histone 2B
KRasCT
: C-terminal hypervariable region of K-Ras 4B
RFPized
: red fluorescence-proteinized
sfGFP
: superfolder GFP
TOM
: translocase of outer membrane
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