Method of changing fluorescence wavelength of fluorescent protein
View Patent ↗The present invention provides: a method of changing the fluorescence wavelength of a GFP-like fluorescent protein from copepod while maintaining recombinant expression efficiency, which comprises identifying a structural factor for determining the fluorescence wavelength thereof in the three-dimensional structure of the protein and modifying amino acid residues associated with the structural factor; and a modified fluorescent protein obtained by applying said method. For example, with regard to a GFP-like fluorescent protein from Chiridius poppei , His 52 in an α helix-like secondary structure: PFLLS H CM GYG FYHF (α 1 47-61) comprising a fluorescent moiety site GYG is replaced with an aromatic amino acid selected from Phe, Tyr and Trp, so as to cause a red shift of the fluorescent peak wavelength; or it is replaced with Ala, Val, Ile, Leu, Gly, Cys, Met, Ser, Thr, or Asp, Asn, Glu or Gln, so as to cause a blue shift of the fluorescence peak wavelength.
1. A modified fluorescent protein of a GFP-like fluorescent protein from Chiridius poppei: Chiridius poppei yellowish-green fluorescent protein (CpYGFP),
which is characterized in that it is any one of:
a modified fluorescent protein comprising a full amino acid sequence wherein histidine (His) at the 52nd amino acid position is replaced with one amino acid selected from the aromatic amino acid group consisting of phenylalanine (Phe), tyrosine (Tyr) and tryptophan (Trp) in the full-length amino acid sequence (SEQ ID NO: 1) of the CpYGFP:
MTTFKIESRI HGNLNGEKFE LVGGGVGEEG RLEIEMKTKD
60
KPLAFSPFLL SHCMGYGFYH
FASFPKGTKN IYLHAATNGG YTNTRKEIYE DGGILEVNFR
120
YTYEFNKIIG DVECIGHGFP
SQSPIFKDTI VKSCPTVDLM LPMSGNIIAS SYARAFQLKD
180
GSFYTAEVKN NIDFKNPIHE
SFSKSGPMFT HRRVEETHTK ENLAMVEYQQ VFNSAPRDM
219
and exhibiting a red shifted fluorescence peak wavelength, when compared with the fluorescence peak wavelength of the CpYGFP;
a modified fluorescent protein comprising a full amino acid sequence wherein the His at the 52nd amino acid position in the full-length amino acid sequence of the CpYGFP is replaced with one amino acid selected from the amino acid group consisting of alanine (Ala), valine (Val), isoleucine (Ile), leucine (Leu), glycine (Gly), cysteine (Cys), methionine (Met), serine (Ser) and threonine (Thr), and exhibiting a blue shifted fluorescence peak wavelength, when compared with the fluorescence peak wavelength of the CpYGFP; and
a modified fluorescence protein comprising a full amino acid sequence wherein the His at the 52nd amino acid position in the full-length amino acid sequence of the CpYGFP is replaced with one amino acid selected from the amino acid group consisting of aspartic acid (Asp), asparagine (Asn), glutamic acid (Glu) and glutamine (Gln), and exhibiting a blue shifted fluorescence peak wavelength, when compared with the fluorescence peak wavelength of the CpYGFP.
2. The modified fluorescent protein as claimed in claim 1 , which is characterized in that it is a modified fluorescent protein CpYGFP-H52F comprising a full amino acid sequence wherein the His at the 52nd amino acid position in the full-length amino acid (SEQ ID NO: 1) of the CpYGFP is replaced with Phe, and exhibiting a red shifted fluorescence peak wavelength, when compared with the fluorescence peak wavelength of the CpYGFP.
3. The modified fluorescent protein as claimed in claim 1 , which is characterized in that it is a modified fluorescent protein CpYGFP-H52T comprising a full amino acid sequence wherein the His at the 52nd amino acid position in the full-length amino acid sequence (SEQ ID NO: 1) of the CpYGFP is replaced with Thr, and exhibiting a blue shifted fluorescence peak wavelength, when compared with the fluorescence peak wavelength of the CpYGFP.
4. The modified fluorescent protein according to claim 1 , which is characterized in that it is a modified fluorescent protein CpYGFP-H52D comprising a full amino acid sequence wherein the His at the 52nd amino acid position in the full-length amino acid sequence (SEQ ID NO: 1) of the CpYGFP is replaced with Asp, and exhibiting a blue shifted fluorescence peak wavelength, when compared with the fluorescence peak wavelength of the CpYGFP.
5. A modified fluorescent protein of a GFP-like fluorescent protein from Chiridius poppei: Chiridius poppei yellowish-green fluorescent protein (CpYGFP),
which is characterized in that it is any one of:
a modified fluorescent protein CpYGFP-Y56W comprising a full amino acid sequence wherein tyrosine (Tyr) at the 56th amino acid position is replaced with tryptophan (Trp) in the full-length amino acid sequence (SEQ ID NO: 1) of the CpYGFP:
MTTFKIESRI HGNLNGEKFE LVGGGVGEEG RLEIEMKTKD
60
KPLAFSPFLL SHCMGYGFYH
FASFPKGTKN IYLHAATNGG YTNTRKEIYE DGGILEVNFR
120
YTYEFNKIIG DVECIGHGFP
SQSPIFKDTI VKSCPTVDLM LPMSGNIIAS SYARAFQLKD
180
GSFYTAEVKN NIDFKNPIHE
SFSKSGPMFT HRRVEETHTK ENLAMVEYQQ VFNSAPRDM
219
and exhibiting a blue shifted fluorescence peak wavelength of 460 nm or shorter, when compared with the fluorescence peak wavelength of the CpYGFP;
a modified fluorescent protein CpYGFP-Y56W, V194S comprising a full amino acid sequence wherein the Tyr at the 56th amino acid position is replaced with Trp, and valine (Val) at the 194th amino acid position is further replaced with serine (Ser) in the full-length amino acid sequence of the CpYGFP, and exhibiting a blue shifted fluorescence peak wavelength of 460 nm or shorter, when compared with the fluorescence peak wavelength of the CpYGFP; and
a modified fluorescence protein CpYGFP-Y56W, V194S, T136A comprising a full amino acid sequence wherein the amino acid at position 56 Tyr is replaced with Trp, the Val at the 194th amino acid position is replaced with Ser, and threonine (Thr) at the 136th amino acid position is further replaced with alanine (Ala) in the full-length amino acid sequence of the CpYGFP, and exhibiting a blue shifted fluorescence peak wavelength of 460 nm or shorter, when compared with the fluorescence peak wavelength of the CpYGFP.