Polypeptide conjugates for intracellular delivery of nucleic acids
The present disclosure provides for polypeptide conjugates. The polypeptide conjugates disclosed herein comprise a polyarginine peptide and a cyclic cell-penetrating peptide (cCPP) conjugated, directly or indirectly, to the polyarginine peptide. The present disclosure demonstrates that cCPPs conjugated to polyarginine peptides can be used to deliver nucleic acids to the cytosol of cells.
1. A polypeptide conjugate of the formula (I):
CPP-L-[P] n -L-CPP (I):
wherein:
P comprises a polyarginine peptide (pArg) comprising at least three monomers selected from arginine or arginine-analog or a polyamine selected from a spermidine polymer or a spermine polymer;
each L independently comprises an optionally substituted —(O—CH 2 CH 2 ) z - or an optionally substituted —(CH 2 CH 2 —O) z -, wherein z is an integer from 1 to 20;
each CPP is, independently, a cyclic CPP (cCPP) comprising from 4 to 14 amino acid monomers; and
n is an integer from 1 to 50.
2. The polypeptide conjugate of claim 1 , wherein P further comprises at least one group of the formula:
3. The polypeptide conjugate of claim 1 , wherein n is 1-40.
4. The polypeptide conjugate of claim 1 , wherein n is 2-40.
5. The polypeptide conjugate of claim 1 , wherein n is 2-30.
6. The polypeptide conjugate of claim 1 , wherein n is 2-20.
7. The polypeptide conjugate of claim 1 , wherein n is 2-10.
8. The polypeptide conjugate of claim 1 , wherein each cCPP independently comprises three arginines.
9. The polypeptide conjugate of claim 8 , wherein each cCPP independently comprises at least three amino acids having a hydrophobic side chain.
10. The polypeptide conjugate of claim 1 , wherein each cCPP independently comprises the sequence:
AA H2 -AA H1 -R-r-R;
AA H2 -AA H1 -R-r-r;
AA H2 -AA H1 -r-R-R,
AA H2 -AA H1 -r-R-r;
R-R-r-AA H1 -AA H2 ;
r-R-r-AA H1 -AA H2 ;
r-r-R-AA H1 -AA H2 ; or
R-r-R-AA H1 -AA H2 ;
wherein each of AA H1 and AA H2 is independently an amino acid having a hydrophobic side chain.
11. The polypeptide conjugate of claim 1 , wherein each cCPP independently comprises the sequence:
AA H3 -AA H2 -AA H1 -R-r;
AA H3 -AA H2 -AA H1 -R-r;
AA H3 -AA H2 -AA H1 -r-R;
AA H3 -AA H2 -AA H1 -r-R;
R-r-AA H1 -AA H2 -AA H3 ;
R-r-AA H1 -AA H2 -AA H3 ;
r-R-AA H1 -AA H2 -AA H3 ; or
r-R-AA H1 -AA H2 -AA H3 ;
wherein each of AA H1 , AA H2 , and AA H3 is independently an amino acid having a hydrophobic side chain.
12. The polypeptide conjugate of claim 1 , wherein each cCPP independently comprises the sequence:
cyclo(fΦRrRrQ) or
cyclo(FfΦRrRrQ).
13. The polypeptide conjugate of claim 1 , wherein each pArg is independently:
-Cys-(Arg) x -Cys-;
-Cys-βAla(Arg) x -Cys-;
-Cys-(Arg) x -βAla-Cys-; or
-Cys-βAla(Arg) x -βAla-Cys-;
wherein x is 3, 4, 5, 6, 7, or 8.
14. The polypeptide conjugate of claim 1 , wherein each P is independently:
Cys-(polyamine) x -Cys-;
-Cys-βAla(polyamine) x -Cys-;
-Cys-(polyamine) x -βAla-Cys-;
-Cys-βAla(polyamine) x -βAla-Cys-; or
-S-(polyamine) x -S-
wherein x is 3, 4, 5, 6, 7, or 8.
15. The polypeptide conjugate of claim 1 , wherein [pArg] n is:
or a charged species thereof.
16. The polypeptide conjugate of claim 1 , wherein the polypeptide has the structure:
or a charged species thereof, or
or a charged species thereof.
17. The polypeptide conjugate of claim 1 , wherein the polypeptide has the structure:
or a charged species thereof, or
or a charge species thereof.
18. A complex comprising the polypeptide conjugate of claim 1 and at least one nucleic acid sequence.
19. A method of delivering a nucleic acid sequence to a cell of a subject in need thereof, comprising administering the complex of claim 18 .
20. A method of treating a disease or condition in a patient in need thereof, comprising administering the complex of claim 18 to the patient.