IP Library › Granted Patent US 12,391,939
Granted Patent B2
US 12,391,939 · App. 17/261,390 · Granted Aug 19, 2025

Genetically-encoded bicyclic peptide libraries

Inventors: Ratmir Derda (Edmonton, CA); Raja Mukherjee (Edmonton, CA); Vivian Triana (Edmonton, CA)
C12N15/1037C40B40/10
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Quick Facts
Patent No.
US 12,391,939
App. No.
17/261,390
Granted
Aug 19, 2025
Kind
B2
Abstract

The invention relates to a bicyclic peptide complex comprising a peptide construct, said construct comprising (i) a polypeptide with free terminus (N or C); (ii) optionally, a nucleic acid encoding the polypeptide; (iii) a twofold-symmetric linker (TSL) compound attached to said polypeptide where the linker is attached to the terminus of polypeptide via a covalent bond and to at least two discrete side chains of the peptide. The invention also relates to libraries, and to methods for making complexes and to methods of screening using the same.

Claims (16)

1. A genetically-encoded peptide construct comprising a bicyclic structure comprising a two-fold symmetric linker having a first end and a second end comprising two reactive groups attached to a genetically encoded polypeptide, wherein the first end is ligated to a terminus of the polypeptide by a covalent bond, and wherein both reactive groups of the linker second end are each ligated to side chain residues of the polypeptide by a covalent bond, wherein the linker comprises an aliphatic chain having between 1-6 carbon atoms, wherein the polypeptide consists of unprotected, natural proteogenic amino acids, and does not comprise a free N-terminus.

2. The construct of claim 1 wherein the linker further comprises an ester, a phenyl, or an amine group.

3. The construct of claim 1 wherein the polypeptide terminus is an N-terminus and the side chain residues are cysteine, lysine or tyrosine.

4. The construct of claim 1 wherein the linker reactive groups are electrophilic groups reactive to thiol, amine or phenol.

5. The construct of claim 1 wherein the linker first end comprises an aldehyde reactive group comprising an oxime, hydrazine, 2-amino benzamidoxime, phosphonium ylide, sulphur ylide, nitrogen ylide or any other carbon nucleophile and carbenoid reagent known to be reactive with aldehydes and stable in aqueous environment.

6. The construct of claim 1 wherein the polypeptide comprises two cysteine residues and an N-terminal serine or threonine residue, wherein the N-terminal serine or threonine is first converted to an aldehyde by selective oxidation and wherein the second end reactive groups are covalently bonded to the cysteine residues.

7. The construct of claim 1 which is attached to a carrier comprising a phage particle bearing the polypeptide externally and including a nucleic acid encoding the polypeptide.

8. The construct of claim 1 which is a RNA display compound, said RNA display bearing the polypeptide; and including an RNA sequence encoding the polypeptide, and linked to the polypeptide.

9. The construct of claim 1 which is a DNA display compound, said DNA display bearing the polypeptide; and including a DNA encoding the polypeptide, linked to the polypeptide.

10. The construct of claim 1 wherein the polypeptide terminus is a C-terminus and the side chain residues are cysteine or lysine, and wherein the linker first end comprises a reactive group with reactivity to C-terminus in acidic pH and the linker second end comprises two electrophilic groups that react specifically with thiol or amine residues.

11. The construct of claim 10 wherein the reactive group with reactivity to C-terminus in acidic pH is a C-terminal-selective photoredoxdecarboxylative conjugate addition.

12. The construct of claim 10 wherein the linker electrophilic groups are groups reactive with thiol in water comprising haloketone, haloacetamide, halobenzyl, a Michael acceptor comprising a conjugated C═C double bond including maleimides, actylates, carbonylacrylic reagents, 3-arylpropiolonitriles, allenamides fluoroarene, chlorotetrazines, Julia-Kocienśki-like reagents, 2-azidoacrylates, organometallic palladium reagents, organo gold (I) reagents, conversion of thiols to dehydroalanines (Dha) followed by conjugate addition to Dha.

13. The construct of claim 10 wherein the linker electrophilic groups are groups reactive with amine in water comprising N-hydroxysuccinimide esters, aryl esters, perfluoroaryl esters, perfluoroarenes, ketenes, ortho-phthalaldehydes, or strain-release amine modifying agents.

14. The construct of claim 10 wherein the linker electrophilic groups are groups reactive with phenol in water comprising allylpaladium, diazodicarboxylate, diazonium salts, aniline-formaldehyde hemiaminal, rhodium carbenoids, dirhodium metallopeptide catalysts, Manganese-Catalyzed C—H Alkynylation, Waser's reagent, 1-[(triisopropylsilyl)ethynyl]-1,2-benziodoxol-3(1 H)-one (TIPS-EBX), under gold (I) catalysis, selective ruthenium-(II)-catalyzed C—H activation, palladium (II) acetate catalyzed C—H activation with aryl iodides in water.

15. The construct of claim 1 wherein the polypeptide comprises a terminal serine residue and two cysteine residues separated by at least 2, 3, 4 or 5 amino acid residues.

16. The construct of claim 2 wherein the linker comprises one of:

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 30, 2024
From: THE GOVERNORS OF THE UNIVERSITY OF ALBERTA
To: 48HOUR DISCOVERY INC.
Reel/Frame 067271/0487 →
Continuity (2)
Provisional Application 62702284 · Jul 23, 2018
Related Publication 20210340525A1 · Nov 4, 2021
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