23FQ | pdb_000023fq

Dipeptide removal from MccJ25 yields a new lasso peptide delta-VG

• PDB DOI: https://doi.org/10.2210/pdb23FQ/pdb

• Classification: DE NOVO PROTEIN
• Organism(s): Escherichia coli
• Mutation(s): No 


• Deposited: 2026-02-05 Released: 2026-09-09 
• Deposition Author(s): Tsai, C.-Y., Huang, Y.-P., Chang, C.-F., Chu, C.-H.
• Funding Organization(s): Other government

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 20 
• Selection Criteria: all calculated structures submitted 

Literature

Chemoenzymatic Modification of Microcin J25 with Single-Residue Precision Provides New-to-Nature Lasso Peptides.

Tsai, C.Y., Chung, H.W., Huang, Y.P., Chang, C.F., Cheung, K.Y., Tan, H.N., Huang, H.Y., Sung, L.K., Hegemann, J.D., Chan, Y.T., Chu, J.

(2026) JACS Au 6: 4618-4625

• PubMed: 42657259 
• DOI: https://doi.org/10.1021/jacsau.6c00700
• Primary Citation Related Structures: 
  23FQ


• PubMed Abstract: 
  

  Reported herein is a new approach for constructing mechanically interlocked molecules based on the lasso peptide microcin J25 (MccJ25). Our approach began with site-selective proteolysis in the loop region of MccJ25, in which thermolysin hydrolyzed one or two specific amide bonds to create an incision or an excision, respectively, while preserving the macrolactam ring and the threaded architecture. Subsequent amide bond reformation, promoted by a peptide coupling reagent, resealed the incision and restored the lasso structure. We then added another level of complexity by incorporating diverse molecular building blocks into the proteolytically digested MccJ25 scaffold. Using this chemoenzymatic workflow, a series of new-to-nature lasso peptides was prepared. Specifically, we increased or decreased the size of the loop, incorporated noncanonical amino acids (AAs)including d-form and N-methylated AAsand even installed a bulky naphthalene moiety. This workflow opens new opportunities for developing functional materials for biomedical applications based on a lasso peptide scaffold.

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Organizational Affiliation: 
• Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan.
Genomics Research Center, Academia Sinica, Taipei 115201, Taiwan.
Institute of Pharmaceutical Biology, Technische Universität Braunschweig, Braunschweig 38106, Germany.
Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Braunschweig 38106, Germany.
Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan.
Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: NMR Distance Restraints

Macromolecule Content 

• Total Structure Weight: 1.97 kDa 
• Atom Count: 139 
• Modeled Residue Count: 19 
• Deposited Residue Count: 19 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Microcin J25	A	19	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for Q9X2V7 (Escherichia coli) Explore Q9X2V7  Go to UniProtKB:  Q9X2V7

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 20 
• Selection Criteria: all calculated structures submitted 

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-09-09 
Deposition Author(s): Tsai, C.-Y., Huang, Y.-P., Chang, C.-F., Chu, C.-H.

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Funding Organization	Location	Grant Number
Other government	Taiwan	112-2113-M-002-005
Other government	Taiwan	112-2923-M- 002-005-MY3
Other government	Taiwan	111-214

Revision History  

• Version 1.0: 2026-09-09
  Type: Initial release