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🔥 Hot Today in Peptide Research

October 20, 2026

Last updated October 20, 2026, 08:31 Israel time

Streptavidin with bound biotin shown in sticks (PDB 1STP)

6 stories were heating up that day

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Physics-based pocket design gives de novo proteins pre-organised binding sites for chromophores

Ribbon render of the de novo designed beta-barrel protein mFAP0 with the bound chromophore DFHBI in orange sticks (PDB 6CZH)

Photo: Image: BioLabs Research, rendered from PDB 6CZH (RCSB PDB, CC0) / own upload

Researchers at the University of Bristol and collaborators in Copenhagen, Sheffield and Manchester reported in Nature Communications on 19 October a rapid physics-based method for building binding pockets that match a small molecule's shape and chemistry into de novo designed proteins. Testing only single-digit numbers of designs, they obtained stable binders for several synthetic and natural chromophores, with binding sites pre-organised in X-ray structures of the ligand-free proteins and micromolar or tighter affinities. They also coupled two chromophore sites in one two-domain protein for controlled energy transfer, and made a small binder usable for imaging sub-cellular structures in cultured cells.

Nature CommunicationsResearch Buzz

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Bacterial defence systems disable phage tail fibres so that newly made virus particles cannot infect

Ribbon render of the receptor-binding tip of the bacteriophage T4 long tail fibre (PDB 2XGF)

Photo: Image: BioLabs Research, rendered from PDB 2XGF (RCSB PDB, CC0) / own upload

Researchers at Sichuan University in Chengdu reported in Nature Communications on 19 October two bacterial anti-phage systems that act directly on a viral protein. TFAD1, built around a serine protease, degrades the phage long tail fibre protein, and TFAD2, built around a serine/threonine kinase, phosphorylates it. In both cases the phage completes its replication cycle, but the progeny are not infective, a mechanism the authors call passive abortive infection to distinguish it from classical abortive infection. The study is basic microbiology research.

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SLIM ion mobility-MS workflow raises peptide identifications more than tenfold over single-shot LC-MS

Thermal ionization mass spectrometer in an analytical laboratory

Photo: Radiogenic / Wikimedia Commons (CC0) / own upload

Researchers at Pacific Northwest National Laboratory reported in the Journal of Proteome Research on 18 October fracSLIM, a proteomics workflow that pairs offline peptide fractionation with high-resolution ion mobility spectrometry-mass spectrometry built on structures for lossless ion manipulation (SLIM). Using ion-mobility separation of isomeric and isobaric species and collision cross-section values, three fractions of a HeLa cell-line digest gave more than ten times the peptide identifications of a conventional single-shot LC-MS run, with high reproducibility. The workflow also supports quantitation against heavy-isotope-labelled standards. The paper is an analytical-methods report.

Journal of Proteome ResearchResearch Buzz

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CasanovoGUI brings deep-learning de novo peptide sequencing to a point-and-click desktop app

Rack of computing servers with blue indicator displays and network cables

Photo: Derrick Coetzee from Berkeley, CA, USA / Wikimedia Commons (CC0) / own upload

Researchers at the University of Washington, the University of Michigan and the University of Antwerp reported in the Journal of Proteome Research on 19 October CasanovoGUI, an open-source Java desktop application for Casanovo, a widely used deep-learning model that reads peptide sequences directly from tandem mass spectra without a protein database. The app runs on Windows, macOS and Linux, installs a private Python environment and a GPU-matched Casanovo build on first use, streams live progress, shows annotated spectra with per-residue confidence scores and maps de novo peptides back to a reference proteome with mismatch tolerance. The code is on GitHub.

Journal of Proteome ResearchResearch Buzz

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PDBe releases SIFTS sequence-to-structure mapping as an open-source, locally deployable tool

Ribbon render of hen egg-white lysozyme in a translucent surface (PDB 1LYZ)

Photo: Image: BioLabs Research, rendered from PDB 1LYZ (RCSB PDB, CC0) / own upload

The Protein Data Bank in Europe at EMBL-EBI reported in Protein Science on 15 October PDBe-SIFTS, an open-source Python implementation of the SIFTS framework that maps UniProtKB protein sequences to Protein Data Bank structures residue by residue, previously generated only in internal pipelines. Using MMseqs2 sequence search, an improved bounded scoring scheme and refinement based on backbone connectivity, it cut archive-scale UniProtKB searches from hours with BLASTP to minutes, about 22 to 36 times faster, and recovered curated mappings at top rank in 93.1 percent of cases across the whole archive. The code is on GitHub.

Protein ScienceResearch Buzz

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Palladium-catalysed annulation converts tryptophan side chains in short peptides into phenanthridinyl indoles

Stick and ribbon render of the 20-residue Trp-cage miniprotein (PDB 1L2Y)

Photo: Image: BioLabs Research, rendered from PDB 1L2Y (RCSB PDB, CC0) / own upload

Researchers at the CSIR-Indian Institute of Chemical Technology reported in Organic Letters on 15 October a palladium-catalysed cascade that uses cyclic diaryliodonium salts to arylate the tryptophan indole at both its C2-H and N-H positions, extending the ring system into a phenanthridinyl indole. The ligand-free, operationally simple method also worked on other indole derivatives and on tryptophan-containing short peptides, giving unnatural phenanthridinyl indole-tethered peptides with good efficiency, and it tolerated N- and C-terminal protecting groups and the side chains of other amino acids. The paper is a synthetic-methods report.

Organic LettersResearch Buzz

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De novo designed cysteine proteases cut peptide bonds at chosen sequences using folds unlike natural enzymes

Ribbon render of the de novo designed cysteine protease Gawi-09 inside a translucent surface (PDB 9YOX)

Photo: Image: BioLabs Research, rendered from PDB 9YOX (RCSB PDB, CC0) / own upload

Researchers at the University of Washington's Institute for Protein Design and collaborators reported in Nature on 14 October the de novo design of enzymes that hydrolyse the peptide backbone with an activated cysteine. Of 69 designs, 13 cleaved their target sequence, with rate enhancements of up to 3 x 10^7 over the uncatalysed reaction; the designs have folds unlike natural proteases, and six crystal structures closely matched the models (PDB 9YNL, 9YNM, 9YOX, 9YOY, 9YOZ, 9YP0). The designed proteases also cleaved reporter substrates in cultured mammalian cells. The work is basic enzyme-design research.

NatureResearch

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HDOCK-Multimer combines docking and combinatorial assembly to predict structures of large protein complexes

Side-view ribbon render of the ten-subunit c-ring of yeast ATP synthase (PDB 4F4S)

Photo: Image: BioLabs Research, rendered from PDB 4F4S (RCSB PDB, CC0) / own upload

Researchers at Huazhong University of Science and Technology reported in Nature Computational Science on 14 October HDOCK-Multimer, an open framework that builds large protein assemblies from AlphaFold-predicted subcomponents using asymmetric docking, symmetric docking and genetic-algorithm-guided assembly. On 35 large heteromeric complexes it gave acceptable top-ranked models for 83 percent of targets, versus 74 percent for CombFold, and on 172 complexes of 10 to 30 chains it reached 59 percent versus 55 percent for AlphaFold3, which could not take every target because of size limits. The code is on GitHub and Zenodo.

Nature Computational ScienceResearch

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Law-firm analysis: FDA's interim peptide-compounding notice remains under White House review, text not public

High-performance liquid chromatography system on a laboratory bench

Photo: Dqwyy / Wikimedia Commons (CC0) / own upload

Law firm Buchanan Ingersoll & Rooney noted on 16 October that the White House Office of Information and Regulatory Affairs received FDA's notice 'Interim Access Policy for Compounding Using Certain Peptides' on 14 October 2026 and lists it as pending review, with no legal deadline. The analysis states that the public record does not disclose the notice's text, covered substances or conditions, that submission for review is not an operative change in FDA policy, and that an enforcement policy would not amount to FDA approval of any compounded drug; any issued policy would also have to be read alongside state pharmacy law. As of 19 October the reginfo.gov record still lists the notice as pending.

For research-community awareness only. Not legal advice.

Buchanan Ingersoll & RooneyRegulation

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Online 2D nanoLC and capillary electrophoresis-MS platform triples proteoform identifications

Photo: Radiogenic / Wikimedia Commons (CC0) / own upload

Researchers at Aalen University and Kiel University reported in Analytical Chemistry on 14 October a comprehensive online coupling of nanoflow liquid chromatography with capillary zone electrophoresis-mass spectrometry for top-down proteomics, the analysis of intact proteoforms. Placing nanoLC in front of CZE overcomes CZE's small sample loads; the automated system reached a peak capacity of about 2,200 and roughly tripled proteoform identifications in a human cell-line lysate compared with nanoLC-MS alone, and it supports isobaric-label quantitation. The paper is an analytical-methods report.

Analytical ChemistryResearch

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Four-residue peptide tag enables wash-free fluorogenic protein labelling in cultured cells

Ribbon render of the green fluorescent protein beta-barrel (PDB 1EMA)

Photo: Image: BioLabs Research, rendered from PDB 1EMA (RCSB PDB, CC0) / own upload

A team led by Peking University reported in Advanced Science on 15 October a site-selective fluorogenic labelling method built on a compact four-residue peptide tag, Phe-Cys-Pro-Phe (FCPF), paired with an environmentally sensitive sulfonyl benzoxadiazole dye. The tag can be genetically inserted at protein termini or exposed loops, and NMR analysis suggests the Phe-rich motif partly clamps the dye, boosting its fluorescence after reaction. The pair enabled wash-free imaging of proteins in several subcellular locations of cultured cells, and a FRET design improved signal-to-noise by up to 20-fold for tracking receptor conformational changes and protein-ligand interactions.

Advanced ScienceResearch

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Solid-phase synthesis route opens access to analogues of the sactipeptide enteropeptin A

Glass vacuum manifold and flasks in a chemistry fume hood

Photo: Serge Brière / Wikimedia Commons (Public domain) / own upload

Researchers at the Australian National University reported in Organic Letters on 14 October a route to analogues of enteropeptin A, a sactipeptide natural product with an unusual six-membered thiomorpholine core, that is compatible with standard solid-phase peptide synthesis. The strategy uses a readily accessible building block and efficient on-resin assembly to install a simplified sactionine motif, and a variant with the opposite, N-to-C direction of the sactionine linkage was also prepared. The authors say the approach speeds access to analogues of this natural-product class; the paper is a synthetic-methods report.

Organic LettersResearch

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