Dataset Information

A simple method for developing lysine targeted covalent protein reagents

ABSTRACT: In this project we developed phosphopeptides functionalized with methacrylate ester warheads installed on a cysteine residue, which bind covalently to the protein 14-3-3 sigma. We prepared complexes of the purified protein with the peptides and used trypsin digestion and LC-MSMS to elucidate the binding site of the peptides, by comparison of compound-treated complexes to DMSO-treated protein and observing the disappearance on non-modified peptides. The file names are based on internal names used for the project and are distinct from the names given to the peptides in the final publication. Names are as follows: 4IEA - peptide 3 in the final publication 128C - peptide 8 in the final publication 132C - peptide 11 in the final publication

INSTRUMENT(S): LTQ Orbitrap

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Ronen Gabizon

LAB HEAD: Nir London

PROVIDER: PXD044257 | Pride | 2024-01-26

REPOSITORIES: Pride

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A simple method for developing lysine targeted covalent protein reagents.

Gabizon Ronen R Tivon Barr B Reddi Rambabu N RN van den Oetelaar Maxime C M MCM Amartely Hadar H Cossar Peter J PJ Ottmann Christian C London Nir N

Nature communications 20231201 1

Peptide-based covalent probes can target shallow protein surfaces not typically addressable using small molecules, yet there is a need for versatile approaches to convert native peptide sequences into covalent binders that can target a broad range of residues. Here we report protein-based thio-methacrylate esters-electrophiles that can be installed easily on unprotected peptides and proteins via cysteine side chains, and react efficiently and selectively with cysteine and lysine side chains on t ...[more]

PMID: 38040731

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Project description:Proteomics, the temporal study of proteins expressed by an organism, is a powerful technique that can reveal how organisms respond to biological perturbations, such as disease and environmental stress. Yet, the use of proteomics for addressing ecological questions has been limited, partly due to inadequate protocols for the sampling and preparation of animal tissues from the field. Although RNAlater is an ideal alternative to freezing for tissue preservation in transcriptomics studies, its suitability for the field could be more broadly examined. Moreover, existing protocols require samples to be preserved immediately to maintain protein integrity, yet the effects of delays in preservation on proteomic analyses have not been thoroughly tested. Hence, we optimised a proteomic workflow for wild-caught samples. First, we conducted a preliminary in-lab test using SDS-PAGE analysis on aquaria-reared Octopus berrima confirming that RNAlater can effectively preserve proteins up to 6 h after incubation, supporting its use in the field. Subsequently, we collected arm tips from wild-caught Octopus berrima and preserved them in homemade RNAlater immediately, 3 h, and 6 h after euthanasia. Processed tissue samples were analysed by liquid chromatography tandem mass spectrometry to ascertain protein differences between time delay in tissue preservation, as well as the influence of sex, tissue type, and tissue homogenisation methods. Over 3500 proteins were identified from all tissues, with bioinformatic analysis revealing protein abundances were largely consistent regardless of sample treatment. However, nearly 10 % additional proteins were detected from tissues homogenised with metal beads compared to liquid nitrogen methods, indicating the beads were more efficient at extracting proteins. Our optimised workflow demonstrates that sampling non-model organisms from remote field sites is achievable and can facilitate extensive proteomic coverage without compromising protein integrity.

Dataset Information

A simple method for developing lysine targeted covalent protein reagents

Publications

A simple method for developing lysine targeted covalent protein reagents.

Similar Datasets

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