How to optimize reaction conditions for cyanogen bromide protein cleavage.
...Q2: What are the recommended reaction conditions for CNBr cleavage? Optimal conditions can vary depending on the protein. However, a common starting point is to dissolve the protein in 70% formic acid or 0.1M HCl and add a 20- to 100-fold molar excess of CNBr over methionine residues.[4]...
https://pdf.benchchem.com/1212/How_to_optimize_reaction_conditions_for_cyanogen_bromide_protein_cleavage.pdf
Comprehensive Application Notes and Protocols: Cyanogen Bromide ...
...The reaction proceeds with high efficiency (typically 90-100% yield) and generates peptide fragments that are readily amenable to various downstream analytical techniques, including mass spectrometry, Edman sequencing, and chromatographic mapping....
https://pdf.smolecule.com/875/Comprehensive_Application_Notes_and_Protocols_Cyanogen_Bromide_Cleavage_of_Peptides_at_Methionine_Residues.pdf
Application Notes and Protocols for Protein Cleavage at Methionine ...
...Therefore, this document will provide comprehensive details and protocols for the highly specific and efficient cleavage of proteins at methionine residues using cyanogen bromide....
https://pdf.benchchem.com/3343/Application_Notes_and_Protocols_for_Protein_Cleavage_at_Methionine_Residues_Using_Cyanogen_Halides.pdf
Mechanism of cyanogen bromide reaction with methionine in peptides and ...
...Abstract The reaction of cyanogen bromide with peptides and proteins in anhydrous formic acid has been studied. Cleavage of the side chain of methionine to yield methyl thiocyanate was quantitative for six of the seven compounds in the study....
https://www.sciencedirect.com/science/article/pii/0003269770902599
[27] The cyanogen bromide reaction - ScienceDirect
...The highly specific action of cyanogen bromide on methionine makes possible the removal of this protecting group without side reactions. Another advantageous feature is the water solubility of acetylmethionyl peptides....
https://www.sciencedirect.com/science/chapter/bookseries/pii/S007668796711029X
Troubleshooting Guide: Cyanogen Bromide Cleavage Side Reactions
...Destruction of Methionine: The methionine residue can be consumed without cleaving the peptide bond, especially when followed by a serine or threonine. In these cases, the hydroxyl group attacks the intermediate, forming a homoserine derivative instead of the lactone [1]....
https://pdf.smolecule.com/875/Troubleshooting_Guide_Cyanogen_Bromide_Cleavage_Side_Reactions.pdf
Chemical Cleavage of Proteins at Methionyl Residues
...One of the most commonly used methods for proteolysis uses cyanogen bromide to cleave the bond to the C-terminal side of methionyl residues. The reaction is highly specific with few side reactions and a typical yield of 90-100%. It is also relatively simple and adaptable to large or small scale....
https://link.springer.com/content/pdf/10.1007/978-1-60327-259-9_63.pdf
Chemical Cleavage of Proteins at Methionyl Residues
...One of the most commonly used methods for proteolysis uses cyanogen bromide to cleave the bond to the C-terminal side of methionyl residues. The reaction is highly specific with few side reactions and a typical yield of 90?100%....
https://experiments.springernature.com/articles/10.1007/978-1-60327-259-9_63
Enhancement of cyanogen bromide cleavage yields for methionyl-serine ...
...We have explored the mechanism of the methionyl-serine and methionyl-threonine CNBr cleavage inefficiencies and have developed a simple methodology to more than double cleavage yields relative to standard literature conditions....
https://pubmed.ncbi.nlm.nih.gov/9887207/
C-Terminal Protein Characterization by Mass Spectrometry: Isolation of ...
...A sample preparation method for protein C-terminal peptide isolation from cyanogen bromide (CNBr) digests has been developed. In this strategy, the analyte was reduced and carboxyamidomethylated, followed by CNBr cleavage in a one-pot reaction scheme....
https://pmc.ncbi.nlm.nih.gov/articles/PMC3942263/