Carbamylation is an irreversible process of non-enzymatic modification of proteins by the breakdown products of urea isocyanic acid reacts with the N-term of a proteine or side chains of lysine and arginine residues Cyanogen bromide (CNBr) cleavage converts the C-term Met to either homoserine or homoserine lactone, depending on pH. Cyanogen bromide (CNBr) cleavage converts the C-term Met to either homoserine or homoserine lactone, depending on pH. Protein which is posttranslationally modified by the attachment of at least one phosphate group usually on serine, threonine or tyrosine residues, but also on aspartic acid or histidine residues. Cyclisation of N-term Carbamidomethyl-Cys or Carboxymethyl-Cys. The delta is relative to Cys. For a delta relative to alkylated Cys, see Ammonia-loss and Dehydrated. Proton replaced by sodium cation This group is normally a substituent on N6 of a lysine residue of an enzyme or other protein The amine derivative of a hexose formed by replacing a hydroxyl group with an amino group.(+acetyl group) The co-enzyme derivative of vitamin B6. Forms Schiff\'s bases of substrate amino acids during catalysis of transamination, decarboxylation and racemisation reactions. Palmitoylation is a post-translational modification that consists in the addition of a 16 carbons fatty acid, palmitate, to a cysteine residue through the creation of a thioester link. Protein which contains at least one phosphopantetheine as the prosthetic group. In acyl carrier proteins (ACP) for example, it serves as a \'swinging arm\' for the attachment of activated fatty acid and amino-acid groups. Specific for sidechain of lysine. Does not modify the N-termini except for glycine at a slower rate than the side chain of lysine. A lipid-type modification. HNE forms a Michael addition product on Cysteine, Histidine and Lysines. Unusually, it doesn\'t replace a hydrogen on the amino acid side chain. The addition of a sugar unit to a protein amino acid, e.g. the addition of glycan chains to proteins. Addition of glucuronic acid. Observed for N-term G Reduction of Schiff base formed between K amino group and acetaldehyde Lys modification is formation of Schiff base. The two glycine residues left on ubiquitinylated lysine after tryptic digestion Reduced product of reaction with 3,3-Dithio-bis-(sulfosuccinimidyl)propionate. Note that name thioacyl is misleading and subject to change in a future revision. Can also be the product of reaction with EZ-Link Sulfo-NHS-SS-Biotin (Sulfosuccinimidyl 2-(biotinamido)-ethyl-1, 3-dithiopropionate) followed by reduction with DTT Found on vision signal transduction proteins Found on vision signal transduction proteins Core structure of high-mannose N-linked oligosaccharides MS/MS experiments of mass spectrometric a-ions (MS^3) can be used for protein identification by library searching. T3-sequencing is such a technique (see reference). Search engines must recognize this \'virtual modification\' for this purpose. Conversion of glycosylated asparagine residues upon deglycosylation with PGNase F in 18O labelled water. BHT metabolism has been studied in rats and mice in relation to tumor promotion. Phosphoserine to S-ethylcystine\r\nvia Beta elimination/Michael addition of ethylthiol DAET = 2-(dimethylamino)ethanethiol; The phosphorylation to amine is the beta elimination of phosphate and Michael addition of 2-(dimethylamino)ethanethiol to the site. OH-PGO and PGO react with arginine at a stoichiometry of 2:1 Different channels have the same nominal mass but slightly different exact masses. Use this value for all channels for quantitation purposes. mTRAQ heavy is identical to iTRAQ4plex 117 Cytopiloyne is a polyacetylenic glucoside isolated form Bidens pilosa which can modulate T helper cell differentiation. Biotinylated cytopiloyne might be use to identify its receptor in T cell. Cytopiloyne is a polyacetylenic glucoside isolated form Bidens pilosa which can modulated T helper cell differentiation. Biotinylated cytopiloyne might be use to identify its receptor in T cell. PET = 2-[4-pyridyl]ethanethiol. This modification is a chemical derivative, based on a alkaline catalysed beta-elimination of phosphoserines and phosphothreonines and subsequent 1,4-addition of 2-[4-pyridine]ethanethiol. These modified serines and threonines produce in MS/MS a characteristic fragment which can be used for precursor-ion-scan experiments. N-terminal sulfonation of diglycine to detect ubiquitination sites Protein which is posttranslationally modified by the attachment of a nitric oxide group on the sulfur atom of one or more cysteine residues. Potential protein modification when using AEBSF (Pefabloc) as a serine protease inhibitor. EDC crosslinker is used to couple biotin PEO-amine to carboxyl groups or 5\' phosphate groups The cleavage of a peptide bond between Try-Xxx with oxidation of tryptophan to the oxolactone occurs in the presence of BNPS-skatole. This is a useful method for the chemical cleavage of proteins specifically at tryptophan residues. One note about this chemistry is that for W you have to take care of O2 big time (and extract the I-uracil monophosphate with organics to get rid of residual iodide). esterification of carboxylic acids using D3-Methanolic HCl