title: Chemical cleavage of proteins on membranes.
abstract: Described in this unit are five basic protocols that are widely used for specific and efficient chemical cleavage of proteins bound to membranes. Cyanogen bromide (CNBr) cleaves at methionine (Met) residues; BNPS-skatole cleaves at tryptophan (Trp) residues; formic acid cleaves at aspartic acid-proline (Asp-Pro) peptide bonds; hydroxylamine cleaves at asparagine-glycine (Asn-Gly) peptide bonds, and 2-nitro-5-thiocyanobenzoic acid (NTCB) cleaves at cysteine (Cys) residues. Because the above loci are at relatively low abundance in most proteins, digestion with these agents will yield relatively long peptides. In addition, Alternate Protocol an describes CNBr cleavage of PVDF-bound protein previously analyzed by Edman degradation. Finally, a Support Protocol discusses preferred methods of separating and analyzing peptide fragments generated by the chemical cleavage reactions described in the basic protocols.
authors.affiliation: Washington University School of Medicine, St. Louis, Missouri, USA.
authors.forename: D L
authors.initials: DL
authors.lastname: Crimmins
authors.forename: S M
authors.initials: SM
authors.lastname: Mische
authors.forename: N D
authors.initials: ND
authors.lastname: Denslow
mesh_terms: D000596:Amino Acids; D003488:Cyanogen Bromide / Q000378:metabolism; D005561:Formates / Q000378:metabolism; D019811:Hydroxylamine / Q000378:metabolism; D008567:Membranes, Artificial; D010446:Peptide Fragments / Q000032:analysis / Q000302:isolation & purification; D010455:Peptides / Q000737:chemistry; D011145:Polyvinyls; D011506:Proteins / Q000378:metabolism*; D020539:Sequence Analysis, Protein; D013861:Thiocyanates / Q000378:metabolism; D005465:Fluorocarbon Polymers
chemical_list: D000596:Amino Acids; D003488:Cyanogen Bromide; D005561:Formates; D019811:Hydroxylamine; D008567:Membranes, Artificial; D010446:Peptide Fragments; D010455:Peptides; D011145:Polyvinyls; D011506:Proteins; D013861:Thiocyanates; C030544:formic acid; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers; C008658:2-nitro-5-thiocyanobenzoic acid