title: [Synthesis of new chromogenic substrates for aspartyl proteases].
abstract: A general method was developed for the synthesis of new chromogenic substrates of aspartyl proteases: Dnp-Ala-Xaa-Phe-Phe-Ala-Arg-NH2, where Xaa was Ala or Ser. The synthetic scheme involved both chemical and enzymic stages, the condensation of tripeptides in an organic medium by means of pepsin immobilized on Celite being among the latters. The influence of organic solvents, reaction time, and the composition and ionic strength of the buffers used in the reaction mixture and at the pepsin immobilization step on the efficacy of the pepsin-catalyzed synthesis was studied.
authors.affiliation: Department of Chemistry, Moscow State University, Russia.
authors.forename: O V
authors.initials: OV
authors.lastname: Litvinova
authors.forename: G N
authors.initials: GN
authors.lastname: Balandina
authors.forename: V M
authors.initials: VM
authors.lastname: Stepanov
mesh_terms: D000409:Alanine / Q000737:chemistry; D016282:Aspartic Acid Endopeptidases / Q000737:chemistry*; D002021:Buffers; D002384:Catalysis; D002863:Chromogenic Compounds / Q000138:chemical synthesis*; D007692:Diatomaceous Earth / Q000737:chemistry; D004800:Enzymes, Immobilized; D009994:Osmolar Concentration; D010434:Pepsin A / Q000737:chemistry; D012694:Serine / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013379:Substrate Specificity
chemical_list: D002021:Buffers; D002863:Chromogenic Compounds; D004800:Enzymes, Immobilized; D012997:Solvents; D012694:Serine; D007692:Diatomaceous Earth; D016282:Aspartic Acid Endopeptidases; D010434:Pepsin A; D000409:Alanine