title: Why does pepsin have a negative charge at very low pH? An analysis of conserved charged residues in aspartic proteinases.
authors.affiliation: V.A. Engelhardt Institute of Molecular Biology, Academy of Sciences of the USSR, Moscow.
authors.forename: N S
authors.initials: NS
authors.lastname: Andreeva
authors.forename: M N
authors.initials: MN
authors.lastname: James
mesh_terms: D000818:Animals; D016282:Aspartic Acid Endopeptidases / Q000737:chemistry*; D003460:Crystallization; D004563:Electrochemistry; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D007526:Isoelectric Point; D008958:Models, Molecular; D010434:Pepsin A / Q000737:chemistry*; D011487:Protein Conformation; D013552:Swine
chemical_list: D016282:Aspartic Acid Endopeptidases; D010434:Pepsin A