Biomaterial Database

Unfolding by temperature and guanidine hydrochloride of chicken pancreatic polypeptide. 1986

I Kanazawa, and K Hamaguchi

Thermal unfolding of chicken pancreatic polypeptide at two different concentrations was studied at various pH values. The thermal stability was higher at higher protein concentrations. The transition temperatures at two different protein concentrations changed with pH in parallel and decreased by about 30 degrees C on lowering pH from 5 to 2. The results on the thermal unfolding were analyzed by assuming that the dimerization constant is independent of pH, that the thermal unfolding occurs only after the pancreatic polypeptide dimers dissociated into the monomers, and that one ionizable group participates in the acid unfolding of the monomer. The free energy change for the unfolding of the pancreatic polypeptide monomer was estimated to be 1.4 kcal/mol. The unfolding of pancreatic polypeptide by guanidine hydrochloride at pH 6.0 and 25 degrees C was also studied. The stability to guanidine hydrochloride was higher at higher protein concentrations.

UI	MeSH Term	Description	Entries
D007700	Kinetics	The rate dynamics in chemical or physical systems.
D008433	Mathematics	The deductive study of shape, quantity, and dependence. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Mathematic
D010191	Pancreatic Polypeptide	A 36-amino acid pancreatic hormone that is secreted mainly by endocrine cells found at the periphery of the ISLETS OF LANGERHANS and adjacent to cells containing SOMATOSTATIN and GLUCAGON. Pancreatic polypeptide (PP), when administered peripherally, can suppress gastric secretion, gastric emptying, pancreatic enzyme secretion, and appetite. A lack of pancreatic polypeptide (PP) has been associated with OBESITY in rats and mice.	Pancreatic Polypeptide (PP),Pancreatic Polypeptide Hormone,Pancreatic Prohormone
D011489	Protein Denaturation	Disruption of the non-covalent bonds and/or disulfide bonds responsible for maintaining the three-dimensional shape and activity of the native protein.	Denaturation, Protein,Denaturations, Protein,Protein Denaturations
D002645	Chickens	Common name for the species Gallus gallus, the domestic fowl, in the family Phasianidae, order GALLIFORMES. It is descended from the red jungle fowl of SOUTHEAST ASIA.	Gallus gallus,Gallus domesticus,Gallus gallus domesticus,Chicken
D006146	Guanidines	A family of iminourea derivatives. The parent compound has been isolated from mushrooms, corn germ, rice hulls, mussels, earthworms, and turnip juice. Derivatives may have antiviral and antifungal properties.
D006863	Hydrogen-Ion Concentration	The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH	pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D013816	Thermodynamics	A rigorously mathematical analysis of energy relationships (heat, work, temperature, and equilibrium). It describes systems whose states are determined by thermal parameters, such as temperature, in addition to mechanical and electromagnetic parameters. (From Hawley's Condensed Chemical Dictionary, 12th ed)	Thermodynamic
D019791	Guanidine	A strong organic base existing primarily as guanidium ions at physiological pH. It is found in the urine as a normal product of protein metabolism. It is also used in laboratory research as a protein denaturant. (From Martindale, the Extra Pharmacopoeia, 30th ed and Merck Index, 12th ed) It is also used in the treatment of myasthenia and as a fluorescent probe in HPLC.	Guanidine Hydrochloride,Guanidinium,Guanidinium Chloride,Guanidine Monohydrate,Guanidine Monohydrobromide,Guanidine Monohydrochloride,Guanidine Monohydroiodine,Guanidine Nitrate,Guanidine Phosphate,Guanidine Sulfate,Guanidine Sulfate (1:1),Guanidine Sulfate (2:1),Guanidine Sulfite (1:1),Guanidium Chloride,Chloride, Guanidinium,Chloride, Guanidium,Hydrochloride, Guanidine,Monohydrate, Guanidine,Monohydrobromide, Guanidine,Monohydrochloride, Guanidine,Monohydroiodine, Guanidine,Nitrate, Guanidine,Phosphate, Guanidine,Sulfate, Guanidine