NDLI: Thermodynamics of the alkaline transition in phytocyanins

Content Provider	Springer Nature Link
Author	Battistuzzi, Gianantonio Bellei, Marzia Dennison, Christopher Di Rocco, Giulia Sato, Katsuko Sola, Marco Yanagisawa, Sachiko
Copyright Year	2007
Abstract	The thermodynamics of the alkaline transition which influences the spectral and redox properties of the type 1 copper center in phytocyanins has been determined spectroscopically. The proteins investigated include Rhus vernicifera stellacyanin, cucumber basic protein and its Met89Gln variant, and umecyanin, the stellacyanin from horseradish roots, along with its Gln95Met variant. The changes in reaction enthalpy and entropy within the protein series show partial compensatory behavior. Thus, the reaction free energy change (hence the pK a value) is rather variable. This indicates that species-dependent differences in reaction thermodynamics, although containing an important contribution from changes in the hydrogen-bonding network of water molecules in the hydration sphere of the protein (which feature enthalpy–entropy compensation), are to a large extent protein-based. The data for axial ligand variants are consistent with the hypothesis of a copper-binding His as the deprotonating residue responsible for this transition.
Starting Page	895
Ending Page	900
Page Count	6
File Format	PDF
ISSN	09498257
Journal	JBIC Journal of Biological Inorganic Chemistry
Volume Number	12
Issue Number	6
e-ISSN	14321327
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-06-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alkaline transition Thermodynamics Electron transfer Phytocyanins Cupredoxins Microbiology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Biochemistry Inorganic Chemistry

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