Regeneration of bovine pancreatic ribonuclease A. 1. Steady-state distribution

Biochemistry ◽  
1993 ◽  
Vol 32 (10) ◽  
pp. 2671-2679 ◽  
Author(s):  
David M. Rothwarf ◽  
Harold A. Scheraga
1985 ◽  
Vol 248 (5) ◽  
pp. C498-C509 ◽  
Author(s):  
D. Restrepo ◽  
G. A. Kimmich

Zero-trans kinetics of Na+-sugar cotransport were investigated. Sugar influx was measured at various sodium and sugar concentrations in K+-loaded cells treated with rotenone and valinomycin. Sugar influx follows Michaelis-Menten kinetics as a function of sugar concentration but not as a function of Na+ concentration. Nine models with 1:1 or 2:1 sodium:sugar stoichiometry were considered. The flux equations for these models were solved assuming steady-state distribution of carrier forms and that translocation across the membrane is rate limiting. Classical enzyme kinetic methods and a least-squares fit of flux equations to the experimental data were used to assess the fit of the different models. Four models can be discarded on this basis. Of the remaining models, we discard two on the basis of the trans sodium dependence and the coupling stoichiometry [G. A. Kimmich and J. Randles, Am. J. Physiol. 247 (Cell Physiol. 16): C74-C82, 1984]. The remaining models are terter ordered mechanisms with sodium debinding first at the trans side. If transfer across the membrane is rate limiting, the binding order can be determined to be sodium:sugar:sodium.


1963 ◽  
Vol 238 (2) ◽  
pp. 618-621 ◽  
Author(s):  
Arthur M. Crestfield ◽  
William H. Stein ◽  
Stanford Moore

1973 ◽  
Vol 248 (22) ◽  
pp. 7833-7837
Author(s):  
Ryoko Kobayashi ◽  
C.H.W. Hirs ◽  
With the technical assistance of Marie Hagenhuber

2011 ◽  
Vol 319 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Hideaki Takusagawa ◽  
Shigefumi Yamamura ◽  
Shigeru Endo ◽  
Yoko Sugawara ◽  
Toshiyuki Inagaki ◽  
...  

Biochemistry ◽  
2001 ◽  
Vol 40 (1) ◽  
pp. 93-104 ◽  
Author(s):  
Amiel Navon ◽  
Varda Ittah ◽  
John H. Laity ◽  
Harold A. Scheraga ◽  
Elisha Haas ◽  
...  

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