Spectrophotometric and kinetic evidence for the existence of at least two salt-dependent conformations of α-chymotrypsin at pH values near neutrality

G. Royer; C. C. Cuppett; E. Williams; H. Resnick; W. J. Canady

doi:10.1016/0003-9861(69)90274-4

Spectrophotometric and kinetic evidence for the existence of at least two salt-dependent conformations of α-chymotrypsin at pH values near neutrality

G. Royer, C. C. Cuppett, E. Williams, H. Resnick, W. J. Canady

Division of Mathematics & Natural Sciences (Altoona)

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Original language	English (US)
Pages (from-to)	253-255
Number of pages	3
Journal	Archives of Biochemistry and Biophysics
Volume	134
Issue number	1
DOIs	https://doi.org/10.1016/0003-9861(69)90274-4
State	Published - Oct 1969

All Science Journal Classification (ASJC) codes

Biophysics
Biochemistry
Molecular Biology

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10.1016/0003-9861(69)90274-4

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@article{0f105b357c64498ea1383b1c0230fdbf,

title = "Spectrophotometric and kinetic evidence for the existence of at least two salt-dependent conformations of α-chymotrypsin at pH values near neutrality",

author = "G. Royer and Cuppett, {C. C.} and E. Williams and H. Resnick and Canady, {W. J.}",

note = "Funding Information: K w and R, being the association constants for complex formation in pure water and in a solution of a given ionic strength, respectively. The yZ, 71, and “13 terms are activity coefficients at that given ionic strength for E, ES, and S, respectively. It was shown that 73 can be independently evaluated from the effect of salt on the solubility of the substrate. Equation 1 shows that the simplest explanation of the fact that the salting-out term is the predominant one is that the activity coefficients y1 and yt (of ES and E) are independent of ionic strength; added salt does not materially affect the state of ES or E. It will be seen that the data presented here support this formulation. The activity coefficient of E or ES refers primarily to the area of the active site since these data are kinetically derived. It was previously emphasized (1) that “the studies done so far do not attempt to deal with effects at very low ionic strengths, but rather with the gross effect of reasonably high concentrations of salts. All values quoted for pure water are extrapolated values obtained from plots of log I( against ionic strength.” 1 This work was supported 08122 of the National Institutes Grant GB 8143 of t,he National tion.",

year = "1969",

month = oct,

doi = "10.1016/0003-9861(69)90274-4",

language = "English (US)",

volume = "134",

pages = "253--255",

journal = "Archives of Biochemistry and Biophysics",

issn = "0003-9861",

publisher = "Academic Press Inc.",

number = "1",

}

TY - JOUR

T1 - Spectrophotometric and kinetic evidence for the existence of at least two salt-dependent conformations of α-chymotrypsin at pH values near neutrality

AU - Royer, G.

AU - Cuppett, C. C.

AU - Williams, E.

AU - Resnick, H.

AU - Canady, W. J.

N1 - Funding Information: K w and R, being the association constants for complex formation in pure water and in a solution of a given ionic strength, respectively. The yZ, 71, and “13 terms are activity coefficients at that given ionic strength for E, ES, and S, respectively. It was shown that 73 can be independently evaluated from the effect of salt on the solubility of the substrate. Equation 1 shows that the simplest explanation of the fact that the salting-out term is the predominant one is that the activity coefficients y1 and yt (of ES and E) are independent of ionic strength; added salt does not materially affect the state of ES or E. It will be seen that the data presented here support this formulation. The activity coefficient of E or ES refers primarily to the area of the active site since these data are kinetically derived. It was previously emphasized (1) that “the studies done so far do not attempt to deal with effects at very low ionic strengths, but rather with the gross effect of reasonably high concentrations of salts. All values quoted for pure water are extrapolated values obtained from plots of log I( against ionic strength.” 1 This work was supported 08122 of the National Institutes Grant GB 8143 of t,he National tion.

PY - 1969/10

Y1 - 1969/10

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DO - 10.1016/0003-9861(69)90274-4

M3 - Article

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AN - SCOPUS:0014589797

SN - 0003-9861

VL - 134

SP - 253

EP - 255

JO - Archives of Biochemistry and Biophysics

JF - Archives of Biochemistry and Biophysics

IS - 1

ER -

Spectrophotometric and kinetic evidence for the existence of at least two salt-dependent conformations of α-chymotrypsin at pH values near neutrality

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