Using the graph data I estimated Slope = 2.8, about the same as the steeper part of the maternal hemoglobin, does this represent a strong positive cooperativity between enzyme subunits?
Using the graph data I estimated Slope = 2.8, about the same as the steeper part of the maternal hemoglobin, does this represent a strong positive cooperativity between enzyme subunits?
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
Related questions
Question
Using the graph data I estimated Slope = 2.8, about the same as the steeper part of the maternal hemoglobin, does this represent a strong positive cooperativity between enzyme subunits?
![pO₂
10
15
20
25
30
35
50
100
Y
0.2
0.4
0.6
0.8
0.85
0.9
0.95
1.0
log pO₂
1.00
1.18
1.30
1.40
1.48
1.54
1.70
2.00
log (Y/(1-Y))
-0.60
-0.18
0.18
0.60
0.75
0.95
1.28
undefined](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0627210d-c0e3-4a2a-8541-a7399a2e5e96%2F291f98fc-9c7e-4558-b576-dd7cee648b90%2F978lc9p_processed.png&w=3840&q=75)
Transcribed Image Text:pO₂
10
15
20
25
30
35
50
100
Y
0.2
0.4
0.6
0.8
0.85
0.9
0.95
1.0
log pO₂
1.00
1.18
1.30
1.40
1.48
1.54
1.70
2.00
log (Y/(1-Y))
-0.60
-0.18
0.18
0.60
0.75
0.95
1.28
undefined
![log (Y/(1-Y))
1.5
1
-0.5
-1
0.5
Fetal Hemoglobin Hill Plot
1
log po₂
1.5
2
2.5
5. Estimate the slope(s) of the Hill plot, for the portion(s) that is (are) clearly linear. This number
is the Hill coefficient, symbolized n or ní. For instance, for the maternal hemoglobin plot above,
the Hill coefficients are 1.0 and 2.8 (the steeper part in the middle). If the Hill coefficient = 1.0,
then there is no cooperativity between enzyme subunits. If the coefficient is greater than 1.0,
there is positive cooperativity. If the coefficient is less than 1.0, there is negative cooperativity.
Comment on the type and degree of cooperativity shown in the fetal hemoglobin, compared to
the maternal hemoglobin.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0627210d-c0e3-4a2a-8541-a7399a2e5e96%2F291f98fc-9c7e-4558-b576-dd7cee648b90%2Fvopzsrf_processed.png&w=3840&q=75)
Transcribed Image Text:log (Y/(1-Y))
1.5
1
-0.5
-1
0.5
Fetal Hemoglobin Hill Plot
1
log po₂
1.5
2
2.5
5. Estimate the slope(s) of the Hill plot, for the portion(s) that is (are) clearly linear. This number
is the Hill coefficient, symbolized n or ní. For instance, for the maternal hemoglobin plot above,
the Hill coefficients are 1.0 and 2.8 (the steeper part in the middle). If the Hill coefficient = 1.0,
then there is no cooperativity between enzyme subunits. If the coefficient is greater than 1.0,
there is positive cooperativity. If the coefficient is less than 1.0, there is negative cooperativity.
Comment on the type and degree of cooperativity shown in the fetal hemoglobin, compared to
the maternal hemoglobin.
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