1.1;) The diagram on the right compares the O2 binding prop-1.0erties or normal adult hemoglobin (HbA) to those of one dubbed HbGreat-Lakes characterized by the mutation Leu(B68)His. In the dia-gram Y = fraction of heme groups with bound O2, and pO2, the par-tial pressure of O2 above the solution, is measured in units of torr ormmHg.Hb Great Lakes%3D0.8Hb A0.6Draw the corresponding Hill plot, being careful to reproduce graph-ically the dissociation equilibrium constant for O2 binding (Ko2) for Yeach hemoglobin and to show the difference in the extent of allo-stery or cooperativity of subunit interaction in each type of hemo-globin.0.4You need draw only the central, linear portion of the Hill plot.0.2 FState what is the likely magnitude of the Hill constant (nH) for HbAfrom your reading and state what is the likely range of the magni-tude of the Hill coefficient for Hb Great Lakes.0 10 2030 405060pO2 (torr)

Hill plot for O2 binding to hemoglobin (Hb) has log(pO2) as X-axis and as Y-axis. We are given…

Answered: Hb Great Lakes 0.8 1. ;) The diagram on…

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter11: The Blood

Section: Chapter Questions

Problem 1SQE

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In a molecular disease of hemoglobin, Hemoglobin Rainier, Tyr 145β is replaced by Cys, which forms a disulfide bond with another Cysresidue in the same subunit. This prevents the formation of ion pairs that normally stabilize the T state. How does hemoglobin Rainier differ from normal hemoglobin with respect to (A)oxygen affinity, (B)the Bohr effect, and (C)the Hillcoefficient? Explain your answers.
) Dr Merrick is so excited to know the affinity constant Kd values for O2 binding to mammoth OBP and elephant hemoglobin at pH=7, that he starts speculating about the kinetics of binding to O2. If the ka value of mammoth EHb-O2 complex was the same as the ka value of mammoth OBP-O2 complex, what would be the ratio between the kd values of these complexes? Explain your reasoning. Hint: we are looking for the ratio kd(EHb)/kd(OBP) at pH=7.
The 2-3 phosphoglycerate (BFG) binds to the central gap formed by the hemoglobin monomers (a2b2) facilitating the reversible release of oxygen. Approximate relationships between BFG concentrations in red blood cells and Pos in hemoglobin are in the table.a) Draw the reaction schemeb) Write the forces that condition the union between hemoglobin and BFG
30. The cooperative binding behavior of hemoglobin for oxygen is best explained by... Group of answer choices The movement of the proximal histidine upon O2 binding causes a structural change at the binding interface between subunits The oxidation of Fe2+ to Fe3+ and formation of the superoxide ion causes distortion of the protoporphyrin ring, altering binding interface between subunits The tetrameric nature of hemoglobin's quaternary structure directly confers cooperative binding activity The movement of the distal histidine upon O2 binding causes a structural change at the binding interface between subunits The binding of O2 causes a pH shift that changes the protonation state of amino acids located at the interface between subunits The solubility of hemoglobin in aqueous solution and its insolubility in nonpolar environments
What qualitative effect would you expect each of the following to have onthe P50 of hemoglobin?(a) Increase in pH from 7.2 to 7.4(b) Increase in PCO2 from 20 to 40 mm Hg(c) Dissociation into monomer polypeptide chains(d) Decrease in 2,3-BPG concentration from 7 mM to 5 mM in red cells.
A new oxygen transport protein that exhibits cooperative binding has been isolated and is beingstudied in the lab. Calculate the KD value if Y = 0.76 when pO2 = 18 torr (assume n = 2.5). Howdoes this compare to the KD value for hemoglobin? Does this protein bind more or less tightly tooxygen compared to hemoglobin?
In a molecular disease of hemoglobin, Hemoglobin Rainier, Tyr 145β is replaced by Cys, which forms a disulfide bond with another Cysresidue in the same subunit. This prevents the formation of ion pairs that normally stabilize the T state. How does hemoglobin Rainier differ from normal hemoglobin with respect to the Hill coefficient
Sickle-cell hemoglobin (HbS) differs from normal human adult hemoglobin (HbA) by a single mutational change, Glu6 S Val, which causes the HbS molecules to aggregate under proper conditions. Under certain conditions, the HbS filaments that form at body temperature disaggregate when the temperature is lowered to 0°C. Explain.
Studies of oxygen transport in pregnant mammals have shown that the O2-saturation curves of fetal and maternal blood are markedly different when measured under the same conditions. Fetal erythrocytes contain a structural variant of hemoglobin, HbF, consisting of two γ and two β subunits (γ2β2), whereas maternal erythrocytes contain HbA (α2β2). (a) Which hemoglobin has a higher affinity for oxygen under physiological conditions, HbA or HbF? Explain. (b) What is the physiological significance of the different O2 affinities? (c) When all the BPG is carefully removed from samples of HbA and HbF, the measured O2-saturation curves (and consequently the O2 affinities) are displaced to the left. However, HbA now has a greater affinity for oxygen than does HbF. When BPG is reintroduced, the O2-saturation curves return to normal, as shown in the graph. What is the effect of BPG on the O2 affinity of hemoglobin? How can the above information be used to explain the different O2 affinities of…
In oxygenated hemoglobin, pKa 5 6.6 forthe histidines at position 146 on the -chain. In deoxygenated hemoglobin, the pKa of these residues is 8.2. How can this piece ofinformation be correlated with the Bohr effect?
Apohemoglobin (apoHb) is a dimeric globular protein with two vacant heme‐binding. The preparationof apoHb is based on partial hemoglobin (Hb) unfolding to facilitate heme extraction into an organic solvent. What is an appropriate method for removing the heme? a. An acidic buffer to protonate the His axial ligand in the presence of ureaas the denaturing agent. b. An acidic buffer to protonate the His axial ligand in the presence of mercatoethanol as the denaturing agent. c. A basic buffer to deprotonate the His axial ligand in the presence of ureaas the denaturing agent. d. An basic buffer to protonate the His axial ligand in the presence of mercatoethanol as the denaturing agent.
Studies of oxygen transport in pregnant mammals show that the O2-saturation curves of fetal and maternal blood are markedly different when measured under the same conditions. Fetal erythrocytes contain astructural variant of hemoglobin, HbF, consisting of two α and two γ subunits (α2 γ2 ), whereas maternal erythrocytes contain HbA (α2β2).(a) Which hemoglobin has a higher affinity for oxygen under physiological conditions, HbA or HbF? Explain.(b) What is the physiological significance of the different O2 affinities?(c) When all the BPG is carefully removed from samples of HbA and HbF, the measured O2 -saturation curves (and consequently the O2 affinities) are displaced to the left. However, HbA now has a greater affinity for oxygen than does HbF. When BPG is reintroduced, the O2 -saturation curves return to normal, as shown in the graph. What is the effect of BPG on the O2 affinity of hemoglobin? How can the above information be used to explain the different O2 affinities of fetal and…

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