13 Jan Oxygen donates electron dens
Which of the following statements best describes the hydrogen bonding network between deoxyhemoglobin (2HHB) and the Fe-heme ligand?
There are 2 direct hydrogen bonds between the ligand and hemoglobin amino acids.
There are no hydrogen bonds between the ligand and hemoglobin amino acids.
There are no direct hydrogen bonds between the ligand and hemoglobin amino acids, however there are 2 bridged hydrogen bonds that connect the Fe-heme to the protein via a water molecule.
There are no direct hydrogen bonds between the ligand and hemoglobin amino acids, however there are 2 bridged hydrogen bonds that connect the Fe-heme to the protein via atomic oxygen.
In both structures, the most abundant noncovalent interactions are the multiple hydrophobic interactions between the _______ of Fe-heme and the ______ in the binding site.
carbon groups; polar amino acids
carbon groups; nonpolar amino acids
iron atom; polar amino acids
iron atom; nonpolar amino acids
Which of the following statements is consistent with the interaction between His 92 of Chain B and the Fe-heme of deoxyhemoglobin?
His 92 donates electron density to the iron atom via the lone pair on atom NE2.
His 92 donates electron density to the iron atom via the lone pair on atom ND1.
His 92 forms an ion pair with the iron atom.
His 92 accepts electron density from the iron atom.
Which of the following statements is consistent with the binding of oxygen to hemoglobin (1HHO)?
Oxygen donates electron density to the iron atom and accepts electron density from the side chain of His 92?.
Oxygen accepts electron density from the iron atom and accepts electron density from the side chain of His 92?.
Oxygen donates electron density to the iron atom and donates electron density to the N—H group in the side chain of His 92?.
Oxygen accepts electron density from the iron atom and donates electron density to the N—H group in the side chain of His 92?.
In deoxyhemoglobin, which of the following subunit pairs has the longest distance between the iron atoms of the Fe-heme groups?
?1-?1
?1-b1
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