VIPSolutionswhat's question 13 based on my answer to q12 12) At physiological pH, which amino acids act as axial heme iron ligands to cytochrome c ? Illustrate which atoms of these amino acids form coordinate bonds to the heme iron. [3 marks] The axial ligands on cytochrome c are methionine and histidine. The sulphur of methionine and nitrogen of histidine form coordinate bonds to the iron of heme unit. 13) In the absorbance spectrum of ferric cytochrome c a weak absorbance band is observed at 695 nm . Which axial ligand to the heme iron is this absorbance band associated with? [2 marks]
Question:
what's question 13 based on my answer to q12 12) At physiological pH, which amino acids act as axial heme iron ligands to cytochrome c ? Illustrate which atoms of these amino acids form coordinate bonds to the heme iron. [3 marks] The axial ligands on cytochrome c are methionine and histidine. The sulphur of methionine and nitrogen of histidine form coordinate bonds to the iron of heme unit. 13) In the absorbance spectrum of ferric cytochrome c a weak absorbance band is observed at 695 nm . Which axial ligand to the heme iron is this absorbance band associated with? [2 marks]
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Asked by: srivalli Mattaparthi
Created at: 2025-08-28 20:22:10
Asked by: srivalli Mattaparthi
Created at: 2025-08-28 20:22:10
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Based on your answer to Q12:
**Q12 Answer Recap:**
You stated that the axial heme iron ligands in cytochrome c are methionine and histidine, with the *sulphur of methionine* and the *nitrogen of histidine* forming coordinate bonds to the iron.
**Q13:**
*In the absorbance spectrum of ferric cytochrome c a weak absorbance band is observed at 695 nm. Which axial ligand to the heme iron is this absorbance band associated with? [2 marks]*
**Answer:**
The weak absorbance band at **695 nm** in ferric cytochrome c is specifically associated with the **methionine ligand**. This band arises due to a charge transfer transition between the **sulphur atom of methionine** (the axial ligand) and the ferric (Fe³⁺) heme iron.
**Model Answer:**
The 695 nm absorbance band in ferric cytochrome c is associated with the **methionine ligand**. This band results from a charge transfer between the sulphur atom of methionine (which is coordinated to the heme iron) and the ferric iron center.
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