Iron‑sulfur proteins, metalloenzymes and metal storage and transport for Fe, Cu and Zn - One Line Questions

1. Which of the following is a common type of Fe-S cluster found in proteins? — All of the above
2. Which iron-sulfur cluster is found in ferredoxins and participates in electron transfer in photosynthesis and respiration? — [4Fe-4S]
3. The protein Rubredoxin contains which type of iron-sulfur cluster? — [1Fe-1S]
4. What is the typical oxidation state of iron in the active site of many iron-sulfur proteins during electron transfer? — Varies between +1 and +3
5. Which protein is responsible for transporting copper in the blood? — Ceruloplasmin
6. Which metalloenzyme, containing zinc, plays a critical role in maintaining acid-base balance by catalyzing the rapid interconversion of carbon dioxide and water to bicarbonate and protons? — Carbonic anhydrase
7. What is the primary function of copper in cytochrome c oxidase? — Transferring electrons to oxygen
8. How is iron transported in the bloodstream? — Bound to transferrin
9. Which of the following metalloenzymes is involved in the detoxification of reactive oxygen species by converting superoxide radicals to oxygen and hydrogen peroxide? — Superoxide dismutase (SOD)
10. Which of the following is a metalloenzyme that uses zinc and is involved in the breakdown of peptides? — Carboxypeptidase A
11. What is the function of aconitase, a metalloenzyme containing an iron-sulfur cluster? — Catalyzing the isomerization of citrate to isocitrate
12. Which protein is responsible for sequestering excess intracellular copper and preventing its toxicity? — Metallothionein
13. Which metal is primarily stored in the protein ferritin? — Iron
14. Myoglobin, an oxygen-binding protein found in muscle tissue, contains which metal? — Iron
15. What is the role of iron in the electron transport chain? — Acting as a cofactor in cytochromes and iron-sulfur proteins for electron transfer
16. Which of the following is a metalloenzyme that plays a role in DNA synthesis and repair, utilizing zinc? — DNA polymerase
17. What is the role of cytochrome P450 enzymes, which often contain heme iron? — Drug metabolism and biosynthesis of steroids
18. What is the primary function of copper in the enzyme superoxide dismutase (Cu/Zn-SOD)? — Facilitating electron transfer from superoxide
19. Which iron-sulfur protein is a key component of the mitochondrial electron transport chain? — Succinate dehydrogenase
20. What is the structure of the [4Fe-4S] cluster? — A cube-like structure with alternating iron and sulfur atoms
21. Which of the following is a characteristic feature of iron-sulfur proteins related to their function? — Ability to participate in one-electron redox reactions
22. What is the primary mechanism by which metallothioneins bind to zinc and copper? — Coordination with sulfhydryl groups of cysteine residues
23. Wilson's disease is a genetic disorder characterized by the accumulation of excess which metal in the body? — Copper
24. Which metal is the central atom in carbonic anhydrase, an enzyme crucial for CO2 transport in the blood? — Zinc
25. Which metal is essential for the activity of alcohol dehydrogenase, involved in alcohol metabolism? — Zinc
26. What is the function of hephaestin, a ferroxidase similar to ceruloplasmin? — Iron absorption in the intestine
27. What is the function of the protein ICP (Iron-Regulated Transporter 1)? — Iron import into cells
28. What is the function of the protein DMT1 (divalent metal transporter 1)? — Iron and other divalent metal ion uptake into cells
29. What is the role of the protein ferroportin? — Iron export from cells
30. What is the primary role of metallothioneins? — Zinc and copper detoxification and storage
31. What is the primary function of ceruloplasmin? — Copper transport and oxidation of Fe(II) to Fe(III)
32. What is the significance of the redox activity of iron in biological systems? — It is essential for catalyzing electron transfer reactions
33. Which of the following is a metalloenzyme containing copper and involved in the breakdown of extracellular matrix components? — Lysyl oxidase
34. Which protein is involved in the cellular uptake and storage of zinc? — Metallothionein
35. Which iron-containing protein is responsible for oxygen transport in red blood cells? — Hemoglobin
36. Which metalloenzyme utilizes iron-sulfur clusters for its catalytic activity in nitrogen fixation? — Nitrogenase
37. The [2Fe-2S] cluster is commonly found in which type of proteins? — Bacterial ferredoxins and plant-type ferredoxins
38. What is the primary role of iron-sulfur (Fe-S) clusters in biological systems? — Electron transfer and redox reactions
39. In which cellular process are iron-sulfur proteins critically involved? — Photosynthesis and respiration
40. What is the role of the protein hepcidin in iron homeostasis? — Regulating iron release from cells by degrading ferroportin
41. What is the function of the protein hemojuvelin in iron homeostasis? — Regulating hepcidin expression
42. What is the role of transferrin in iron metabolism? — Transporting iron from the intestines and macrophages to cells
43. What amino acid residue is typically involved in coordinating iron atoms within Fe-S clusters in proteins? — Cysteine
44. What is the function of heme oxygenase, an enzyme containing iron? — Degrading heme and producing biliverdin
45. What is the typical coordination environment for zinc in metalloenzymes like carbonic anhydrase? — Tetrahedral coordination with histidine residues
46. Which iron-storage protein is found within cells and has a hollow core where iron can be deposited as ferric oxyhydroxide polymers? — Ferritin
47. What is the main function of ferritin in the body? — Storing iron in a soluble and non-toxic form
48. Which metalloenzyme is involved in the synthesis of neurotransmitters and plays a role in copper metabolism? — Dopamine beta-hydroxylase
49. Which copper-containing enzyme is involved in the synthesis of melanin? — Tyrosinase
50. Which disease is associated with a deficiency in copper transport due to a defect in the ATP7A protein? — Menkes disease
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