Hemoglobin and Myoglobin Lecture Notes

A set of flashcards covering key concepts from the lecture notes on hemoglobin and myoglobin.

Hemoglobin

A protein in red blood cells that carries oxygen from the lungs to the tissues and helps return carbon dioxide from the tissues back to the lungs.

Myoglobin

A protein that carries oxygen in muscle cells, has a higher affinity for oxygen than hemoglobin.

Sigmoidal binding curve

A characteristic S-shaped binding curve indicating cooperative binding, essential for hemoglobin's function in oxygen transport.

Cooperativity

The interaction among binding sites on a protein, where the binding of a ligand to one site affects the binding of additional ligands to other sites.

Bohr Effect

The effect of pH on the affinity of hemoglobin for oxygen; lower pH (higher CO2 levels) decreases affinity, facilitating oxygen release.

p50

The partial pressure of oxygen at which hemoglobin is 50% saturated with oxygen, a key measure of hemoglobin's affinity for oxygen.

Hill equation

A mathematical equation used to describe the cooperative binding of ligands to a protein.

T state

The low-affinity conformation of hemoglobin that occurs when oxygen is not bound.

R state

The high-affinity conformation of hemoglobin that occurs when oxygen is bound.

D-2,3-bisphosphoglycerate (BPG)

A molecule that binds to deoxyhemoglobin, reducing its affinity for oxygen; important for regulating hemoglobin function.

Sickle cell anemia

A genetic disorder caused by a mutation in hemoglobin that leads to the formation of rigid fibers, deforming red blood cells.