2,3-Bisphosphoglyceric acid

2,3-Bisphosphoglyceric acid

Chemical structure of 2,3-Bisphosphoglyceric acid

2,3-Bisphosphoglyceric acid (2,3-BPG) is an important organic phosphate molecule found in red blood cells. It plays a crucial role in regulating the oxygen binding affinity of hemoglobin.

Structure

2,3-Bisphosphoglyceric acid is a three-carbon isomer of the glycolytic intermediate 1,3-bisphosphoglycerate. It contains two phosphate groups attached to the second and third carbon atoms of the glyceric acid backbone.

Function

2,3-BPG binds to deoxygenated hemoglobin, stabilizing it and reducing its affinity for oxygen. This facilitates the release of oxygen from hemoglobin in the tissues, enhancing oxygen delivery.

Role in Oxygen Transport

Oxyhemoglobin dissociation curve

The presence of 2,3-BPG shifts the oxyhemoglobin dissociation curve to the right, indicating a lower affinity of hemoglobin for oxygen. This shift is crucial for efficient oxygen unloading in peripheral tissues.

Fetal Hemoglobin

Fetal hemoglobin has a higher affinity for oxygen than adult hemoglobin.

Fetal hemoglobin (HbF) has a lower affinity for 2,3-BPG compared to adult hemoglobin (HbA). This difference allows fetal hemoglobin to have a higher affinity for oxygen, facilitating the transfer of oxygen from the maternal to the fetal circulation.

Metabolic Pathway

Pathway of generation of 2,3-bisphosphoglycerate

2,3-BPG is synthesized in red blood cells from 1,3-bisphosphoglycerate, an intermediate in the glycolysis pathway. The enzyme bisphosphoglycerate mutase catalyzes the conversion of 1,3-bisphosphoglycerate to 2,3-BPG.

Clinical Significance

Alterations in 2,3-BPG levels can affect oxygen delivery. For example, increased levels of 2,3-BPG are seen in conditions such as chronic hypoxia and anemia, enhancing oxygen release to tissues. Conversely, decreased levels can impair oxygen delivery.

Related pages

• Hemoglobin
• Glycolysis
• Oxygen transport
• Fetal hemoglobin

• 
  Chemical structure of 2,3-Bisphosphoglyceric acid
• 
  Pathway of generation of 2,3-bisphosphoglycerate
• 
  Oxyhemoglobin dissociation curve
• 
  Fetal hemoglobin has a higher affinity for oxygen than adult hemoglobin.

• 
  2,3-Bisphosphoglyceric acid structure
• 
  Pathway of generation of 2,3-bisphosphoglycerate
• 
  Oxyhaemoglobin dissociation curve
• 
  Fetal hemoglobin chart