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Bisaldehyde allosteric effectors as molecular ratchets and probes
T Boyiri1, M K Safo, R E Danso-Danquah
1Department of Medicinal Chemistry, School of Pharmacy, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298-0540, USA.
Biochemistry
|November 21, 1995
Summary
New bisaldehyde and monoaldehyde bisacid molecules were synthesized to study hemoglobin allosteric effectors. Chain length and binding interactions dictate the degree of allosteric modulation, influencing oxygen affinity.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Hemoglobin allosteric effectors are crucial for regulating oxygen transport.
- Understanding the structure-function relationship of hemoglobin modulators is key to developing therapeutic agents.
Purpose of the Study:
- To synthesize and evaluate novel monoaldehyde bisacids and bisaldehyde bisacids as allosteric effectors of hemoglobin.
- To elucidate the binding modes and structure-activity relationships of these compounds.
Main Methods:
- Synthesis of novel bisacid derivatives.
- Molecular modeling and simulation.
- Oxygen equilibrium measurements.
- X-ray crystallography.
Main Results:
- Bisaldehydes form Schiff base cross-links between Val 1 alpha and Lys 99 alpha of opposite alpha chains, influenced by molecular structure.
- Binding occurs along cavity walls, with longer chains showing similar binding patterns.
- Cross-linked bisaldehydes reduce cooperativity and oxygen affinity.
- Monoaldehyde bisacids form a Schiff base and a salt bridge, exhibiting weaker allosteric effects.
Conclusions:
- The binding mode and allosteric effect are dictated by the molecular structure and chain length of the bisacids.
- Lysine 99 alpha plays a critical role in the allosteric equilibrium of hemoglobin.
- These findings provide insights into hemoglobin allosteric regulation and potential therapeutic strategies.