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Whale (Balaenoptera physalus) haemoglobin: primary structure, functional characterisation and computer modelling
Marcella Corda1, Maurizio Tamburrini, Maria C De Rosa
1Department of Sciences Applied to Biosystems, University of Cagliari-Cittadella Universitaria, I-09042 Monserrato CA, Italy.
Summary
Whale hemoglobin
Area of Science:
- Biochemistry
- Marine Mammal Physiology
Background:
- Marine mammals like whales have unique physiological adaptations for diving.
- Hemoglobin's function is crucial for oxygen transport, especially during prolonged dives in cold environments.
Purpose of the Study:
- To investigate the functional properties of Mediterranean whale (Balaenoptera physalus) hemoglobin.
- To understand the molecular basis of hemoglobin's interaction with effectors like carbon dioxide and lactate.
- To explore the structural reasons for altered 2,3-diphosphoglycerate (2,3-DPG) binding.
Main Methods:
- Functional assays of hemoglobin under varying conditions (effector concentration, temperature).
- Analysis of primary protein structure.
- Computer modeling of hemoglobin structure and function.
Main Results:
- Whale hemoglobin function is sensitive to temperature, carbon dioxide, and lactate.
- A specific amino acid substitution (Pro-->Ala) in beta chains may alter A helix positioning.
- This structural change likely explains the weak interaction with 2,3-diphosphoglycerate.
Conclusions:
- The A2 substitution in whale hemoglobin beta chains influences its oxygen-binding properties.
- These findings provide insights into the regulatory mechanisms of hemoglobin in diving mammals.
- Comparative analysis with Arctic whale hemoglobin deepens understanding of temperature and effector interactions.