Functional and computer modelling studies of haemoglobin from horse. The haemoglobin system of the Sardinian wild dwarf horse.

This research focuses on analyzing the properties of the haemoglobin system in the Sardinian dwarf horse. The results suggest there’s no significant functional difference between the four haemoglobin components in this species, with molecular patterns having potential implications for the creature’s low oxygen affinity and its weak interaction with the compound 2,3-diphosphoglycerate.

Study Information and Findings

• The research aimed to understand the haemoglobin system found in the Sardinian dwarf horse (Equus caballus jara), one of the last remaining wild horse species in Europe.
• The researchers focused on the oxygen-binding traits of the whole haemolysate and the four different horse haemoglobins, which were separated using a technique called ion-exchange chromatography.
• Focusing specifically on the effect of chloride, 2,3-diphosphoglycerate, and lactate, it was found that there were no significant functional differences between the four distinct components of horse haemolysate.

Molecular Basis and Computer Modelling

• The researchers also discuss the molecular basis of the horse’s relatively low oxygen affinity and the weak interaction of horse haemoglobin with 2,3-diphosphoglycerate, a phenomenon examined using the primary structure of the molecule, and the results derived from a computer modelling approach.
• Such an approach not only helps in in-depth understanding but also allows prediction of behaviours and future studies.

Key Conclusions

• The study suggests that the A1 (Thr–>Ser) and A2 (Pro–>Gly) substitutions observed in the beta chains from horse haemoglobin might be accountable for the displacement of the A helix, which is known as a critical structural feature of haemoglobins that show an altered interaction with 2,3-diphosphoglycerate compared to human haemoglobin.
• These findings expand the knowledge about the haemoglobin function in horses and may offer important insights to a broader understanding of haemoglobin biochemistry in other species, including humans.