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Purification, Crystallization and Preliminary X-Ray Diffraction Studies on Goat (Capra hircus) Hemoglobin - A Low Oxygen Affinity Species

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Abstract:

Hemoglobin is a vital protein present in almost all higher species. It is a transport protein involved in carrying oxygen from lungs to tissues and carbon dioxide back to lungs by an intrinsically coordinated manner. Even though a good amount of work has been carried out in this direction there exists scarcity of structural insight on low oxygen affinity species. Attempts are being made to unravel the structural insight of this low oxygen affinity species. Goat blood plasma was collected, treated with EDTA to avoid blood clotting and purification was accomplished using DEAE-anion chromatographic column. The goat hemoglobin was crystallized using 50mM of phosphate buffer at pH 6.7 with 1M NaCl and PEG 3350 as precipitant by hanging drop vapor diffusion method. Crystals obtained are screened and suitable crystals are taken for data collection using mar345dtb as image plate detector system. Goat hemoglobin crystal diffracted up to 2.61 Å resolution. Goat hemoglobin crystallizes in orthorhombic space group P212121 as a whole biological molecule in the asymmetric unit with cell dimensions a=53.568Å, b=67.365Å, c=154.183Å.





Keywords: 2, 3 disphosphoglycerate; Capra hircus; allosteric mechanism; chromatography; low oxygen affinity; orthorhombic

Document Type: Research Article

DOI: http://dx.doi.org/10.2174/092986609787847992

Publication date: April 1, 2009

More about this publication?
  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
ben/ppl/2009/00000016/00000004/art00019
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