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Purification of the neurotensin receptor from mouse brain by affinity chromatography


Purification of the neurotensin receptor from mouse brain by affinity chromatography



Journal of Biological Chemistry 264(10): 5559-5563



ISSN/ISBN: 0021-9258

PMID: 2538423

The neurotensin receptor was purified from newborn mouse brain by affinity chromatography. Active neurotensin binding sites were solubilized from brain homogenates using the nondenaturing detergent 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonic acid (CHAPS) in the presence of cholesteryl hemisuccinate. Chromatography of the soluble extract on SP-Sephadex C-25 and hydroxylapatite eliminated 50% of proteins without loss of neurotensin binding activity. This prepurified material was loaded into an affinity column prepared by coupling neurotensin (2-13) to glutaraldehyde-activated Ultrogel AcA22. Nonspecifically adsorbed proteins were eliminated by extensive washing, and the receptor was eluted with a buffer containing 1 M NaCl, 0.1% CHAPS, and 0.02% cholesteryl hemisuccinate. After desalting, the purified receptor bound 125I-labeled neurotensin with a dissociation constant of 0.26 nM and retained its specificity towards a series of neurotensin analogues. The desalted NaCl eluate appeared on sodium dodecyl sulfate-polyacrylamide gel electrophoresis as a major band of molecular weight 100,000 which was identified as the receptor by affinity labeling with 125I-labeled neurotensin in the presence of disuccinimidyl suberate. The purity of the mouse brain receptor eluted from the affinity column was estimated to be 78%. Electroelution of the 100-kDa protein band gave an homogenous preparation of receptor. Very similar results were obtained with CHAPS-solubilized neurotensin receptors from rat and rabbit brain.

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Accession: 007710343

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Related references

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