Isolation, purification, and partial characterization of a membrane-bound Cl
-/HCO
3--activated ATPase complex from rat brain with sensitivity to GABA
Aergic ligands.
Prep Biochem Biotechnol 2016;
47:151-157. [PMID:
27191193 DOI:
10.1080/10826068.2016.1188312]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
This study describes the isolation and purification of a protein complex with [Formula: see text]-ATPase activity and sensitivity to GABAAergic ligands from rat brain plasma membranes. The ATPase complex was enriched using size-exclusion, affinity, and ion-exchange chromatography. The fractions obtained at each purification step were subjected to SDS-polyacrylamide gel electrophoresis (SDS-PAGE), which revealed four subunits with molecular mass ∼48, 52, 56, and 59 kDa; these were retained at all stages of the purification process. Autoradiography revealed that the ∼52 and 56 kDa subunits could bind [3H]muscimol. The [Formula: see text]-ATPase activity of this enriched protein complex was regulated by GABAAergic ligands but was not sensitive to blockers of the NKCC or KCC cotransporters.
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