Abstract
Torpedo californica acetylcholine receptor (AcChR) enriched, sealed vesicles have been specifically labeled on the cytoplasmic surface with pyridoxal 5′-phosphate (Perez-Ramirez, B., and Martinez-Carrion, M., 1989,Biochemistry 28, 5034–5040). After chromatography of the peptide fragments produced by tryptin digestion of labeled AcChR, several fractions containing the phosphopyridoxyl label were obtained. Edman degradation identified one of the fractions, with sequence SRSELMFEKQSER, as corresponding to residues 377–389 in theδ subunit (primary structure). The latter must be a cytoplasmic region of this transmembranous protein, and residueδK385 must reside in a water-soluble exposed domain of the cytosolic side of the membrane. Introduction of phosphopyridoxyl residues allows for their potential use as probes of conformational changes in the cytosolic surface of the receptor molecule.
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Abbreviations
- AcChR:
-
acetylcholine receptor
- PLP:
-
pyridoxal 5′-phosphate
- PNP:
-
pyridoxine 5′-phosphate
- α-Bgt:
-
α-bungarotoxin
- OG:
-
Β-D-octylglucopyranoside
- TPCK:
-
N-tosyl-L-phenylalanine chloromethyl ketone
- TFA:
-
trifluoroacetic acid
- HPLC:
-
high-performance liquid chromatography
- RP-HPLC:
-
reversed-phase high-performance liquid chromatography
- HEPES:
-
N-[2-hydroxyethyl]piperazine-N′-[2-ethanesulfonic acid]
- PBS:
-
10 mM sodium phosphate, pH 7.5, 100 mM NaCl
- SDS-PAGE:
-
sodium dodecyl sulfate polyacrylamide gel electrophoresis
- PTH:
-
phenylthiohydantoin
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Perez-Ramirez, B., Iriarte, A. & Martinez-Carrion, M. Residues 377-389 from the δ subunit ofTorpedo californica acetylcholine receptor are located in the cytoplasmic surface. J Protein Chem 13, 67–76 (1994). https://doi.org/10.1007/BF01891994
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DOI: https://doi.org/10.1007/BF01891994