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. 1988 Feb;86(2):512–516. doi: 10.1104/pp.86.2.512

Isolation and Sequence of Tryptic Peptides from the Proton-Pumping ATPase of the Oat Plasma Membrane 1

G Eric Schaller 1, Michael R Sussman 1
PMCID: PMC1054515  PMID: 16665938

Abstract

In crude extracts of plant tissue, the Mr = 100,000 proton-pumping ATPase constitutes less than 0.01% of the total cell protein. A large-scale purification procedure is described that has been used to obtain extensive protein sequence information from this enzyme. Plasma membrane vesicles enriched in ATPase activity were obtained from extracts of oat roots by routine differential and density gradient centrifugation. Following a detergent wash, the ATPase was resolved from other integral membrane proteins by size fractionation at 4°C in the presence of lithium dodecyl sulfate. After carboxymethylation of cysteine residues and removal of detergent, the ATPase was digested with trypsin and resultant peptide fragments separated by reverse phase high performance liquid chromatography. Peptides were recovered with high yield and were readily sequenced by automated Edman degradation on a gas-phase sequencer. Of the eight peptides sequenced, six showed strong homology with known amino acid sequences of the fungal proton-pumping and other cation-transporting ATPases.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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