The Membrane-Associated Protein-Serine/Threonine Kinase from Sulfolobus solfataricus Is a Glycoprotein

作者: Brian H. Lower , Peter J. Kennelly

DOI: 10.1128/JB.184.10.2614-2619.2002

关键词: AutophosphorylationBiologyProtein kinase Ac-RafProtein kinase CMAP2K7Serine/threonine-specific protein kinaseMolecular biologyBiochemistryReceptor protein serine/threonine kinaseSulfolobus solfataricus

摘要: Treatment of a sodium dodecyl sulfate-polyacrylamide gel with periodic acid-Schiff (PAS) stain or blotting Galanthus nivalis agglutinin revealed the presence several glycosylated polypeptides in partially purified detergent extract membrane fraction Sulfolobus solfataricus. One glycoproteins comigrated membrane-associated protein-serine/threonine kinase from S. solfataricus, which had been radiolabeled by autophosphorylation [32P]ATP vitro. chemical deglycosylating agent, trifluoromethanesulfonic acid, abolished PAS staining and reduced Mr protein ∼67,000 to ∼62,000. Protein activity also adhered to, could be eluted from, agarose beads containing bound G. agglutinin. Glycosylation implies that at least portion this integral resides on external surface cell membrane.

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