NDLI: Identification of protein kinase A phosphorylation sites on NBD1 and R domains of CFTR using electrospray mass spectrometry with selective phosphate ion monitoring.

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Identification of protein kinase A phosphorylation sites on NBD1 and R domains of CFTR using electrospray mass spectrometry with selective phosphate ion monitoring.

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Identification of protein kinase A phosphorylation sites on NBD1 and R domains of CFTR using electrospray mass spectrometry with selective phosphate ion monitoring.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Verkman, A. S. Lipniunas, P. H. Townsend, R. R. Tulk, B. M.
Description	Country affiliation: United States Author Affiliation: Townsend RR ( Department of Pharmaceutical Chemistry, University of California, San Francisco 94143, USA. rrtown@itsa.ucsf.edu)
Abstract	HPLC-electrospray mass spectrometry was used to identify the phosphorylated sites on a bacterially expressed cystic fibrosis transmembrane conductance regulator (CFTR) fragment containing the first nucleotide binding domain (NBD1) and the regulatory domain (R). Tryptic digests of NBD1-R (CFTR residues 404-830) were analyzed after protein kinase A (PKA) treatment for all possible peptides and phosphopeptides (a total of 118 species) containing Ser residues within 'high-probability' PKA consensus sequences: R-R/K-X-S/T, R-X-X-S/T, and R-X-S/T. Three criteria were used to assign phosphorylated sites: (1) an 80-Da increase in the predicted average molecular weight of the tryptic peptides; (2) co-elution with the PO3- ion induced by stepped energy collision; and (3) the relative elution positions of the phosphorylated and unmodified peptides. Ser residues within the eight dibasic sites in the NBD1 and R domains (positions 422, 660, 700, 712, 737, 768, 795, and 813) were phosphorylated, a pattern similar to that observed for full-length CFTR. The serine at position 753, which in CFTR is phosphorylated in vivo, was not phosphorylated. The remaining potential PKA sites, Ser489, Ser519, Ser557, Ser670, and Thr788, were not phosphorylated. The 'low-probability' PKA sites (those not containing an Arg residue) were not phosphorylated. The results suggest that isolated domains of CFTR developed useful models for investigating the biochemical and structural effects of phosphorylation within CFTR. The mass spectrometry approach in this study should prove useful for defining phosphorylation sites of CFTR in vitro and in vivo.
ISSN	09618368
e-ISSN	1469896X
Journal	Protein Science
Issue Number	9
Volume Number	5
Language	English
Publisher	Wiley-Blackwell (on behalf of The Protein Society)
Publisher Date	1996-09-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Cyclic Amp-dependent Protein Kinases Metabolism Cystic Fibrosis Transmembrane Conductance Regulator Chemistry Peptide Fragments Amino Acid Sequence Binding Sites Consensus Sequence Molecular Sequence Data Phosphorylation Protein Structure, Secondary Recombinant Proteins Trypsin Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, P.h.s. Discipline Biochemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Biology Biochemistry

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