Abstract:
:Phosphoproteins produced by the incubation of crude extracts of Salmonella typhimurium and Escherichia coli with either [32P]phosphoenolpyruvate or [gamma 32P]ATP have been resolved and detected using sodium dodecyl sulphate polyacrylamide gel electrophoresis and autoradiography. Simple techniques were found such that distinctions could be made between phosphoproteins containing acid-labile or stable phosphoamino acids and between N1-P-histidine and N3-P-histidine. Phosphoproteins were found to be primarily formed from phosphoenolpyruvate, but because of an efficient phosphoexchange, ATP also led to the formation of the major phosphoenolpyruvate-dependent phosphoproteins. These proteins had the following apparent subunit molecular weights: 65,000, 65,000, 62,000, 48,000, 40,000, 33,000, 25,000, 20,000, 14,000, 13,000, 9,000, 8,000. Major ATP-dependent phosphoproteins were detected with apparent subunit molecular weights of 75,000, 46,000, 30,000, and 15,000. Other minor phosphoproteins were detected. The phosphorylation of the 48,000- and 25,000-MW proteins by phosphoenolpyruvate was independent of the phosphoenolpyruvate:sugar phosphotransferase system (PTS). The PTS phosphoproteins were identified as enzyme I (soluble; MW = 65,000); enzyme IIN-acetylglucosamine (membrane bound; MW = 65,000); enzyme IImannitol (membrane bound; MW = 62,000); IIIfructose (soluble; MW = 40,000); IIImannose (partially membrane associated; MW = 33,000); IIIglucose (soluble; MW = 20,000); IIIglucitol (soluble; MW = 13-14,000); HPr (soluble; MW = 9,000); FPr (fructose induced HPr-like protein (soluble; MW = 8,000). HPr and FPr are phosphorylated on the N-1 position of a histidyl residue while all the others appear to be phosphorylated on an N-3 position of a histidyl residue. These studies identify some previously unknown proteins of the PTS and show the phosphorylation of others, which although previously known, had not been shown to be phosphoproteins.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Waygood EB,Mattoo RL,Peri KGdoi
10.1002/jcb.240250304subject
Has Abstractpub_date
1984-01-01 00:00:00pages
139-59issue
3eissn
0730-2312issn
1097-4644journal_volume
25pub_type
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