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Default Secondary structure of the phosphocarrier protein IIIGlc, a signal-transducing protei

Secondary structure of the phosphocarrier protein IIIGlc, a signal-transducing protein from Escherichia coli, determined by heteronuclear three-dimensional NMR spectroscopy.

Related Articles Secondary structure of the phosphocarrier protein IIIGlc, a signal-transducing protein from Escherichia coli, determined by heteronuclear three-dimensional NMR spectroscopy.

Proc Natl Acad Sci U S A. 1991 Apr 15;88(8):3479-83

Authors: Pelton JG, Torchia DA, Meadow ND, Wong CY, Roseman S

IIIGlc is a signal-transducing phosphocarrier protein of the phosphoenolpyruvate:glycose phosphotransferase system of Escherichia coli. The secondary structure of IIIGlc is determined by heteronuclear (15N, 13C) three-dimensional NMR spectroscopy. Sequential, medium-range, and long-range nuclear Overhauser effects seen in NMR spectra are used to elucidate 11 antiparallel beta-strands and four helical segments. The medium-range nuclear Overhauser effect patterns suggest that the helices are either distorted alpha-helices or are of the 3(10) class. The amino acids separating the active-site histidine residues (His75 and His90) form two strands (Ala76-Ser81 and Val85-Phe91) of a six-stranded antiparallel beta-sheet that brings His90 and His75 in close proximity. Sequence similarities in IIIGlc and several other sugar-transport proteins suggest that the histidine residues within these proteins may be arranged in a similar manner. The 18-residue N-terminal peptide that precedes beta-strand Thr19-Ile22 in native IIIGlc is disordered and does not interact with the rest of the protein. Furthermore, removal of the N-terminal heptapeptide by a specific endopeptidase does not affect the structure of the remaining protein, thus explaining the phospho-acceptor activity of modified IIIGlc with the phospho-histidine-containing phosphocarrier protein of this system.

PMID: 2014267 [PubMed - indexed for MEDLINE]



Source: PubMed
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