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nmrlearner 08-21-2010 11:12 PM

Sequence-specific 1H-NMR assignments and secondary structure of the lipoyl domain of
 
Sequence-specific 1H-NMR assignments and secondary structure of the lipoyl domain of the Bacillus stearothermophilus pyruvate dehydrogenase multienzyme complex.

http://www.ncbi.nlm.nih.gov/corehtml...REE_120x27.gif Related Articles Sequence-specific 1H-NMR assignments and secondary structure of the lipoyl domain of the Bacillus stearothermophilus pyruvate dehydrogenase multienzyme complex.

Eur J Biochem. 1991 Oct 1;201(1):203-9

Authors: Dardel F, Laue ED, Perham RN

The lipoyl domain (residues 1-85) of the lipoate-acetyltransferase polypeptide chain of the pyruvate dehydrogenase multienzyme complex of Bacillus stearothermophilus has been subjected to detailed structural analysis by means of two-dimensional (2D) 1H-NMR spectroscopy at 400 MHz. Sequence-specific proton resonance assignments were made, but at this field strength not all of the side-chain protons could be assigned, especially from complex spin systems like those of leucine, proline and lysine residues. Measurement of short-range interproton distances identified two extensive regions of beta-sheet, each containing four anti-parallel peptide strands. The lipoyl-lysine residue (Lys42) is located in a tight turn at a corner of one sheet, the N-terminal and C-terminal residues of the domain are close together in two adjacent beta-strands in the other. The lipoylated and unlipoylated forms of the domain have almost identical spectra, indicating that there is little, if any, conformational change in the protein as a result of the post-translational modification.

PMID: 1915365 [PubMed - indexed for MEDLINE]



Source: PubMed


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