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Default 1H NMR and circular dichroism studies of the N-terminal domain of cyclic GMP dependen

1H NMR and circular dichroism studies of the N-terminal domain of cyclic GMP dependent protein kinase: a leucine/isoleucine zipper.

Related Articles 1H NMR and circular dichroism studies of the N-terminal domain of cyclic GMP dependent protein kinase: a leucine/isoleucine zipper.

Biochemistry. 1991 Oct 1;30(39):9387-95

Authors: Atkinson RA, Saudek V, Huggins JP, Pelton JT

Cyclic GMP dependent protein kinase exists as a dimer in its native form. A peptide corresponding to the dimerization domain in the N-terminal segment has been characterized by circular dichroism, ultracentrifugation, and 1H NMR spectroscopy. The peptide (G-kinase1-39 amide) is shown to be dimeric in solution. Determination of the molecular weight of the species in solution from the sedimentation coefficient and diffusion coefficient yields a value more than twice that of the monomeric species. Circular dichroism studies show G-kinase1-39 amide to be largely helical in aqueous solution and stable over a wide range of pH and temperature. The conformational stability is found to be concentration dependent, the peptide having a melting temperature of 75 degrees C (at 20 microM and pH 4.0). The assignment of the 1H NMR spectrum and analysis of the patterns of nuclear Overhauser enhancements confirm the helical nature of the conformation. Distance geometry calculations result in a well-defined helical structure containing a kink near Ser 26. The dimerization of G-kinase is most likely to occur through the hydrophobic interaction of leucine and isoleucine side chains located on one face of a helical structure with supporting electrostatic interactions between flanking side chains. The dimerization domain of G-kinase is clearly analogous to the "leucine zipper" motifs found in a number of DNA transcriptional activators.

PMID: 1892839 [PubMed - indexed for MEDLINE]



Source: PubMed
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