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Structure of human salivary histatin 5 in aqueous and nonaqueous solutions

✍ Scribed by Periathamby Antony Raj; Emil Marcus; Dinesh K. Sukumaran

Publisher
Wiley (John Wiley & Sons)
Year
1998
Tongue
English
Weight
656 KB
Volume
45
Category
Article
ISSN
0006-3525

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✦ Synopsis

was examined in water (pH 3.8) and dimethyl sulfoxide solutions using 500 MHz homo-and heteronuclear two-dimensional (2D) nmr. The resonance assignment of peptide backbone and side-chain protons was accomplished by 2D total correlated spectroscopy and nuclear Overhauser effect (NOE) spectroscopy. The high J NH-C a H values (¢7.4 Hz), absence of any characteristic NH-NH(i, i / 1) or C a H-C b H(i, i / 3) NOE connectivities, high dd/dT values (¢0.004 ppm K 01 ) and the fast 1 H/ 2 H amide exchange suggest that histatin 5 molecules remain unstructured in aqueous solution at pH 3.8. In contrast, histatin 5 prefers

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