N.m.r. analyses of the histidine microenvironments in a human salivary proline-rich glycoprotein.
N.m.r. analyses of the histidine microenvironments in a human salivary proline-rich glycoprotein.
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N.m.r.
DOI:
10.1111/j.1399-3011.1988.tb00672.x
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发表时间:
1988
期刊:
影响因子:
--
通讯作者:
Levine,MJ
中科院分区:
文献类型:
--
作者:
Loomis,RE;Tseng,CC;Levine,MJ
The pKa's of the three histidine residues in a proline‐rich glycoprotein from human parotid saliva (PRG) were determined by 360 MHz proton n.m.r. spectroscopy. The addition of calcium (0.64 mm) caused drops in the pKa's of all three histidines by ∼0.25 units. When imidazole and cyclo(l‐histidine‐l‐proline) were used as model compounds, corresponding concentrations of calcium had no effect on their pKa's. Also, the model compounds gave absolute pKavalues in good agreement with similar chemical species reported in the literature. Exchange lifetime data and previously reported hydrogen → deuterium exchange experiments suggest that the PRG histidine NtH protons are not involved in hydrogen‐bonds. Collectively, these data imply that changes in PRG conformation occur upon the addition of calcium.
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DOI:
--
发表时间:
1969
期刊:
Biochimica et Biophysica Acta
影响因子:
--
作者:
Michael J. Levine;J. Weill;S. A. Ellison
通讯作者:
S. A. Ellison
DOI:
10.1042/bj2340043
发表时间:
1986
期刊:
The Biochemical journal
影响因子:
--
作者:
Bergey,EJ;Levine,MJ;Reddy,MS;Bradway,SD;Al-Hashimi,I
通讯作者:
Al-Hashimi,I
DOI:
--
发表时间:
1985
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Maeda,N;Kim,HS;Azen,EA;Smithies,O
通讯作者:
Smithies,O
DOI:
10.1016/0006-291x(82)91331-6
发表时间:
1982
影响因子:
3.1
作者:
Reddy,MS;Levine,MJ;Tabak,LA
通讯作者:
Tabak,LA
DOI:
--
发表时间:
1978
期刊:
影响因子:
--
作者:
TanokuraMasaru;TasumiMitsuo;MiyazawaTatsuo
通讯作者:
MiyazawaTatsuo