Synthesis and conformational studies of peptides encompassing the carboxy-terminal helix of thermolysin.
Synthesis and conformational studies of peptides encompassing the carboxy-terminal helix of thermolysin.
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包含嗜热菌蛋白酶羧基末端螺旋的肽的合成和构象研究。
DOI:
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
A. Fontana
中科院分区:
文献类型:
--
作者:
C. Vita;D. Dalzoppo;Vincenzo Filippis;R. Longhi;E. Manera;P. Pucci;A. Fontana
The 21-residue fragment Tyr-Gly-Ser-Thr-Ser-Gln-Glu-Val-Ala-Ser-Val-Lys-Gln-Ala-Phe-Asp-Ala-Val- Gly-Val-Lys, corresponding to sequence 296-316 of thermolysin and thus encompassing the COOH-terminal helical segment 301-312 of the native protein, was synthesized by solid-phase methods and purified to homogeneity by reverse-phase high performance liquid chromatography. The peptide 296-316 was then cleaved with trypsin at Lys307 and Staphylococcus aureus V8 protease at Glu302, producing the additional fragments 296-307, 308-316, 296-302, and 303-316. All these peptides, when dissolved in aqueous solution at neutral pH, are essentially structureless, as determined by circular dichroism (CD) measurements in the far-ultraviolet region. On the other hand, fragment 296-316, as well as some of its proteolytic fragments, acquires significant helical conformation when dissolved in aqueous trifluoroethanol or ethanol. In general, the peptides mostly encompassing the helical segment 301-312 in the native thermolysin show helical conformation in aqueous alcohol. In particular, quantitative analysis of CD data indicated that fragment 296-316 attains in 90% aqueous trifluoroethanol the same percentage (approximately 58%) of helical secondary structure of the corresponding chain segment in native thermolysin. These results indicate that peptide 296-316 and its subfragments are unable to fold into a stable native-like structure in aqueous solution, in agreement with predicted location and stabilities of isolated subdomains of the COOH-terminal domain of thermolysin based on buried surface area calculations of the molecule.
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影响因子:
2.9
作者:
Wright,PE;Dyson,HJ;Lerner,RA
通讯作者:
Lerner,RA
影响因子:
2.9
作者:
Michael H. Zehfus;George D. Rose
通讯作者:
Michael H. Zehfus;George D. Rose
影响因子:
5.6
作者:
DYSON, HJ;RANCE, M;LERNER, RA
通讯作者:
LERNER, RA
影响因子:
2.9
作者:
Strehlow,KG;Baldwin,RL
通讯作者:
Baldwin,RL
DOI:
10.1073/pnas.84.24.8898
发表时间:
1987-12-01
影响因子:
11.1
作者:
MARQUSEE, S;BALDWIN, RL
通讯作者:
BALDWIN, RL