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S6 permutein shows that the unusual target topology is not responsible for the absence of rigid tertiary structure in de novo protein albebetin
Author(s) -
Ziedulla Abdullaev,
Ramil F. Latypov,
Azat Ya. Badretdinov,
Д. А. Долгих,
Alan Finkelstein,
Vladimir N. Uversky,
Mikhaǐl P. Kirpichnikov
Publication year - 1997
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(97)01042-9
Subject(s) - thermus thermophilus , protein tertiary structure , circular dichroism , protein secondary structure , chemistry , topology (electrical circuits) , crystallography , escherichia coli , gene , biology , stereochemistry , biochemistry , mathematics , combinatorics
Ribosomal protein S6 from Thermus thermophilus was modified to form the unusual unique topology designed earlier for a de novo protein albebetin. The S6 gene was cloned, sequenced and circularly permutated by means of genetic engineering methods. The permutated gene was expressed in Escherichia coli and the permutein was isolated and investigated by means of circular dichroism, fluorescence spectroscopy and scanning microcalorimetry. The permutated protein revealed a pronounced secondary structure close to that of the wild type S6 protein and a rigid tertiary structure possessing cooperative temperature melting. It means that the unusual new topology of albebetin is compatible with a rigid tertiary structure, it may be realized in natural proteins and it is not responsible for the absence of rigid structure in albebetin.