Naslov
The proximal region of a noncatalytic eukaryotic seryl-tRNA synthetase extension is required for protein stability in vitro and in vivo

Autori
Močibob, Marko ; Weygand-Đurašević, Ivana

Izvornik
Archives of Biochemistry and Biophysics (0003-9861) 470 (2008), 2; 129-138

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Seryl-tRNA synthetase; aaRS extensions; SerRS stability; aaRS-interacting protein; Peroxin

Sažetak
Eukaryotic cytosolic seryl-tRNA synthetases (SerRS) have idiosyncratic C-terminal extensions not present in prokaryotic counterparts. The extensions of two eukaryotic SerRSs were subjected to mutagenesis and partial truncation. Only minor parts of the yeast or maize SerRS extensions, adjacent to the catalytic core (7 of 20 and 8 of 26 amino acids, respectively), were found to be indispensable for protein stability. Truncated proteins with substantially shortened extensions displayed unaltered catalytic properties and could complement a Saccharomyces cerevisiae strain with a disrupted SerRS gene, if these proximal regions were left intact. Although the yeast C-terminal SerRS extension is required for Pex21p binding, the maize counterpart with an appended yeast SerRS extension remained incapable of Pex21p binding, implying that additional regions of yeast SerRS may also contribute to the interaction with the peroxin. The proximal region of the eukaryotic SerRS C-terminal extension is indispensable for protein stability, while the remaining part of the extension remains available for other functions, such as species-specific protein:protein interactions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Biologija

POVEZANOST RADA