2017  0,977
2016  0,799
2015  0,662
2014  0,740
2013  0,739
2012  0,637
2011  0,658
2010  0,654
2009  0,570
2008  0,849
2007  0,805
2006  0,330
2005  0,435
2004  0,623
2003  0,567
2002  0,641
2001  0,490
2000  0,477
1999  0,762
1998  0,785
1997  0,507
1996  0,518
1995  0,502
Vol 52(2018) N 1 p. 69-74; DOI 10.1134/S0026893318010107 Full Text

V.V. Marchenkov1, N.V. Kotova1, T.A. Muranova2, G.V. Semisotnov1*

Limited Trypsinolysis of GroES: The Effect on the Interaction with GroEL and Assembly In Vitro

1Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290 Russia
2Branch of the Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290 Russia

Received - 2017-06-28; Accepted - 2017-07-10

GroES is a heptameric partner of tetradecameric molecular chaperone GroEL, which ensures the correct folding and assembly of numerous cellular proteins both in vitro and in vivo. This work demonstrates the results of a study of structural aspects of GroES that affect its interaction with GroEL and reassembly. The effect of limited trypsinolysis of GroES on these processes has been studied. It has been shown that limited trypsinolysis of GroES is only strongly pronounced outside the complex with GroEL and results in the cleavage of the peptide bond between Lys20 and Ser21. The N-terminal fragment (~2 kDa) is retained in the GroES particle, which maintains its heptaoligomeric structure but loses the ability to interact with GroEL and dissociates upon a change in the pH from 7 to 8. Trypsin-nicked GroES cannot reassemble after urea-induced unfolding, while the urea-induced unfolding of intact GroES is fully reversible. The reported results indicate the important role of the N-terminal part of GroES subunit in the assembly of its heptameric structure and the interaction with GroEL.

oligomeric protein assembly, GroES chaperonin, limited trypsinolysis