C-terminal 13-residue Truncation Induces Compact Trigger Factor Conformation and Severely Impairs its Dimerization Ability

Author(s): Yi Shi, Ling Yu, Hiroshi Kihara, Jun-Mei Zhou.

Journal Name: Protein & Peptide Letters

Volume 21 , Issue 5 , 2014

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Abstract:

Trigger factor (TF) is the first chaperone to interact with nascent chains and facilitate their folding within bacteria. TF possesses a three-state equilibrium in vivo: monomeric TF bound to ribosome, free monomeric, and dimeric TF in cytoplasm. TF consists of an N-terminal ribosome binding domain, a middle peptidyl–prolyl cis/trans isomerase (PPIase) domain and a C-terminal domain involved in substrate binding and dimerization. Investigation of the effect of C-terminal 13 region on TF structure and function will help to further the understanding of its mechanism as a chaperone in vitro and in vivo. Here we present TF419, a TF mutant from which the C-terminal 13 residues were deleted to investigate the role of these residues in the structure stability and function of intact molecules. Small angle X-ray scattering (SAXS), fluorescence measurements and limited proteolysis results suggested that TF transitioned to a compact conformation when the Cterminal 13 residues were truncated. Further biochemical results reveal that TF dimerization was decreased as a result of the truncation. These results suggested that the C-terminal 13 residues play an important role in structural stability and chaperone function of TF.

Keywords: C-terminal truncation, dimerization, molecular chaperone, small angle X-ray scattering, trigger factor.

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Article Details

VOLUME: 21
ISSUE: 5
Year: 2014
Page: [476 - 482]
Pages: 7
DOI: 10.2174/092986652105140218114955
Price: $65

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