Protein Family Models

In the E. coli cytosol, a fraction of the newly synthesised proteins requires the activity of molecular chaperones for folding to the native state. The major chaperones implicated in this folding process are the ribosome-associated Trigger Factor (TF), and the DnaK and GroEL chaperones with their respective co-chaperones. Trigger Factor is an ATP-independent chaperone and displays chaperone and peptidyl-prolyl-cis-trans-isomerase (PPIase) activities in vitro. It is composed of three domains, an N-terminal domain which mediates association with the large ribosomal subunit (ribosome-binding domain, RBD), a central PPIase domain with homology to FKBP proteins, and a C-terminal substrate-binding domain (SBD) which forms the central body of the protein and has two helical arms that create a cavity [1,2]. The association between its N-terminal domain with the ribosomal protein L23 located next to the peptide tunnel exit is essential for the interaction with nascent polypeptides and its in vivo function [1]. This entry represents the C-terminal region of TF which has a multi-helical structure consisting of an irregular array of long and short helices structurally similar to the peptide-binding domain of the bacterial porin chaperone SurA [3]. [1]. 12603737. Trigger Factor and DnaK possess overlapping substrate pools and. binding specificities.. Deuerling E, Patzelt H, Vorderwulbecke S, Rauch T, Kramer G,. Schaffitzel E, Mogk A, Schulze-Specking A, Langen H, Bukau B;. Mol Microbiol 2003;47:1317-1328.. [2]. 29222465. The dynamic dimer structure of the chaperone Trigger Factor.. Morgado L, Burmann BM, Sharpe T, Mazur A, Hiller S;. N. TRUNCATED at 1650 bytes (from Pfam)

Date:

2024-08-14

In the E. coli cytosol, a fraction of the newly synthesised proteins requires the activity of molecular chaperones for folding to the native state. The major chaperones implicated in this folding process are the ribosome-associated Trigger Factor (TF), and the DnaK and GroEL chaperones with their respective co-chaperones. Trigger Factor is an ATP-independent chaperone and displays chaperone and peptidyl-prolyl-cis-trans-isomerase (PPIase) activities in vitro. It is composed of at least three domains, an N-terminal domain which mediates association with the large ribosomal subunit, a central substrate binding and PPIase domain with homology to FKBP proteins, and a C-terminal domain of unknown function. The positioning of TF at the peptide exit channel, together with its ability to interact with nascent chains as short as 57 residues renders TF a prime candidate for being the first chaperone that binds to the nascent polypeptide chains [1]. This family represents the N-terminal region of the protein. [1]. 12603737. Trigger Factor and DnaK possess overlapping substrate pools and. binding specificities.. Deuerling E, Patzelt H, Vorderwulbecke S, Rauch T, Kramer G,. Schaffitzel E, Mogk A, Schulze-Specking A, Langen H, Bukau B;. Mol Microbiol 2003;47:1317-1328. (from Pfam)

Date:

2024-08-14

Date:

2024-08-14

Trigger factor is a ribosome-associated molecular chaperone and is the first chaperone to interact with nascent polypeptide. Trigger factor can bind at the same time as the signal recognition particle (SRP), but is excluded by the SRP receptor (FtsY). The central domain of trigger factor has peptidyl-prolyl cis/trans isomerase activity. This protein is found in a single copy in virtually every bacterial genome.

Gene:

tig

Date:

2024-06-12