Periplasmic chaperones: outer membrane biogenesis and envelope stress

AN Combs, TJ Silhavy - Annual Review of Microbiology, 2024 - annualreviews.org
Envelope biogenesis and homeostasis in gram-negative bacteria are exceptionally intricate
processes that require a multitude of periplasmic chaperones to ensure cellular survival …

ATP-independent chaperones

R Mitra, K Wu, C Lee… - Annual Review of …, 2022 - annualreviews.org
The folding of proteins into their native structure is crucial for the functioning of all biological
processes. Molecular chaperones are guardians of the proteome that assist in protein …

Structural transitions modulate the chaperone activities of Grp94

YS Amankwah, Y Fleifil, E Unruh… - Proceedings of the …, 2024 - National Acad Sciences
Hsp90s are ATP-dependent chaperones that collaborate with co-chaperones and Hsp70s to
remodel client proteins. Grp94 is the ER Hsp90 homolog essential for folding multiple …

Trigger factor both holds and folds its client proteins

K Wu, TC Minshull, SE Radford, AN Calabrese… - Nature …, 2022 - nature.com
ATP-independent chaperones like trigger factor are generally assumed to play passive roles
in protein folding by acting as holding chaperones. Here we show that trigger factor plays a …

Universal protein misfolding intermediates can bypass the proteostasis network and remain soluble and less functional

DA Nissley, Y Jiang, F Trovato, I Sitarik… - Nature …, 2022 - nature.com
Some misfolded protein conformations can bypass proteostasis machinery and remain
soluble in vivo. This is an unexpected observation, as cellular quality control mechanisms …

The interactions of molecular chaperones with client proteins: why are they so weak?

T Arhar, A Shkedi, CM Nadel, JE Gestwicki - Journal of Biological Chemistry, 2021 - ASBMB
The major classes of molecular chaperones have highly variable sequences, sizes, and
shapes, yet they all bind to unfolded proteins, limit their aggregation, and assist in their …

Stress-responsive periplasmic chaperones in bacteria

H Kim, K Wu, C Lee - Frontiers in Molecular Biosciences, 2021 - frontiersin.org
Periplasmic proteins are involved in a wide range of bacterial functions, including motility,
biofilm formation, sensing environmental cues, and small-molecule transport. In addition, a …

G-quadruplexes rescuing protein folding

A Son, V Huizar Cabral, Z Huang… - Proceedings of the …, 2023 - National Acad Sciences
Maintaining the health of the proteome is a critical cellular task. Recently, we found G-
quadruplex (G4) nucleic acids are especially potent at preventing protein aggregation in …

Molecular mechanisms of chaperone‐directed protein folding: Insights from atomistic simulations

M Castelli, A Magni, G Bonollo, S Pavoni… - Protein …, 2024 - Wiley Online Library
Molecular chaperones, a family of proteins of which Hsp90 and Hsp70 are integral
members, form an essential machinery to maintain healthy proteomes by controlling the …

Mechanism of the small ATP-independent chaperone Spy is substrate specific

R Mitra, VV Gadkari, BA Meinen… - Nature …, 2021 - nature.com
ATP-independent chaperones are usually considered to be holdases that rapidly bind to
non-native states of substrate proteins and prevent their aggregation. These chaperones are …