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#chaperone system

3 public questions tagged with this topic.

Microbial Physiology

The DnaK/DnaJ/GrpE chaperone system is responsible for:

Hsp70 chaperone system DnaK-DnaJ-GrpE is highly conserved ATP-dependent folding machine from bacteria to humans. DnaK N-terminal ATPase domain linked to substrate-binding domain exists in ATP-bound low-affinity open state with rapid substrate exchange. DnaJ Hsp40 cochaperone with J-domain delivers unfolded proteins exposing hydrophobic patches and potently stimulates ATP hydrolysis via HPD motif interaction, converting DnaK to ADP-bound high-affinity closed state that tightly clamps onto extended segment of about seven residues enriched in leucine and isoleucine. GrpE dimeric nucleotide exchan

Ref: Alberts et al., Molecular Biology of the Cell, 7th ed., Chapter 7: DnaK-DnaJ-GrpE Chaperone System in Protein Refolding.

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Protein

The Hsp70 chaperone system binds to:

Newly synthesized polypeptides accurately identifies the binding site, binding partner, or molecular interaction described in this question. In Protein Folding, molecular recognition and binding specificity are governed by complementary shape, charge, and hydrophobic interactions between molecules. Newly synthesized polypeptides binds at the specified location due to its structural complementarity and specific non-covalent or covalent interactions. The other options (Fully folded proteins, Misfolded protein aggregates, and Lipid membranes) describe binding to different sites, involve different

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 4

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Protein

Which chaperone system is responsible for assisting protein folding in bacteria?

GroEL-GroES is the scientifically accurate answer to this question. Within the study of Protein Folding, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of GroEL-GroES directly address what is being asked. Among the other options, Hsp70, Hsp90, and Calnexin do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 4

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