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TitleVisualizing the chaperone-mediated folding trajectory of the G protein β5 β-propeller.
Journal, issue, pagesMol Cell, Vol. 83, Issue 21, Page 3852-33868.e6, Year 2023
Publish dateNov 2, 2023
AuthorsShuxin Wang / Mikaila I Sass / Yujin Kwon / W Grant Ludlam / Theresa M Smith / Ethan J Carter / Nathan E Gladden / Margot Riggi / Janet H Iwasa / Barry M Willardson / Peter S Shen /
PubMed AbstractThe Chaperonin Containing Tailless polypeptide 1 (CCT) complex is an essential protein folding machine with a diverse clientele of substrates, including many proteins with β-propeller domains. Here, ...The Chaperonin Containing Tailless polypeptide 1 (CCT) complex is an essential protein folding machine with a diverse clientele of substrates, including many proteins with β-propeller domains. Here, we determine the structures of human CCT in complex with its accessory co-chaperone, phosducin-like protein 1 (PhLP1), in the process of folding Gβ, a component of Regulator of G protein Signaling (RGS) complexes. Cryoelectron microscopy (cryo-EM) and image processing reveal an ensemble of distinct snapshots that represent the folding trajectory of Gβ from an unfolded molten globule to a fully folded β-propeller. These structures reveal the mechanism by which CCT directs Gβ folding through initiating specific intermolecular contacts that facilitate the sequential folding of individual β sheets until the propeller closes into its native structure. This work directly visualizes chaperone-mediated protein folding and establishes that CCT orchestrates folding by stabilizing intermediates through interactions with surface residues that permit the hydrophobic core to coalesce into its folded state.
External linksMol Cell / PubMed:37852256 / PubMed Central
MethodsEM (single particle)
Resolution2.7 - 3.7 Å
Structure data

EMDB-40439, PDB-8sfe:
Open state CCT-G beta 5 complex
Method: EM (single particle) / Resolution: 3.36 Å

EMDB-40440, PDB-8sff:
CCT G beta 5 complex closed state 0
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-40452, PDB-8sg8:
CCT G beta 5 complex closed state 1
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-40453, PDB-8sg9:
CCT G beta 5 complex closed state 3
Method: EM (single particle) / Resolution: 2.9 Å

EMDB-40454, PDB-8sgc:
CCT G beta 5 complex closed state 2
Method: EM (single particle) / Resolution: 2.9 Å

EMDB-40461, PDB-8sgl:
CCT G beta 5 complex closed state 15
Method: EM (single particle) / Resolution: 2.9 Å

EMDB-40464, PDB-8sgq:
CCT G beta 5 complex intermediate state
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-40481, PDB-8sh9:
CCT G beta 5 complex best PhLP1 class
Method: EM (single particle) / Resolution: 2.7 Å

EMDB-40482, PDB-8sha:
CCT-G beta 5 complex closed state 4
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-40484, PDB-8shd:
CCT G beta 5 complex closed state 10
Method: EM (single particle) / Resolution: 2.9 Å

EMDB-40485, PDB-8she:
CCT-G beta 5 complex closed state 8
Method: EM (single particle) / Resolution: 2.8 Å

EMDB-40486, PDB-8shf:
CCT-G beta 5 complex closed state 7
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-40487, PDB-8shg:
CCT G beta 5 complex closed state 9
Method: EM (single particle) / Resolution: 2.8 Å

EMDB-40488, PDB-8shl:
CCT G beta 5 complex closed state 5
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-40489, PDB-8shn:
CCT-G beta 5 complex closed state 6
Method: EM (single particle) / Resolution: 2.8 Å

EMDB-40490, PDB-8sho:
CCT G beta 5 complex close state 11
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-40491, PDB-8shp:
CCT G beta 5 complex closed state 13
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-40492, PDB-8shq:
CCT G beta 5 complex closed state 12
Method: EM (single particle) / Resolution: 2.9 Å

EMDB-40494, PDB-8sht:
CCT G beta 5 complex closed state 14
Method: EM (single particle) / Resolution: 3.0 Å

Chemicals

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

ChemComp-MG:
Unknown entry

ChemComp-AF3:
ALUMINUM FLUORIDE

ChemComp-HOH:
WATER

Source
  • homo sapiens (human)
KeywordsCHAPERONE / CCT / Gb5 / complex / open

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