ISDA: 6M49

Deposition Date 2020-03-06

Release Date 2021-01-20

Last Version Date 2025-06-25

Entry Detail

PDB ID:

6M49

Keywords:

MEMBRANE PROTEIN

Title:

cryo-EM structure of Scap/Insig complex in the present of 25-hydroxyl cholesterol.

Biological Source:

Source Organism(s):

Homo sapiens (Taxon ID: 9606)

Expression System(s):

Homo sapiens

Method Details:

Experimental Method:

ELECTRON MICROSCOPY

Resolution:

3.70 Å

Aggregation State:

PARTICLE

Reconstruction Method:

SINGLE PARTICLE

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Insulin-induced gene 2 protein
Gene (Uniprot):INSIG2
Mutagens:C14S, C90S, C215S
Chain IDs:A
Chain Length:225
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:Q9Y5U4 Pfam ID:PF07281

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Sterol regulatory element-binding protein cleavage-activating protein,Sterol regulatory element-binding protein cleavage-activating protein
Gene (Uniprot):SCAP
Chain IDs:B
Chain Length:572
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:Q12770 Pfam ID:PF12349, PF24006

Ligand Molecules

HC3

Primary Citation

A structure of human Scap bound to Insig-2 suggests how their interaction is regulated by sterols.

Yan, R, Cao, P, Song, W, Qian, H, Du, X, Coates, H.W, Zhao, X, Li, Y, Gao, S, Gong, X, Liu, X, Sui, J, Lei, J, Yang, H, Brown, A.J, Zhou, Q, Yan, C, Yan, N.Show

Science 371 ? ? (2021)

PMID: 33446483 DOI: 10.1126/science.abb2224

Abstact

The sterol regulatory element-binding protein (SREBP) pathway controls cellular homeostasis of sterols. The key players in this pathway, Scap and Insig-1 and -2, are membrane-embedded sterol sensors. The 25-hydroxycholesterol (25HC)-dependent association of Scap and Insig acts as the master switch for the SREBP pathway. Here, we present cryo-electron microscopy analysis of the human Scap and Insig-2 complex in the presence of 25HC, with the transmembrane (TM) domains determined at an average resolution of 3.7 angstrom. The sterol-sensing domain in Scap and all six TMs in Insig-2 were resolved. A 25HC molecule is sandwiched between the S4 to S6 segments in Scap and TMs 3 and 4 in Insig-2 in the luminal leaflet of the membrane. Unwinding of the middle of the Scap-S4 segment is crucial for 25HC binding and Insig association.

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Primary Citation of related structures

Abstact

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