2YNO image
Entry Detail
PDB ID:
2YNO
Title:
yeast betaprime COP 1-304H6
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2012-10-17
Release Date:
2012-12-12
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.22
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:COATOMER SUBUNIT BETA'
Chain IDs:A, B
Chain Length:310
Number of Molecules:2
Biological Source:SACCHAROMYCES CEREVISIAE
Polymer Type:polypeptide(L)
Description:POLY ALA
Chain IDs:C (auth: P)
Chain Length:5
Number of Molecules:1
Biological Source:UNIDENTIFIED
Primary Citation
Molecular Basis for Recognition of Dilysine Trafficking Motifs by Copi.
Dev.Cell 23 1255 ? (2012)
PMID: 23177648 DOI: 10.1016/J.DEVCEL.2012.10.017

Abstact

COPI mediates retrograde trafficking from the Golgi to the endoplasmic reticulum (ER) and within the Golgi stack, sorting transmembrane proteins bearing C-terminal KKxx or KxKxx motifs. The structure of KxKxx motifs bound to the N-terminal WD-repeat domain of β'-COP identifies electrostatic contacts between the motif and complementary patches at the center of the β'-COP propeller. An absolute requirement of a two-residue spacing between the terminal carboxylate group and first lysine residue results from interactions of carbonyl groups in the motif backbone with basic side chains of β'-COP. Similar interactions are proposed to mediate binding of KKxx motifs by the homologous α-COP domain. Mutation of key interacting residues in either domain or in their cognate motifs abolishes in vitro binding and results in mistrafficking of dilysine-containing cargo in yeast without compromising cell viability. Flexibility between β'-COP WD-repeat domains and the location of cargo binding have implications for COPI coat assembly.

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Primary Citation of related structures