1NF3

Structure of Cdc42 in a complex with the GTPase-binding domain of the cell polarity protein, Par6

DOI: 10.2210/pdb1NF3/pdb

Classification: SIGNALING PROTEIN
Organism(s): Homo sapiens, Mus musculus
Expression System: Escherichia coli BL21(DE3)
Mutation(s): Yes

Deposited: 2002-12-12 Released: 2003-03-04
Deposition Author(s): Garrard, S.M., Capaldo, C.T., Gao, L., Rosen, M.K., Macara, I.G., Tomchick, D.R.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.10 Å
R-Value Free: 0.273
R-Value Work: 0.219
R-Value Observed: 0.219

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

Structure of Cdc42 in a complex with the GTPase-binding domain of the cell polarity protein, Par6

Garrard, S.M., Capaldo, C.T., Gao, L., Rosen, M.K., Macara, I.G., Tomchick, D.R.

(2003) EMBO J 22: 1125-1133

PubMed: 12606577 Search on PubMedSearch on PubMed Central
DOI: 10.1093/emboj/cdg110
Primary Citation of Related Structures:
1NF3

PubMed Abstract:

Cdc42 is a small GTPase that is required for cell polarity establishment in eukaryotes as diverse as budding yeast and mammals. Par6 is also implicated in metazoan cell polarity establishment and asymmetric cell divisions. Cdc42.GTP interacts with proteins that contain a conserved sequence called a CRIB motif. Uniquely, Par6 possesses a semi-CRIB motif that is not sufficient for binding to Cdc42. An adjacent PDZ domain is also necessary and is required for biological effects of Par6. Here we report the crystal structure of a complex between Cdc42 and the Par6 GTPase-binding domain. The semi-CRIB motif forms a beta-strand that inserts between the four strands of Cdc42 and the three strands of the PDZ domain to form a continuous eight-stranded sheet. Cdc42 induces a conformational change in Par6, detectable by fluorescence resonance energy transfer spectroscopy. Nuclear magnetic resonance studies indicate that the semi-CRIB motif of Par6 is at least partially structured by the PDZ domain. The structure highlights a novel role for a PDZ domain as a structural scaffold.

Related Citations:

Assembly of epithelial tight junctions is negatively regulated by Par6
Gao, L., Joberty, G., Macara, I.G.
(2002) Curr Biol 12: 221

The cell-polarity protein Par6 links Par3 and atypical protein kinase C to Cdc42
Joberty, G., Petersen, C., Gao, L., Macara, I.G.
(2000) Nat Cell Biol 2: 531

A mammalian Par-3-Par-6 complex implicated in Cdc42/Rac1 and aPKC signalling and cell polarity
Lin, D., Edwards, A.S., Fawcett, J.P., Mbamalu, G., Scott, J.D., Pawson, T.
(2000) Nat Cell Biol 2: 540

A human homolog of the C. elegans polarity determinant Par-6 links Rac and Cdc42 to PKCzeta signaling and cell transformation
Qiu, R.G., Abo, A., Steven Martin, G.
(2000) Curr Biol 10: 697

Par-6, a gene involved in the establishment of asymmetry in early C. elegans embryos, mediates the asymmetric localization of Par-3
Watts, J.L., Etemad-Moghadam, B., Guo, S., Boyd, L., Draper, B.W., Mello, C.C., Priess, J.R., Kemphues, K.J.
(1996) Development 122: 3133

Organizational Affiliation:

Center for Cell Signaling and Department of Microbiology, University of Virginia, Charlottesville, VA 22908, USA.

Macromolecules

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
G25K GTP-binding protein, placental isoform	A, B	195	Homo sapiens	Mutation(s): 1 Gene Names: CDC42 EC: 3.6.5.2
Find proteins for P60953 (Homo sapiens) Explore P60953 Go to UniProtKB: P60953
NIH Common Fund Data Resources
PHAROS: P60953 GTEx: ENSG00000070831
Protein Feature View Expand
Reference Sequence

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
PAR-6B	C, D	128	Mus musculus	Mutation(s): 0 Gene Names: Par6b, Pard6b
Find proteins for Q9JK83 (Mus musculus) Explore Q9JK83 Go to UniProtKB: Q9JK83
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
GNP Query on GNP Download Ideal Coordinates CCD File SDF format, chain F [A] SDF format, chain H [B] MOL2 format, chain F [A] MOL2 format, chain H [B]	A, B	PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER C₁₀ H₁₇ N₆ O₁₃ P₃ UQABYHGXWYXDTK-UUOKFMHZSA-N		Ligand Interaction
MG Query on MG Download Ideal Coordinates CCD File SDF format, chain G [B] SDF format, chain E [A] MOL2 format, chain G [B] MOL2 format, chain E [A]	A, B	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Ligand Interaction