4Q21

MOLECULAR SWITCH FOR SIGNAL TRANSDUCTION: STRUCTURAL DIFFERENCES BETWEEN ACTIVE AND INACTIVE FORMS OF PROTOONCOGENIC RAS PROTEINS

PDB DOI: 10.2210/pdb4Q21/pdb

Classification: ONCOGENE PROTEIN
Organism(s): Homo sapiens
Mutation(s): No

Deposited: 1991-09-25 Released: 1992-07-15
Deposition Author(s): Kim, S.-H.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.00 Å
R-Value Work: 0.195

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history.

Literature

Molecular switch for signal transduction: structural differences between active and inactive forms of protooncogenic ras proteins.

Milburn, M.V., Tong, L., deVos, A.M., Brunger, A., Yamaizumi, Z., Nishimura, S., Kim, S.H.

(1990) Science 247: 939-945

PubMed: 2406906 Search on PubMed
DOI: 10.1126/science.2406906
Primary Citation of Related Structures:
4Q21, 6Q21

PubMed Abstract:

Ras proteins participate as a molecular switch in the early steps of the signal transduction pathway that is associated with cell growth and differentiation. When the protein is in its GTP complexed form it is active in signal transduction, whereas it is inactive in its GDP complexed form. A comparison of eight three-dimensional structures of ras proteins in four different crystal lattices, five with a nonhydrolyzable GTP analog and three with GDP, reveals that the "on" and "off" states of the switch are distinguished by conformational differences that span a length of more than 40 A, and are induced by the gamma-phosphate. The most significant differences are localized in two regions: residues 30 to 38 (the switch I region) in the second loop and residues 60 to 76 (the switch II region) consisting of the fourth loop and the short alpha-helix that follows the loop. Both regions are highly exposed and form a continuous strip on the molecular surface most likely to be the recognition sites for the effector and receptor molecule(or molecules). The conformational differences also provide a structural basis for understanding the biological and biochemical changes of the proteins due to oncogenic mutations, autophosphorylation, and GTP hydrolysis, and for understanding the interactions with other proteins.

Related Citations:

X-Ray Crystal Structures of Transforming P21 Ras Mutants Suggest a Transition-State Stabilization Mechanism for GTP Hydrolysis
Prive, G.G., Milburn, M.V., Tong, L., Devos, A.M., Yamaizumi, Z., Nishimura, S., Kim, S.-H.
(1992) Proc Natl Acad Sci U S A 89: 3649

Crystal Structure of an Active Form of Ras Protein, a Complex of a GTP Analog and the Hras P21 Catalytic Domain
Brunger, A.T., Milburn, M.V., Tong, L., Devos, A.M., Jancarik, J., Yamaizumi, Z., Nishimura, S., Ohtsuka, E., Kim, S.-H.
(1990) Proc Natl Acad Sci U S A 87: 4849

Structure of Ras Protein
Tong, L., Milburn, M.V., Devos, A.M., Kim, S.-H.
(1989) Science 245: 244

Three-Dimensional Structure of an Oncogene Protein. Catalytic Domain of Human C-H-Ras P21
Devos, A.M., Tong, L., Milburn, M.V., Matias, P.M., Jancarik, J., Noguchi, S., Nishimura, S., Miura, K., Ohtsuka, E., Kim, S.-H.
(1988) Science 239: 888

Organizational Affiliation:

Department of Chemistry, University of California, Berkeley.

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
C-H-RAS P21 PROTEIN CATALYTIC DOMAIN	A	189	Homo sapiens	Mutation(s): 0 Gene Names: HRAS, HRAS1 EC: 3.6.5.2
UniProt & NIH Common Fund Data Resources
Find proteins for P01112 (Homo sapiens) Explore P01112 Go to UniProtKB: P01112
PHAROS: P01112
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P01112
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
GDP Query on GDP Download Ideal Coordinates CCD File SDF format, chain C [auth A] MOL2 format, chain C [auth A]	C [auth A]	GUANOSINE-5'-DIPHOSPHATE C₁₀ H₁₅ N₅ O₁₁ P₂ QGWNDRXFNXRZMB-UUOKFMHZSA-N		Ligand Interaction
MG Query on MG Download Ideal Coordinates CCD File SDF format, chain B [auth A] MOL2 format, chain B [auth A]	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Ligand Interaction