Macromolecule Content

• Total Structure Weight: 15.08 kDa 
• Atom Count: 1054 
• Modelled Residue Count: 130 
• Deposited Residue Count: 130 
• Unique protein chains: 1

1AWE

HUMAN SOS1 PLECKSTRIN HOMOLOGY (PH) DOMAIN, NMR, 20 STRUCTURES

• DOI: 10.2210/pdb1AWE/pdb

• Classification: SIGNAL TRANSDUCTION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 1997-10-01 Released: 1998-02-25 
• Deposition Author(s): Zheng, J., Cowburn, D.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 750 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Literature

The solution structure of the pleckstrin homology domain of human SOS1. A possible structural role for the sequential association of diffuse B cell lymphoma and pleckstrin homology domains.

Zheng, J., Chen, R.H., Corblan-Garcia, S., Cahill, S.M., Bar-Sagi, D., Cowburn, D.

(1997) J Biol Chem 272: 30340-30344

• PubMed: 9374522 
• DOI: 10.1074/jbc.272.48.30340
• Primary Citation of Related Structures:  
  1AWE


• PubMed Abstract: 
  

A large subset of pleckstrin homology (PH) domains are immediately to the C terminus of diffuse B cell lymphoma (Dbl) homology (DbH) domains. Dbl domains are generally considered to be GTPase-exchange factors; many are proto-oncogenes. PH domains appear to function as membrane-recruitment factors, or have specific protein-protein interactions. Since dual domain (DbH/PH) constructs are known to have significant properties in other pathways, it is possible that a defined interdomain relationship is required for DbH/PH function. We determined the solution structure of the human SOS1 PH domain for a construct partially extended into the preceding DbH domain. There are specific structural contacts between the PH and the vestigial DbH domain. This appears to involve structural elements common to this subfamily of PH domains, and to DbH domains. The human SOS1 PH domain binds to inositol 1,4,5-triphosphate with a approximately 60 mu M affinity. Using chemical shift titration, the binding site is identified to be essentially identical to that observed crystallographically for the inositol 1,4,5-triphosphate complex with the PH domain of phospholipase Cdelta. This site may serve as an interdomain regulator of DbH or other domains' functions. While the overall fold of the human SOS1 PH domain is similar to other PH domains, the size and position of the intrastrand loops and the presence of an N-terminal alpha-helix of the vestigial DbH domain suggest that the subfamily of PH domains associated with DbH domains may be a well defined structural group in which the PH domain is a membrane recruiter and modulator.

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Organizational Affiliation: 

The Rockefeller University, New York, New York 10021, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SOS1	A	130	Homo sapiens	Mutation(s): 0  Gene Names: SOS1
UniProt & NIH Common Fund Data Resources
Find proteins for Q07889 (Homo sapiens) Explore Q07889  Go to UniProtKB:  Q07889
PHAROS:  Q07889 GTEx:  ENSG00000115904

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 750 
• Conformers Submitted: 20 
• Selection Criteria: target function 
• OLDERADO: 1AWE Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-10-01 
• Released Date: 1998-02-25 
Deposition Author(s): Zheng, J., Cowburn, D.

Revision History  

• Version 1.0: 1998-02-25
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance