1IQ3

SOLUTION STRUCTURE OF THE EPS15 HOMOLOGY DOMAIN OF A HUMAN POB1

• PDB DOI: https://doi.org/10.2210/pdb1IQ3/pdb

• Classification: ENDOCYTOSIS/EXOCYTOSIS
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2001-06-06 Released: 2001-06-27 
• Deposition Author(s): Koshiba, S., Kigawa, T., Iwahara, J., Kikuchi, A., Yokoyama, S., RIKEN Structural Genomics/Proteomics Initiative (RSGI)

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 18 
• Selection Criteria: structures with the lowest energy 

Literature

Solution structure of the Eps15 homology domain of a human POB1 (partner of RalBP1).

Koshiba, S., Kigawa, T., Iwahara, J., Kikuchi, A., Yokoyama, S.

(1999) FEBS Lett 442: 138-142

• PubMed: 9928989 
• DOI: https://doi.org/10.1016/s0014-5793(98)01644-5
• Primary Citation of Related Structures:  
  1IQ3


• PubMed Abstract: 
  

  The solution structure of the Eps15 homology (EH) domain of a human POB1 (partner of RaIBP1) has been determined by uniform 13C/15N labeling and heteronuclear multidimensional nuclear magnetic resonance spectroscopy. The POB1 EH domain consists of two EF-hand structures, and the second one binds a calcium ion. In the calcium-bound state, the orientation of the fourth alpha-helix relative to the other helices of the POB1 EH domain is slightly different from that of calbindin, and much more different from those of calmodulin and troponin C, on the basis of their atomic coordinates.

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Organizational Affiliation: 

Cellular Signaling Laboratory, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, Japan.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 12.48 kDa 
• Atom Count: 881 
• Modelled Residue Count: 110 
• Deposited Residue Count: 110 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RALBP1-INTERACTING PROTEIN (PARTNER OF RALBP1)	A	110	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NFH8 (Homo sapiens) Explore Q8NFH8  Go to UniProtKB:  Q8NFH8
PHAROS:  Q8NFH8 GTEx:  ENSG00000169891

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 18 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-06-27 
Deposition Author(s): Koshiba, S., Kigawa, T., Iwahara, J., Kikuchi, A., Yokoyama, S., RIKEN Structural Genomics/Proteomics Initiative (RSGI)

Revision History  

• Version 1.0: 2001-06-27
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-02-23
  Changes: Data collection, Database references, Derived calculations
• Version 1.4: 2023-12-27
  Changes: Data collection