Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 88.08 kDa 
• Atom Count: 6106 
• Residue Count: 782 
• Unique protein chains: 1

1BIH

CRYSTAL STRUCTURE OF THE INSECT IMMUNE PROTEIN HEMOLIN: A NEW DOMAIN ARRANGEMENT WITH IMPLICATIONS FOR HOMOPHILIC ADHESION

• DOI: 10.2210/pdb1BIH/pdb

• Classification: INSECT IMMUNITY
• Organism(s): Hyalophora cecropia
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 1998-06-17 Released: 1998-10-14 
• Deposition Author(s): Su, X.-D., Gastinel, L.N., Vaughn, D.E., Faye, I., Poon, P., Bjorkman, P.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.10 Å
• R-Value Free: 0.264 
• R-Value Work: 0.218 
• R-Value Observed: 0.218 

Literature

Crystal structure of hemolin: a horseshoe shape with implications for homophilic adhesion.

Su, X.D., Gastinel, L.N., Vaughn, D.E., Faye, I., Poon, P., Bjorkman, P.J.

(1998) Science 281: 991-995

• PubMed: 9703515 
• DOI: 10.1126/science.281.5379.991
• Primary Citation of Related Structures:  
  1BIH


• PubMed Abstract: 
  

Hemolin, an insect immunoglobulin superfamily member, is a lipopolysaccharide-binding immune protein induced during bacterial infection. The 3.1 angstrom crystal structure reveals a bound phosphate and patches of positive charge, which may represent the lipopolysaccharide binding site, and a new and unexpected arrangement of four immunoglobulin-like domains forming a horseshoe. Sequence analysis and analytical ultracentrifugation suggest that the domain arrangement is a feature of the L1 family of neural cell adhesion molecules related to hemolin. These results are relevant to interpretation of human L1 mutations in neurological diseases and suggest a domain swapping model for how L1 family proteins mediate homophilic adhesion.

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Organizational Affiliation: 

Division of Biology 156-29 and Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HEMOLIN	A, B	395	Hyalophora cecropia	Mutation(s): 0
Find proteins for P25033 (Hyalophora cecropia) Explore P25033  Go to UniProtKB:  P25033

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	A, B	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.10 Å
• R-Value Free: 0.264 
• R-Value Work: 0.218 
• R-Value Observed: 0.218 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85	α = 90
b = 90.3	β = 90
c = 143.1	γ = 90

Software Package:

Software Name	Purpose
XDS	data scaling
XDS	data reduction
MLPHARE	phasing
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-06-17 
• Released Date: 1998-10-14 
Deposition Author(s): Su, X.-D., Gastinel, L.N., Vaughn, D.E., Faye, I., Poon, P., Bjorkman, P.J.

Revision History 

• Version 1.0: 1998-10-14
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-03-07
  Changes: Advisory, Data collection