4ALO

STRUCTURE AND PROPERTIES OF H1 CRUSTACYANIN FROM LOBSTER HOMARUS AMERICANUS

• PDB DOI: https://doi.org/10.2210/pdb4ALO/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Homarus americanus
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2012-03-05 Released: 2012-08-08 
• Deposition Author(s): Ferrari, M., Folli, C., Pincolini, E., Mcclintock, T.S., Roessle, M., Berni, R., Cianci, M.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.37 Å
• R-Value Free: 0.266 
• R-Value Work: 0.222 
• R-Value Observed: 0.225 

Starting Model: experimental

Literature

Structural Characterization of Recombinant Crustacyanin Subunits from the Lobster Homarus Americanus.

Ferrari, M., Folli, C., Pincolini, E., Mcclintock, T.S., Rossle, M., Berni, R., Cianci, M.

(2012) Acta Crystallogr Sect F Struct Biol Cryst Commun 68: 846

• PubMed: 22869108 
• DOI: https://doi.org/10.1107/S1744309112026103
• Primary Citation of Related Structures:  
  4ALO


• PubMed Abstract: 
  

  Crustacean crustacyanin proteins are linked to the production and modification of carapace colour, with direct implications for fitness and survival. Here, the structural and functional properties of the two recombinant crustacyanin subunits H(1) and H(2) from the American lobster Homarus americanus are reported. The two subunits are structurally highly similar to the corresponding natural apo crustacyanin CRTC and CRTA subunits from the European lobster H. gammarus. Reconstitution studies of the recombinant crustacyanin proteins H(1) and H(2) with astaxanthin reproduced the bathochromic shift of 85-95 nm typical of the natural crustacyanin subunits from H. gammarus in complex with astaxanthin. Moreover, correlations between the presence of crustacyanin genes in crustacean species and the resulting carapace colours with the spectral properties of the subunits in complex with astaxanthin confirmed this genotype-phenotype linkage.

---

Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, University of Parma, Parco Area delle Scienze 23/A, 43124 Parma, Italy.

Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 42.53 kDa 
• Atom Count: 3,084 
• Modelled Residue Count: 362 
• Deposited Residue Count: 362 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
H1 APOCRUSTACYANIN	A, B	181	Homarus americanus	Mutation(s): 0
UniProt
Find proteins for J3QW35 (Homarus americanus) Explore J3QW35  Go to UniProtKB:  J3QW35

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MPD	C [auth A], D [auth A], H [auth A], I [auth B], J [auth B]	(4S)-2-METHYL-2,4-PENTANEDIOL C6 H14 O2 SVTBMSDMJJWYQN-YFKPBYRVSA-N
SO4	E [auth A], K [auth B], M [auth B], N [auth B], O [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
NA	F [auth A], G [auth A], L [auth B]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.37 Å
• R-Value Free: 0.266 
• R-Value Work: 0.222 
• R-Value Observed: 0.225 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 40.368	α = 90
b = 78.423	β = 90
c = 105.625	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-08-08 
Deposition Author(s): Ferrari, M., Folli, C., Pincolini, E., Mcclintock, T.S., Roessle, M., Berni, R., Cianci, M.

Revision History  

• Version 1.0: 2012-08-08
  Type: Initial release
  
• Version 1.1: 2012-08-15
  Changes: Database references
• Version 1.2: 2023-12-20
  Changes: Data collection, Database references, Derived calculations, Other, Refinement description