3BKR

Crystal Structure of Sterol Carrier Protein-2 like-3 (SCP2-L3) from Aedes Aegypti


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 

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Literature

Characterization of the yellow fever mosquito sterol carrier protein-2 like 3 gene and ligand-bound protein structure.

Dyer, D.H.Vyazunova, I.Lorch, J.M.Forest, K.T.Lan, Q.

(2009) Mol Cell Biochem 326: 67-77

  • DOI: 10.1007/s11010-008-0007-z
  • Primary Citation of Related Structures:  
    3BKR, 3BKS

  • PubMed Abstract: 
  • The sterol carrier protein-2 like 3 gene (AeSCP-2L3), a new member of the SCP-2 protein family, is identified from the yellow fever mosquito, Aedes aegypti. The predicted molecular weight of AeSCP-2L3 is 13.4 kDa with a calculated pI of 4.98. AeSCP-2L3 transcription occurs in the larval feeding stages and the mRNA levels decrease in pupae and adults ...

    The sterol carrier protein-2 like 3 gene (AeSCP-2L3), a new member of the SCP-2 protein family, is identified from the yellow fever mosquito, Aedes aegypti. The predicted molecular weight of AeSCP-2L3 is 13.4 kDa with a calculated pI of 4.98. AeSCP-2L3 transcription occurs in the larval feeding stages and the mRNA levels decrease in pupae and adults. The highest levels of AeSCP-2L3 gene expression are found in the body wall, and possibly originated in the fat body. This is the first report of a mosquito SCP-2-like protein with prominent expression in tissue other than the midgut. The X-ray protein crystal structure of AeSCP-2L3 reveals a bound C16 fatty acid whose acyl tail penetrates deeply into a hydrophobic cavity. Interestingly, the ligand-binding cavity is slightly larger than previously described for AeSCP-2 (Dyer et al. J Biol Chem 278:39085-39091, 2003) and AeSCP-2L2 (Dyer et al. J Lipid Res M700460-JLR200, 2007). There are also an additional 10 amino acids in SCP-2L3 that are not present in other characterized mosquito SCP-2s forming an extended loop between beta 3 and beta 4. Otherwise, the protein backbone is exceedingly similar to other SCP-2 and SCP-2-like proteins. In contrast to this observed high structural homology of members in the mosquito SCP2 family, the amino acid sequence identity between the members is less than 30%. The results from structural analysis imply that there have been evolutionary constraints that favor the SCP-2 C(alpha) backbone fold while the specificity of ligand binding can be altered.


    Organizational Affiliation

    Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Sterol Carrier Protein-2 like-3A126Aedes aegyptiMutation(s): 0 
Gene Names: AaeL_AAEL012704AAEL012704
UniProt
Find proteins for Q16LC3 (Aedes aegypti)
Explore Q16LC3 
Go to UniProtKB:  Q16LC3
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLM (Subject of Investigation/LOI)
Query on PLM

Download Ideal Coordinates CCD File 
B [auth A]PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63α = 90
b = 63β = 90
c = 67.8γ = 120
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
DENZOdata reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-12-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance