3S64

Saposin-like protein Ac-SLP-1

• PDB DOI: https://doi.org/10.2210/pdb3S64/pdb

• Classification: LIPID BINDING PROTEIN
• Organism(s): Ancylostoma caninum
• Expression System: Komagataella pastoris
• Mutation(s): No 


• Deposited: 2011-05-25 Released: 2012-01-18 
• Deposition Author(s): Willis, C., Wang, C.K., Osman, A., Simon, A., Mulvenna, J., Pickering, D., Riboldi-Tunicliffe, A., Jones, M.K., Loukas, A., Hofmann, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.252 
• R-Value Work: 0.225 
• R-Value Observed: 0.226 

Literature

Insights into the membrane interactions of the saposin-like proteins Na-SLP-1 and Ac-SLP-1 from human and dog hookworm.

Willis, C., Wang, C.K., Osman, A., Simon, A., Pickering, D., Mulvenna, J., Riboldi-Tunicliffe, A., Jones, M.K., Loukas, A., Hofmann, A.

(2011) PLoS One 6: e25369-e25369

• PubMed: 21991310 
• DOI: https://doi.org/10.1371/journal.pone.0025369
• Primary Citation of Related Structures:  
  3S63, 3S64


• PubMed Abstract: 
  

  Saposin-like proteins (SAPLIPs) from soil-transmitted helminths play pivotal roles in host-pathogen interactions and have a high potential as targets for vaccination against parasitic diseases. We have identified two non-orthologous SAPLIPs from human and dog hookworm, Na-SLP-1 and Ac-SLP-1, and solved their three-dimensional crystal structures. Both proteins share the property of membrane binding as monitored by liposome co-pelleting assays and monolayer adsorption. Neither SAPLIP displayed any significant haemolytic or bactericidal activity. Based on the structural information, as well as the results from monolayer adsorption, we propose models of membrane interactions for both SAPLIPs. Initial membrane contact of the monomeric Na-SLP-1 is most likely by electrostatic interactions between the membrane surface and a prominent basic surface patch. In case of the dimeric Ac-SLP-1, membrane interactions are most likely initiated by a unique tryptophan residue that has previously been implicated in membrane interactions in other SAPLIPs.

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Organizational Affiliation: 

Parasite Cell Biology, Queensland Institute of Medical Research, Herston, Queensland, Australia.

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: 9.97 kDa 
• Atom Count: 666 
• Modelled Residue Count: 81 
• Deposited Residue Count: 87 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Saposin-like protein 1	A	87	Ancylostoma caninum	Mutation(s): 0  Gene Names: SLP1
UniProt
Find proteins for Q0MRQ4 (Ancylostoma caninum) Explore Q0MRQ4  Go to UniProtKB:  Q0MRQ4

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EPE	C [auth A]	4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID C8 H18 N2 O4 S JKMHFZQWWAIEOD-UHFFFAOYSA-N
CIT	B [auth A]	CITRIC ACID C6 H8 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.252 
• R-Value Work: 0.225 
• R-Value Observed: 0.226 
• Space Group: P 6₂ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 72.053	α = 90
b = 72.053	β = 90
c = 90.888	γ = 120

Software Package:

Software Name	Purpose
ADSC	data collection
SHARP	phasing
PHENIX	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-01-18 
Deposition Author(s): Willis, C., Wang, C.K., Osman, A., Simon, A., Mulvenna, J., Pickering, D., Riboldi-Tunicliffe, A., Jones, M.K., Loukas, A., Hofmann, A.

Revision History  

• Version 1.0: 2012-01-18
  Type: Initial release