Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 16.92 kDa 
• Atom Count: 1382 
• Modelled Residue Count: 143 
• Deposited Residue Count: 143 
• Unique protein chains: 1

4A6Q

Crystal structure of mouse SAP18 residues 6-143

• PDB DOI: 10.2210/pdb4A6Q/pdb

• Classification: TRANSCRIPTION
• Organism(s): Mus musculus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-11-08 Released: 2012-03-07 
• Deposition Author(s): Murachelli, A.G., Ebert, J., Basquin, C., Le Hir, H., Conti, E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.211 
• R-Value Work: 0.186 
• R-Value Observed: 0.187 

Literature

The Structure of the Asap Core Complex Reveals the Existence of a Pinin-Containing Psap Complex

Murachelli, A.G., Ebert, J., Basquin, C., Le Hir, H., Conti, E.

(2012) Nat Struct Mol Biol 19: 378

• PubMed: 22388736 
• DOI: 10.1038/nsmb.2242
• Primary Citation of Related Structures:  
  4A6Q, 4A8X, 4A90


• PubMed Abstract: 
  

The ASAP complex interacts with the exon-junction complex (EJC), a messenger ribonucleoprotein complex involved in post-transcriptional regulation. The three ASAP subunits (Acinus, RNPS1 and SAP18) have been individually implicated in transcriptional regulation, pre-mRNA splicing and mRNA quality control. To shed light on the basis for and consequences of ASAP's interaction with the EJC, we have determined the 1.9-Å resolution structure of a eukaryotic ASAP core complex. The RNA-recognition motif of RNPS1 binds to a conserved motif of Acinus with a recognition mode similar to that observed in splicing U2AF proteins. The Acinus-RNPS1 platform recruits the ubiquitin-like domain of SAP18, forming a ternary complex that has both RNA- and protein-binding properties. Unexpectedly, our structural analysis identified an Acinus-like motif in Pinin, another EJC-associated splicing factor. We show that Pinin physically interacts with RNPS1 and SAP18, forming an alternative ternary complex, PSAP.

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Organizational Affiliation: 

Max Planck Institute of Biochemistry, Department of Structural Cell Biology, Martinsried, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HISTONE DEACETYLASE COMPLEX SUBUNIT SAP18	A	143	Mus musculus	Mutation(s): 0  Gene Names: Sap18
UniProt & NIH Common Fund Data Resources
Find proteins for O55128 (Mus musculus) Explore O55128  Go to UniProtKB:  O55128
IMPC:  MGI:1277978

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MPD	C [auth A]	(4S)-2-METHYL-2,4-PENTANEDIOL C6 H14 O2 SVTBMSDMJJWYQN-YFKPBYRVSA-N
IPA	B [auth A]	ISOPROPYL ALCOHOL C3 H8 O KFZMGEQAYNKOFK-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.211 
• R-Value Work: 0.186 
• R-Value Observed: 0.187 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 50.368	α = 90
b = 73.631	β = 90
c = 86.704	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
SCALA	data scaling
SHELX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-11-08 
• Released Date: 2012-03-07 
Deposition Author(s): Murachelli, A.G., Ebert, J., Basquin, C., Le Hir, H., Conti, E.

Revision History  

• Version 1.0: 2012-03-07
  Type: Initial release
  
• Version 1.1: 2012-04-18
  Changes: Other
• Version 1.2: 2015-03-18
  Changes: Data collection, Other, Source and taxonomy