6BN1 | pdb_00006bn1

Salvador Hippo SARAH domain complex

• PDB DOI: https://doi.org/10.2210/pdb6BN1/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Drosophila melanogaster
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2017-11-15 Released: 2018-03-14 
• Deposition Author(s): Cairns, L., Kavran, J.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 
  0.246 (Depositor), 0.251 (DCC) 
• R-Value Work: 
  0.202 (Depositor), 0.207 (DCC) 
• R-Value Observed: 
  0.204 (Depositor) 

Literature

Salvador has an extended SARAH domain that mediates binding to Hippo kinase.

Cairns, L., Tran, T., Fowl, B.H., Patterson, A., Kim, Y.J., Bothner, B., Kavran, J.M.

(2018) J Biological Chem 293: 5532-5543

• PubMed: 29519817 
• DOI: https://doi.org/10.1074/jbc.RA117.000923
• Primary Citation Related Structures: 
  6BN1


• PubMed Abstract: 
  

  The Hippo pathway controls cell proliferation and differentiation through the precisely tuned activity of a core kinase cassette. The activity of Hippo kinase is modulated by interactions between its C-terminal coiled-coil, termed the SARAH domain, and the SARAH domains of either dRassF or Salvador. Here, we wanted to understand the molecular basis of SARAH domain-mediated interactions and their influence on Hippo kinase activity. We focused on Salvador, a positive effector of Hippo activity and the least well-characterized SARAH domain-containing protein. We determined the crystal structure of a complex between Salvador and Hippo SARAH domains from Drosophila This structure provided insight into the organization of the Salvador SARAH domain including a folded N-terminal extension that expands the binding interface with Hippo SARAH domain. We also found that this extension improves the solubility of the Salvador SARAH domain, enhances binding to Hippo, and is unique to Salvador. We therefore suggest expanding the definition of the Salvador SARAH domain to include this extended region. The heterodimeric assembly observed in the crystal was confirmed by cross-linked MS and provided a structural basis for the mutually exclusive interactions of Hippo with either dRassF or Salvador. Of note, Salvador influenced the kinase activity of Mst2, the mammalian Hippo homolog. In co-transfected HEK293T cells, human Salvador increased the levels of Mst2 autophosphorylation and Mst2-mediated phosphorylation of select substrates, whereas Salvador SARAH domain inhibited Mst2 autophosphorylation in vitro These results suggest Salvador enhances the effects of Hippo kinase activity at multiple points in the Hippo pathway.

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Organizational Affiliation: 
• From the Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland 20215.
the Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, and.
From the Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland 20215, [e-mail].
the Departments of Biophysics and Biophysical Chemistry, School of Medicine, and.
Oncology, School of Medicine, Johns Hopkins University, Baltimore, Maryland 20215.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 2 generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 15.8 kDa 
• Atom Count: 1,114 
• Modeled Residue Count: 124 
• Deposited Residue Count: 127 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein kinase hippo	A	57	Drosophila melanogaster	Mutation(s): 0  Gene Names: hpo, CG11228 EC: 2.7.11.1
UniProt
Find proteins for Q8T0S6 (Drosophila melanogaster) Explore Q8T0S6  Go to UniProtKB:  Q8T0S6

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Scaffold protein salvador	B	70	Drosophila melanogaster	Mutation(s): 0  Gene Names: sav, SHRP, CG33193
UniProt
Find proteins for Q9VCR6 (Drosophila melanogaster) Explore Q9VCR6  Go to UniProtKB:  Q9VCR6

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MPD	C [auth A], D [auth A], E [auth A], G [auth B]	(4S)-2-METHYL-2,4-PENTANEDIOL C6 H14 O2 SVTBMSDMJJWYQN-YFKPBYRVSA-N
NI	F [auth B]	NICKEL (II) ION Ni VEQPNABPJHWNSG-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free:  0.246 (Depositor), 0.251 (DCC) 
• R-Value Work:  0.202 (Depositor), 0.207 (DCC) 
• R-Value Observed: 0.204 (Depositor) 

Space Group: P 4₃ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.934	α = 90
b = 49.934	β = 90
c = 186.169	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2018-03-14 
Deposition Author(s): Cairns, L., Kavran, J.M.

Revision History  

• Version 1.0: 2018-03-14
  Type: Initial release
  
• Version 1.1: 2018-03-21
  Changes: Database references
• Version 1.2: 2018-04-25
  Changes: Data collection, Database references
• Version 1.3: 2024-10-09
  Changes: Data collection, Database references, Derived calculations, Structure summary