Biological Assembly 1  

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

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

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

Macromolecule Content

• Total Structure Weight: 18.91 kDa 
• Atom Count: 1296 
• Modelled Residue Count: 177 
• Deposited Residue Count: 177 
• Unique protein chains: 1

5MS9

Solution structure of Human Fibrillin-1 EGF2-EGF3-Hybrid1-cbEGF1 four domain fragment

• PDB DOI: 10.2210/pdb5MS9/pdb
• BMRB: 19078

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2017-01-01 Released: 2017-08-09 
• Deposition Author(s): Robertson, I.B., Redfield, C., Handford, P.A.
• Funding Organization(s): Medical Research Council (United Kingdom)

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

The N-Terminal Region of Fibrillin-1 Mediates a Bipartite Interaction with LTBP1.

Robertson, I.B., Dias, H.F., Osuch, I.H., Lowe, E.D., Jensen, S.A., Redfield, C., Handford, P.A.

(2017) Structure 25: 1208-1221.e5

• PubMed: 28669633 
• DOI: 10.1016/j.str.2017.06.003
• Primary Citation of Related Structures:  
  5MS9


• PubMed Abstract: 
  

Fibrillin-1 (FBN1) mutations associated with Marfan syndrome lead to an increase in transforming growth factor β (TGF-β) activation in connective tissues resulting in pathogenic changes including aortic dilatation and dissection. Since FBN1 binds latent TGF-β binding proteins (LTBPs), the major reservoir of TGF-β in the extracellular matrix (ECM), we investigated the structural basis for the FBN1/LTBP1 interaction. We present the structure of a four-domain FBN1 fragment, EGF2-EGF3-Hyb1-cbEGF1 (FBN1 ^E2cbEGF1 ), which reveals a near-linear domain organization. Binding studies demonstrate a bipartite interaction between a C-terminal LTBP1 fragment and FBN1 ^E2cbEGF1 , which lies adjacent to the latency-associated propeptide (LAP)/TGF-β binding site of LTBP1. Modeling of the binding interface suggests that, rather than interacting along the longitudinal axis, LTBP1 anchors itself to FBN1 using two independent epitopes. As part of this mechanism, a flexible pivot adjacent to the FBN1/LTBP1 binding site allows LTBP1 to make contacts with different ECM networks while presumably facilitating a force-induced/traction-based TGF-β activation mechanism.

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Related Citations: 

• 1H, 13C and 15N resonance assignments for the fibrillin-1 EGF2-EGF3-hybrid1-cbEGF1 four-domain fragment.
  Robertson, I.B., Osuch, I., Yadin, D.A., Handford, P.A., Jensen, S.A., Redfield, C.
  (2014) Biomol NMR Assign 8: 189

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Organizational Affiliation: 

Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Fibrillin-1	A	177	Homo sapiens	Mutation(s): 0  Gene Names: FBN1, FBN
UniProt & NIH Common Fund Data Resources
Find proteins for P35555 (Homo sapiens) Explore P35555  Go to UniProtKB:  P35555
PHAROS:  P35555 GTEx:  ENSG00000166147

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 5MS9 Olderado

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-01-01 
• Released Date: 2017-08-09 
Deposition Author(s): Robertson, I.B., Redfield, C., Handford, P.A.

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Funding Organization	Location	Grant Number
Medical Research Council (United Kingdom)	United Kingdom	MR/M009831/1

Revision History  

• Version 1.0: 2017-08-09
  Type: Initial release
  
• Version 1.1: 2019-05-08
  Changes: Data collection