2HA1

Complex of the first and second type III domains of human Fibronectin in solution

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	IPAP-HSQC	1.0mM 1F3-2F3 U-15N, 150mM NaCl, 20mM NaPi pH 7.0, 95% H2O, 5% D2O	95% H2O/5% D2O	150mM NaCl, 20mM Na2HPO3	7.0	ambient	303
2	IPAP-HSQC	0.6mM 1F3-2F3 U-15N, 150mM NaCl, 20mM NaPi pH 7.0, 4% Radially compressed polyacrylamide gel, 95% H2O, 5% D2O	95% H2O/5% D2O	150mM NaCl, 20mM Na2HPO3	7.0	ambient	303
3	Backbone chemical shift assignments	0.6mM 1F3-2F3 U-15N, 150mM NaCl, 20mM NaPi pH 7.0, 4% Radially compressed polyacrylamide gel, 95% H2O, 5% D2O	95% H2O/5% D2O	150mM NaCl, 20mM Na2HPO3	7.0	ambient	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Home-built	Home build	750

NMR Refinement
Method	Details	Software
Rigid body docking with torsional flexibility at the interfacial amino acid sidechains	The structure was calculated by rigid body docking using ambiguous interdomain NOE-like restraints derived from chemical shift mapping of the interface and residual dipolar couplings of the complex. 7 residues from each domain were used for the ambiguous NOEs as well as 72 RDCs total. The refinement protocol was similar to that of Clore & Schwieters, JACS 125, 2902	Omega

NMR Ensemble Information
Conformer Selection Criteria	Structures forming a single cluster after imposing a 50% lowest energy cutoff
Conformers Calculated Total Number	100
Conformers Submitted Total Number	39
Representative Model	1 (closest to the average)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	Omega	Beta 6.0.3b2	GE/Bruker
2	processing	NMRPipe	2.3 Rev2005.319.11.22	Frank Delaglio, NIH/NIDDK,LCP
3	data analysis	PIPP	4.3.7	Dan Garrett, NIH/NIDDK/LCP
4	structure solution	XPLOR-NIH	2.12	Schwieters, Kuszewski, Tjandra, Clore NIH/NIDDK/LCP
5	refinement	XPLOR-NIH	2.12	Schwieters, Kuszewski, Tjandra, Clore NIH/NIDDK/LCP

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.