4NX6

single room temperature model of DHFR

DOI: 10.2210/pdb4NX6/pdb

Classification: OXIDOREDUCTASE
Organism(s): Escherichia coli K-12
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2013-12-08 Released: 2014-01-15
Deposition Author(s): Fenwick, R.B., van den Bedem, H., Fraser, J.S., Wright, P.E.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.35 Å
R-Value Free: 0.190
R-Value Work: 0.144
R-Value Observed: 0.147

wwPDB Validation3D Report Full Report

This is version 1.1 of the entry. See complete history.

Re-refinement Note

This entry reflects an alternative modeling of the original data in:4kjk

Literature

Integrated description of protein dynamics from room-temperature X-ray crystallography and NMR.

Fenwick, R.B., van den Bedem, H., Fraser, J.S., Wright, P.E.

(2014) Proc Natl Acad Sci U S A 111: E445-E454

PubMed: 24474795 Search on PubMedSearch on PubMed Central
DOI: 10.1073/pnas.1323440111
Structures With Same Primary Citation

PubMed Abstract:

Detailed descriptions of atomic coordinates and motions are required for an understanding of protein dynamics and their relation to molecular recognition, catalytic function, and allostery. Historically, NMR relaxation measurements have played a dominant role in the determination of the amplitudes and timescales (picosecond-nanosecond) of bond vector fluctuations, whereas high-resolution X-ray diffraction experiments can reveal the presence of and provide atomic coordinates for multiple, weakly populated substates in the protein conformational ensemble. Here we report a hybrid NMR and X-ray crystallography analysis that provides a more complete dynamic picture and a more quantitative description of the timescale and amplitude of fluctuations in atomic coordinates than is obtainable from the individual methods alone. Order parameters (S(2)) were calculated from single-conformer and multiconformer models fitted to room temperature and cryogenic X-ray diffraction data for dihydrofolate reductase. Backbone and side-chain order parameters derived from NMR relaxation experiments are in excellent agreement with those calculated from the room-temperature single-conformer and multiconformer models, showing that the picosecond timescale motions observed in solution occur also in the crystalline state. These motions are quenched in the crystal at cryogenic temperatures. The combination of NMR and X-ray crystallography in iterative refinement promises to provide an atomic resolution description of the alternate conformational substates that are sampled through picosecond to nanosecond timescale fluctuations of the protein structure. The method also provides insights into the structural heterogeneity of nonmethyl side chains, aromatic residues, and ligands, which are less commonly analyzed by NMR relaxation measurements.

Organizational Affiliation:

Department of Integrative Structural and Computational Biology and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037.

Macromolecules

Find similar proteins by: Sequence | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Dihydrofolate reductase	A	159	Escherichia coli K-12	Mutation(s): 0 Gene Names: folA, tmrA, b0048, JW0047 EC: 1.5.1.3
Find proteins for P0ABQ4 (Escherichia coli (strain K12)) Go to UniProtKB: P0ABQ4
Protein Feature View
Reference Sequence

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
NAP Query on NAP Download CCD File	A	NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE C₂₁ H₂₈ N₇ O₁₇ P₃ XJLXINKUBYWONI-NNYOXOHSSA-N		Ligand Interaction
FOL Query on FOL Download CCD File	A	FOLIC ACID C₁₉ H₁₉ N₇ O₆ OVBPIULPVIDEAO-LBPRGKRZSA-N		Ligand Interaction
BME Query on BME Download CCD File	A	BETA-MERCAPTOETHANOL C₂ H₆ O S DGVVWUTYPXICAM-UHFFFAOYSA-N		Ligand Interaction
MN Query on MN Download CCD File	A	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N		Ligand Interaction