6DQ1 image
Deposition Date 2018-06-10
Release Date 2018-10-17
Last Version Date 2023-11-15
Entry Detail
PDB ID:
6DQ1
Title:
sfGFP N149 mutated to 4-nitro-L-phenylalanine
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.19
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 41 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:sfGFP
Mutations:N149 mutated to 4-nitro-L-phenylalanine
Chain IDs:A
Chain Length:239
Number of Molecules:1
Biological Source:Aequorea victoria
Ligand Molecules
Primary Citation
Crystal structures of green fluorescent protein with the unnatural amino acid 4-nitro-L-phenylalanine.
Acta Crystallogr F Struct Biol Commun 74 650 655 (2018)
PMID: 30279317 DOI: 10.1107/S2053230X1801169X

Abstact

The X-ray crystal structures of two superfolder green fluorescent protein (sfGFP) constructs containing a genetically incorporated spectroscopic reporter unnatural amino acid, 4-nitro-L-phenylalanine (pNO2F), at two unique sites in the protein have been determined. Amber codon-suppression methodology was used to site-specifically incorporate pNO2F at a solvent-accessible (Asp133) and a partially buried (Asn149) site in sfGFP. The Asp133pNO2F sfGFP construct crystallized with two molecules per asymmetric unit in space group P3221 and the crystal structure was refined to 2.05 Å resolution. Crystals of Asn149pNO2F sfGFP contained one molecule of sfGFP per asymmetric unit in space group P4122 and the structure was refined to 1.60 Å resolution. The alignment of Asp133pNO2F or Asn149pNO2F sfGFP with wild-type sfGFP resulted in small root-mean-square deviations, illustrating that these residues do not significantly alter the protein structure and supporting the use of pNO2F as an effective spectroscopic reporter of local protein structure and dynamics.

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Primary Citation of related structures