Crystal structures of green fluorescent protein with the unnatural amino acid 4-nitro-L -phenylalanine
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- OTHER
- OSTI ID:
- 1483086
- Journal Information:
- Acta Crystallographica. Section F, Structural Biology Communications, Vol. 74, Issue 10; ISSN 2053-230X
- Publisher:
- International Union of Crystallography
- Country of Publication:
- United States
- Language:
- ENGLISH
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