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Structure of cyclized green fluorescent protein
Andreas Hofmann1, Hideo Iwai, Sonja Hess
1Macromolecular Crystallography Laboratory, NCI at Frederick, Frederick, MD 21702, USA. hofmanna@ncifcrf.gov
Acta Crystallographica. Section D, Biological Crystallography
|August 29, 2002
Summary
Researchers determined the crystal structure of cyclic green fluorescent protein (cGFP), revealing a flexible linker region and a unique dimer interface. This flexibility and diverse interface highlight green fluorescent protein
Area of Science:
- Structural Biology
- Biochemistry
- Protein Engineering
Background:
- Cyclic green fluorescent protein (cGFP) is engineered using split intein technology.
- Understanding the structural basis of cGFP's properties is crucial for its applications.
Purpose of the Study:
- To determine the three-dimensional crystal structure of cGFP.
- To investigate the structural characteristics of the linker peptide and dimer interface in cGFP.
Main Methods:
- Protein crystallization of engineered cGFP.
- Molecular replacement for structure solution.
- Mass spectroscopy for confirmation of linker integrity.
Main Results:
- The crystal structure of cGFP was solved, revealing a highly disordered and flexible linker peptide region.
- The core protein structure is consistent with known green fluorescent protein (GFP) conformations.
- An antiparallel cGFP dimer was observed with a unique dimer interface distinct from other GFP structures.
- Mass spectroscopy confirmed the integrity of the linker peptide in dissolved crystals.
Conclusions:
- The linker peptide in cGFP is highly flexible and disordered in the crystal structure.
- The observed dimer interface suggests versatility in protein-protein interactions mediated by the GFP surface.
- The structural findings provide insights into the engineering and potential applications of cGFP.