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Updated: Jul 18, 2026
Production, Crystallization, and Structure Determination of the IKK-binding Domain of NEMO
Published on: December 28, 2019
Purification, crystallization and preliminary crystallographic characterization of the caspase-recruitment domain of
Thiagarajan Srimathi1, Sheila L Robbins, Rachel L Dubas
1Basic Science, Fox Chase Cancer Center, Philadelphia, PA 19111, USA.
Insights
The caspase-recruitment domain (CARD) from Nod1, crucial for apoptosis and inflammation, was successfully overexpressed and purified. Structural analysis via X-ray diffraction revealed its crystal structure, providing insights into its function.
Area of Science:
- Structural biology
- Molecular biology
- Immunology
Background:
- The caspase-recruitment domain (CARD) is a key protein-protein interaction domain involved in apoptosis and inflammation.
- Nod1 is a cytosolic pathogen receptor that utilizes a CARD domain.
Purpose of the Study:
- To overexpress, purify, and crystallize the CARD of the cytosolic pathogen receptor Nod1.
- To determine the crystal structure of the Nod1 CARD domain.
Main Methods:
- Overexpression of Nod1 CARD in Escherichia coli.
- Purification using affinity chromatography and gel filtration.
- Crystallization via microseeding and X-ray diffraction data collection to 1.9 Å resolution.
Main Results:
- Purified Nod1 CARD was successfully crystallized.
- X-ray diffraction data yielded a resolution of 1.9 Å.
- Crystals belong to space group P3(1) or P3(2) with specific unit-cell parameters.
- Preliminary analysis indicated a dimeric CARD molecule in the asymmetric unit.
Conclusions:
- The study provides the first structural insights into the Nod1 CARD domain.
- Understanding the Nod1 CARD structure can elucidate its role in innate immunity and inflammation.
- This structural information may aid in the development of therapeutics targeting Nod1-mediated pathways.
Abstract:
The caspase-recruitment domain (CARD) is known to play an important role in apoptosis and inflammation as an essential protein-protein interaction domain. The CARD of the cytosolic pathogen receptor Nod1 was overexpressed in Escherichia coli and purified by affinity chromatography and gel filtration. The purified CARD was crystallized at 277 K using the microseeding method. X-ray diffraction data were collected to 1.9 A resolution. The crystals belong to space group P3(1) or P3(2), with unit-cell parameters a = b = 79.1, c = 80.9 A. Preliminary analysis indicates that there is one dimeric CARD molecule in the asymmetric unit.
