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A Guide to Production, Crystallization, and Structure Determination of Human IKK1/α
Published on: November 2, 2018
A Guide to Production, Crystallization, and Structure Determination of Human IKK1/α
Smarajit Polley1, De-Bin Huang2, Tapan Biswas2
1Department of Chemistry & Biochemistry, University of California, San Diego; Department of Biophysics, Bose Institute.
Insights
Activation of IKK1/α is crucial for NF-κB signaling in inflammation and cancer. Researchers successfully produced and crystallized recombinant IKK1/α, enabling structural studies for drug target development.
Area of Science:
- Molecular Biology
- Structural Biology
- Biochemistry
Background:
- Extracellular stimuli activate IKK1/α, leading to NF-κB subunit p52 generation, which regulates genes in inflammation, cell survival, and cell cycle.
- IKK1/α exists in both large ternary complexes and smaller complexes; the activation mechanism within these pools remains unclear.
- Constitutive IKK1/α activity is implicated in cancers and inflammatory diseases, highlighting its potential as a drug target.
Purpose of the Study:
- To elucidate the activation mechanism of IKK1/α.
- To facilitate the development of IKK1/α as a drug target.
- To produce recombinant IKK1/α for structural and biochemical studies.
Main Methods:
- Recombinant IKK1/α was expressed in E. coli, insect, and mammalian cells.
- Soluble IKK1/α was successfully produced in baculovirus-infected insect cells.
- Purified IKK1/α was crystallized in the presence of inhibitors for X-ray crystallography.
Main Results:
- Obtained milligram quantities of highly pure recombinant IKK1/α.
- Determined the X-ray crystal structure of IKK1/α.
- Detailed protocols for protein production, crystallization, and structure determination are provided.
Conclusions:
- The successful production and structural determination of IKK1/α provide a foundation for understanding its activation and for designing targeted therapeutics.
- Structural insights into IKK1/α may pave the way for novel anti-cancer and anti-inflammatory drugs.
- This work enables further investigation into the role of different IKK1/α complex pools in cellular signaling.
Abstract:
A class of extracellular stimuli requires activation of IKK1/α to induce generation of an NF-κB subunit, p52, through processing of its precursor p100. p52 functions as a homodimer or heterodimer with another NF-κB subunit, RelB. These dimers in turn regulate the expression of hundreds of genes involved in inflammation, cell survival, and cell cycle. IKK1/α primarily remains associated with IKK2/β and NEMO as a ternary complex. However, a small pool of it is also observed as a low molecular weight complex(es). It is unknown if the p100 processing activity is triggered by activation of IKK1/α within the larger or the smaller complex pool. Constitutive activity of IKK1/α has been detected in several cancers and inflammatory diseases. To understand the mechanism of activation of IKK1/α, and enable its use as a drug target, we expressed recombinant IKK1/α in different host systems, such as E. coli, insect, and mammalian cells. We succeeded in expressing soluble IKK1/α in baculovirus infected insect cells, obtaining mg quantities of highly pure protein, crystallizing it in the presence of inhibitors, and determining its X-ray crystal structure. Here, we describe the detailed steps to produce the recombinant protein, its crystallization, and its X-ray crystal structure determination.
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