Colicin E3 Immunity
Colicin E3 Immunity - Related Videos
06:06
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Cited by 8 •
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The present study provides detailed in vitro ubiquitylation assay protocols for the analysis of E3 ubiquitin ligase catalytic activity. Recombinant proteins were expressed using prokaryotic systems such as Escherichia coli culture.
01:38
What is the Immune System?
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2019
Overview The immune system comprises diverse biological structures and processes that protect the body from disease. These processes can be classified into innate and adaptive immunity. To work effectively, the immune system needs to detect pathogens by distinguishing the body’s own structures from foreign elements. If this determination fails, autoimmune diseases occur in which the immune system reacts against the body’s own tissue. The Innate Immune System Acts Fast and Non-specifically
10:27
Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta
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Cited by 5 •
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The goal of this manuscript is to present an outline for the comprehensive biochemical and functional studies of the RING-type E3 ubiquitin ligases. This multistep pipeline, with detailed protocols, validates an enzymatic activity of the tested protein and demonstrates how to link the activity to function.
05:07
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We have established a technique for the isolation, phenotypic characterization and functional analysis of immune cells from murine gingiva.
01:36
Humoral Immune Responses
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2019
Overview The humoral immune response, also known as the antibody-mediated immune response, targets pathogens circulating in “humors,” or extracellular fluids, such as blood and lymph. Antibodies target invading pathogens for destruction via multiple defense mechanisms, including neutralization, opsonization, and activation of the complement system. Patients that are impaired in the production of antibodies suffer from severe and frequent infections by common pathogens and unusual pathogens. B...
FAQs
Im3 binding suppresses the functional exposure of colicin E3’s catalytic RNase domain. This tight protein-protein association acts as a molecular inhibitor rather than altering the ribosomal RNA target itself. For chemistry research, the pair provides a defined system for examining how selective binding can control the activity of an RNA-cleaving enzyme.
Electrostatic interactions help explain how Im3 recognizes and associates with colicin E3 at the molecular level. Their importance lies in connecting charge-dependent protein recognition with catalytic inhibition: the immunity protein must bind strongly enough to shield the RNase domain. This makes the toxin-immunity pair useful for studying how molecular forces regulate protein function.
Immunity prevents the toxin’s catalytic RNase activity from acting freely on its specific 16S ribosomal RNA site. The protected state therefore preserves the separation between enzyme and substrate, while loss of protection allows RNA cleavage and disruption of translation. This relationship links molecular recognition to a measurable consequence in ribosome-dependent protein synthesis.
The system combines a defined protein-protein interaction with a clearly identified RNA substrate and catalytic outcome. Im3 demonstrates how binding to one protein can shield an active RNase domain, while colicin E3 provides the functional readout through site-specific 16S ribosomal RNA cleavage. Together, these features support mechanistic studies of recognition and inhibition.
Researchers can examine the colicin E3-Im3 association as a focused model of selective molecular recognition. The interaction can be interpreted through its binding strength, electrostatic character, and effect on catalytic-domain accessibility, using the resulting inhibition as a functional consequence. This approach connects structural interaction principles with enzyme control in a chemically defined system.
The structure and mechanism of the pair inform research on bacterial competition, engineered antimicrobial systems, and molecules designed to control RNA-targeting enzymes. Its value extends beyond the individual toxin because the system shows how a binding partner can regulate a catalytic protein. These insights can guide chemical thinking about selective inhibition and activity control.