Cap Binding Complex
Cap Binding Complex - Related Videos
10:40
Analysis of Cap-binding Proteins in Human Cells Exposed to Physiological Oxygen Conditions
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Cited by 3 •
2016
Here, we present human cell culture protocols to analyze translation initiation factors that bind the 5' cap of mRNA during physiological oxygen conditions. This method utilizes an Agarose-linked m7GTP cap analog and is suitable to investigate cap-binding factors and their interacting partners.
11:07
Biochemical Reconstitution of Steroid Receptor•Hsp90 Protein Complexes and Reactivation of Ligand Binding
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Cited by 1 •
2011
An in vitro method for preparing functional glucocorticoid receptor (GR)•hsp90 protein complexes from purified proteins and cellular lysates is described. The method utilizes immunoadsorption of recombinant GR followed by salt-stripping and protein complex reconstitution. The importance of cofactors and buffer conditions are discussed, as are potential method applications.
12:27
Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery
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Cited by 2 •
2016
Self-assembled polyelectrolyte complexes (PEC) fabricated from heparin and protamine were deposited on alginate beads to entrap and regulate the release of osteogenic growth factors. This delivery strategy enables a 20-fold reduction of BMP-2 dose in spinal fusion applications. This article illustrates the benefits and fabrication of PECs.
07:41
Sequential Salt Extractions for the Analysis of Bulk Chromatin Binding Properties of Chromatin Modifying Complexes
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Cited by 20 •
2017
Sequential salt extraction of chromatin bound proteins is a useful tool for determining the binding properties of large protein complexes. This method can be employed to evaluate the role of individual subunits or domains in the overall affinity of a protein complex to bulk chromatin.
02:18
The Equilibrium Binding Constant and Binding Strength
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2020
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium: where P and L are the unbound protein and ligand, respectively, and PL is the protein-ligand complex. As the amount of bound ligand is also related to the rate of ligand binding, experiments can also determine Kb by examining the rates of protein-ligand association (kon) and dissociation (koff) using the following ratio: Thus,...
FAQs
Recognition starts as the 5′ cap emerges from a newly produced RNA polymerase II transcript. In mammals, the CBP20 and CBP80 subunits associate with this structure at an early nuclear stage. Because binding occurs before the transcript completes maturation, the complex can help connect cap recognition with subsequent RNA processing and quality-control pathways.
Early recruitment places the complex at the transcript while nuclear processing is still underway. From this position, CBC-associated interactions can support pre-mRNA splicing, 3′-end processing, and movement toward nuclear export. The timing therefore links events that might otherwise appear separate, allowing cap recognition to influence how a transcript becomes export-competent.
CBP20 and CBP80 provide the mammalian subunit pair that recognizes the cap structure and associates with the emerging transcript. Their presence creates a molecular platform for factors involved in nuclear RNA maturation and export. After the RNA reaches the cytoplasm, CBC-associated pathways can also affect translation and nonsense-mediated mRNA decay.
Its nuclear role centers on coordinating transcript maturation and export, including splicing and 3′-end processing. After export, associated pathways contribute to translation and nonsense-mediated mRNA decay, a quality-control process that helps identify problematic messenger RNAs. This change in functional context allows the same cap-linked system to participate across multiple stages of RNA use.
A useful study can follow the transcript across successive stages: cap recognition during nuclear production, pre-mRNA splicing, 3′-end processing, export from the nucleus, and post-export regulation. Examining these stages together is important because CBC activity connects them. It also helps distinguish effects on RNA maturation from effects on later translation or quality control.
Such studies can show how newly produced transcripts are prepared for use and how their handling changes after nuclear export. By examining CBC-linked effects on splicing, 3′-end processing, export, translation, and nonsense-mediated decay, researchers can connect RNA processing with broader post-transcriptional regulation rather than treating each event as an isolated step.
CBC provides a link between the production of messenger RNA and the systems that mature, export, translate, and monitor it. Changes affecting these connected stages could influence how gene expression is regulated in cells. For this reason, studying CBC-associated pathways offers biological context for understanding normal development as well as disease-related disturbances in RNA regulation.