Sequential Binding Model
Sequential Binding Model - Related Videos
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.
01:21
Sequential Games
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2025
Sequential games involve players making decisions one after another, with each player considering the prior decisions of other players before deciding their own strategy. The order of these decisions is crucial, as each decision influences subsequent ones, affecting the overall outcome. Decision trees are valuable tools in illustrating these games, helping visualize each possible decision and its consequences, allowing players to anticipate and plan strategies effectively. Consider two coffee...
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,...
01:24
Sequential Game: Backward Induction
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2025
Backward induction is a technique for solving sequential games. It involves analyzing the game starting from the end and working backwards to the beginning. This method helps players determine their best strategies by anticipating how others will react at each stage of the game, ultimately leading to the Nash equilibrium. Imagine two beverage companies, FreshFizz and CoolBrew, deciding whether to enter a new market. FreshFizz moves first and must choose to enter or stay out. If FreshFizz...
01:49
Conserved Binding Sites
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2020
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function. Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
FAQs
The first ligand does more than occupy an available site: its attachment changes the conformation of one subunit and modifies the properties of neighboring sites. Subsequent binding events therefore occur in a protein whose local environment has already changed. This progressive transmission creates a sequence of related conformational states and links individual binding events to the behavior of the whole multimeric protein.
Intermediate states explain why a protein can respond gradually rather than behaving as if it were entirely inactive or fully active. Each state can reflect a different pattern of ligand occupancy and altered site properties. Accounting for these states helps connect molecular structural changes with the shape of binding behavior and with biological responses to changing ligand concentrations.
An instantaneous switch treats the protein as moving directly between fully inactive and fully active forms. The Sequential Binding Model instead describes conformational changes that are transmitted progressively as ligands bind. This distinction matters when interpreting proteins whose subunits do not change properties simultaneously, because intermediate states can influence both apparent ligand affinity and the overall regulatory response.
As ligand concentration changes, the relative occurrence of different binding and conformational states can change. Sites altered by earlier binding events may have different properties from unoccupied sites, so later binding is influenced by the protein's current state. The model therefore provides a framework for relating ligand concentration to changing affinity and to the resulting functional response.
Binding curves provide a way to examine how ligand occupancy changes as ligand concentration varies. Their patterns can be interpreted alongside the model's predicted sequence of altered site properties and intermediate states. This analysis connects measurable binding behavior with molecular events inside the protein, helping investigators evaluate how progressive conformational changes contribute to cooperativity.
For hemoglobin, the model supplies a molecular framework for relating ligand binding across multiple subunits to changes in protein behavior. Binding at one site can be considered in the context of conformational effects transmitted to neighboring sites. This perspective helps connect hemoglobin's multimeric structure with its response to changing ligand concentrations and with cooperative binding behavior.
Regulatory enzymes can contain multiple interacting sites whose properties change as ligands bind. Applying this framework helps relate those site-to-site effects to allosteric regulation, rather than treating each binding event as independent. It also supports analysis of how protein structure, ligand affinity, and changing ligand concentrations combine to influence enzyme function.