What is the mechanism of the kinetic inhibition reaction of the enzyme?
The inhibition of an enzyme referred to the phenomenon where the reaction rate of the enzyme was reduced after the combination of certain substances with the enzyme. Inhibition agents can be divided into two categories: irreversible and irreversible. Reversible inhibition agents include competitive inhibition agents, non-competitive inhibition agents, and anti-competitive inhibition agents. 1. The competitive inhibition competed with the same active site as the base, and the inhibition could be alleviated by increasing the concentration of the base. 2. Non-competitive inhibition agents could bind to both the protein and the protein, and their inhibition was not affected by the concentration of the protein. 3. Anti-competitive inhibition agents only bind to the complex of the ester-base, and their inhibition effect is smaller at low concentration of the base. These different suppressive effects could be described by the corresponding modified Mie equation. Read more exciting novels for free
Diagram of the Inhibition Reaction
The principle of the inhibition reaction can be divided into competitive inhibition and non-competitive inhibition: 1. ** competitive inhibition **: A competitive inhibition agent will compete with the base for the active site of the protein, thereby suppressing the activity of the protein. In this case, both the initiator and the reagent could bind to the active site of the reagent. Due to the existence of the initiator, the chances of binding the reagent to the reagent were reduced, resulting in a decrease in the rate of the reaction. 2. ** Non-competitive Inhibition **: A non-competitive inhibition agent will bind to a site other than the active site of the protein, thereby suppressing the activity of the protein. This binding method changed the structure of the protein, which reduced the affinity of the active center of the protein to the protein. Even if the concentration of the protein increased, the reaction rate of the protein would not increase. For example, in the pesticide residue detection method, the target pesticide's inhibition of a specific reagent was an inhibition reaction. The specific reagent could catalyze the conversion of the reagent into a reagent when there was no pesticide. If the test sample contained the target pesticide, the pesticide would interact with the reagent to inhibit the activity of the reagent, thereby indirectly determining the level of pesticide residue in the sample. Also, in terms of whiteness, 4 -Butylated Resorcinol (577) mainly achieved whiteness and freckles by suppressing the activity of "Tyrosinase" and "Trp - 1." The inhibition of "Tyrosinase" may involve the principle of competitive or non-competitive inhibition. When constructing a nanoase sensor array to detect substances, for example, using 2D-MOF nanoase to detect phosphorus, the inhibition of phosphorus on the activity of 2D-MOF peroxide-like was also an inhibition reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
mechanism of the cycloaddition reaction
The cycloaddition reaction was a bimoleral reaction in which the carbon atoms of the end groups of two molecules in a Conjugated System joined together to form a ring. When forming a sigma-bond in the cycloaddition reaction, the carbon atoms of each pair of end groups could be in the same or different faces. If the polyene reagent has a substitution, then the product molecules may have different, recognizable structural characteristics. According to the principle of conservation of molecular orbit, the main way of cycloaddition reaction could be determined: when the sum of the number of carbon atoms in the two reaction molecules was an integral multiple of four, the thermochemical reaction was mainly carried out in the same face-different face or different face-same face way, and the photochemical reaction was mainly carried out in the same face-same face or different face-different face way. When the sum of the number of carbon atoms in the two reaction molecules is an even number that is not an integral multiple of four, the thermochemical reaction is mainly carried out in the same face-same face or different face-different face manner, and the biochemical reaction is mainly carried out in the same face-different face or different face-same face manner. For example, the sum of the number of carbon atoms in the Diels-Alder reaction was 6, which was an even number that was not an integral multiple of four. The thermochemical reaction was mainly carried out in the same face-same face or different face-different face manner. In addition, taking the "cycloaddition/ring-opening" reaction of bicyclo [1.1.0] butanes (BCPs) and triazinane reported by Peng Shiyong's research group of Wuyi University as an example, the cycloaddition followed a step-by-step (3 + 2 + 2) instead of (4 + 3) cycloaddition. It involved the SSN2-like addition of formaldimine and Lewis acid activated BCPs. The possible mechanism was: first, B(C6F5)3 activated 2a to form complex I; then, formaldimine (formed in place from triazinane 1a) and I carried out a N-like addition to form intermediate II; then, it reacted with another formaldimine to form intermediate III; finally, the molecular cycle released the B(C6F5)3 catalyst to form product 3a. Fantasy Realm is equally exciting. Everyone is welcome to click and read it!
The mechanism of the cycloaddition reaction
The cycloaddition reaction was a bimoleral reaction in which the carbon atoms of the end groups of two molecules in a Conjugated System joined together to form a ring. For the cycloaddition reaction, from the perspective of the molecular orbital symmetries conservation principle, when the sum of the number of carbon atoms in the two reaction molecules was an integral multiple of four, the thermochemical reaction was mainly carried out in the same face-different face or different face-same face mode, and the photochemical reaction was mainly carried out in the same face-same face or different face-different face mode. When the sum of the number of carbon atoms in the two reaction molecules is an even number other than four, the thermochemical reaction is mainly carried out in the same face-same face or different face-different face mode, and the biochemical reaction is mainly carried out in the same face-different face or different face-same face mode. The frontier orbital (FMO) theory believed that in a bimoleral photoreaction, both components were excited molecules with two single electrons. The Mo occupied by a single electron was also called SOMO. The cycloaddition method under illumination was: The two SOMOs with higher energy of the two components combined to form a single bond. However, this was only a part of the general bimoleral photoreaction. It was related to the cycloaddition reaction. The specific reaction mechanism was more complicated and different reagent systems might be different. Fantasy Realm is equally exciting. Everyone is welcome to click and read it!
The mechanism of the substitution reaction is
There were two mechanisms for the substitution reaction: 1. ** Bimoleral Nucleic Substitution Reaction (Sn2)**: - This was a bimoleral reaction, and the reaction rate depended on the concentration of the halon and the concentration of the nuclophile. - The reaction was completed in one step. During the reaction process, the central carbon atom of the cleaved carbon dioxide was attacked by the nuclophile and left by the leaving group at the same time, and it would go through a transition state. In the transition state, the nuclophile and the cleaved carbon dioxide were connected by a partial bond, and the leaving group and the cleaved carbon dioxide were also connected by a partial bond. - The reaction process was accompanied by a transformation of the configuration, known as the Walden transformation, which was an important sign of the Sn2 reaction. For example, R - 2 -Bromobutan would be converted to S - 2 -Butanol when 2 -Bromobutan was being digested. 2. ** Unimoleral Nucleophile Substitution Reaction (sn1)**: - The reaction was carried out in two steps. The first step was to undergo a slow reaction of heterocracking of the aromatic compounds to form the active intermediate carbon ions. This step was the step that determined the reaction rate. The second step was to combine the carbon ions with the nuclophile to form a product. - The product was racemized. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Diels Alder reaction mechanism
The reaction mechanism of the Diels-Alder reaction was generally considered to be a cycloidal reaction through a circular transition state. During the reaction, the two reagents were close to each other and interacted with each other to form a ring-shaped transition state, and then gradually transformed into product molecules. That is, the breaking of the old bond and the formation of the new bond were coordinated and completed in the same step. There was no intermediate formation. From the perspective of orbital theory, when a dienophile with an electron donating group and a dienophile with an electron withdrawing group were reacting, the smaller the energy difference between the frontier orbitals (the HOMO of the diene and the LUMO of the dienophile), the more stable the interaction between the orbitals was, thus making the reaction easier to carry out (electron demanding type). Similarly, the reaction between a dienophile with an electron donating group and a dienophile with an electron withdrawing group was also easier to carry out (anti-electron demanding type). The reaction was carried out according to the cis-addition of the cooperative reaction, and the endo addition product was generated first (endo rule). However, in the Diels-Alder reaction, although the second-order orbital interaction could roughly explain this rule, the endo/exo selectively generated exo products were also affected by the size. In addition, the Diels-Alder reaction within the molecules was not completely applicable to the endo rule due to the fixed ring structure and the low degree of freedom of the configuration. According to the theory of organic electrons, the addition product of the Diels-Alder reaction was more likely to place the substitution group in the ortho-or para-position (ortho-and para-rules). The details could be explained by the frontier orbital theory, that is, the reaction points with large HOMO-LUMO coefficient were easy to overlap and add. The cyclo-transition state of the diene could be added when the s-cisoid structure, but the s-transoid structure could not undergo the Diels-Alder reaction. Fantasy Realm is equally exciting. Everyone is welcome to click and read it!
Second order kinetic reaction characteristics
The second-order kinetic reaction had the following characteristics: 1. The reaction rate is proportional to the square of the concentration of a certain reagent. 2. The unit of the rate constant k is (concentration Ruler, time Ruler), for example, mole Ruler·dm cubic·s Ruler. 3. 1/CA is linear with t (CA is the concentration of the reagent, t is time). 4. Half-life t1/2 = 1/(kCa0), the half-life is inverse to the initial concentration Ca0. 5. For a second-order reaction, the rate equation was 1/C - 1/C0 = Kt (C was the concentration at time t, C0 was the initial concentration, and K was the rate constant). If 1/C was plotted against time on ordinary coordinate paper, a straight line could be obtained, and the slope of the straight line was K. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
As the reaction progressed, the competitive inhibition became more and more effective
This statement was wrong. The competitive inhibition competed with the active site of the reagent. The higher the concentration of the reagent, the greater the probability of binding to the active site of the reagent, and the weaker the inhibition of the competitive inhibition. As the reaction progressed, the concentration of the substances decreased. At this time, the inhibition effect might become stronger, but it was not the effect of the inhibition itself, but the relative change caused by the decrease in the concentration of the substances. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the reaction mechanism of glucose and alcohol?
Frucose and alcohol did not react because they were both non-polar substances in organic matter. However, there were two ways that the sugar could enter glycolsis and ferment into alcohol. In addition, when drinking honey (containing a lot of syrup) after drinking alcohol, the syrup in the honey will have a series of reactions with alcohol after entering the human body, which will help the liver expel alcohol from the body, thus playing the effect of relieving alcohol and protecting the liver. However, the exact molecular mechanism of the specific reaction in this process has not been found, so it cannot be accurately answered. At the same time, glucose and alcohol could be dissolved in each other. This was based on the principle of similar compatibility because they were both non-polar molecular substances. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The mechanism of the browning reaction of Ascorbic acid
The mechanism of the inhibition of the browning of the body by the ester was that it was both an organic acid and a reducing agent. It could reduce the oxided Quinones to the vitamins and prevent the Quinones from further spontaneously agglomerating to form a coloring substance, thereby suppressing the activity of the Polygala Oxidases (PPO). It could also reduce the oxygen content to suppress the browning reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the mechanism and characteristics of the reaction of the catalyze of alkene?
The reaction mechanism of the graphene was: in the presence of platinum, and platinum, the hydrogen molecules attached to the catalyst would form active hydrogen atoms. These hydrogen atoms would react with the graphene that had been weakened by the catalyst to form the corresponding alkyls, and heat would be released (this heat was called the heat of dehydration). This process changed the reaction pathway and reduced the activation energy. Its characteristics included: 1. From an energy point of view, the reaction will release heat, and the more alkyls on the double bond carbon atoms, the lower the heat of dehydration, and the more stable the alkene; the trans-Isomerizer is more stable than the cis-Isomerizer; for example, the heat of dehydration of ethyne is-313.8kJ·mole- 1, which is twice as large as that of ethene (-274.4kJ·mole-1), so the stability of ethyne is less than that of ethene. 2. In some reactions, it was possible to use a catalyst with a lower activity to make the alkyne remain at the alkene stage. 3. There were some special mechanisms for the synthesis of complex molecules, such as hydrogen atom transfer and co-catalyze. The hydrogen atom transfer (HAT) was a key step in the radical reaction. In the radical synthesis of alkene, it was a powerful tool for the synthesis of complex molecules due to its simple operation and the complementary advantages of the organic metal method. There was also a double catalyst strategy such as the coordinated hydrogen atom transfer (cHAT) for the reduction of alkene. In addition, a common mechanism for the use of Mn complex in the catalyze of hydrogen reactions was the interaction between the functional groups in the complex and the catalyst to form a coordination bond. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>