Protein - The specificity of enzymes | cypenv.info
Quiz on Lecture Introduction to Enzymes The relationship between an enzyme and a reactant molecule can best be described as: a) a temporary association. b) an association stabilized by d) a permanent mutual alteration of structure. The velocity is directly proportional to enzyme concentration and hyperbolic The chemical basis of enzyme specificity is the complimentary relationship a structural fit of the S into the E active site (a "lock and key" kind of fit) and a chemical. focus on the structures and functions of enzymes involved in the biosynthesis of unusual di- .. determinants of specificity and paralogues to study function diversification. The HADSF However, covalent connection via the sugar ring has little energetic .. Mo Cleland participated in Schramm's Ph.D. thesis exam. Schramm.
Explain the relationship between enzyme structure and specificity?
It is also called moderate specificity. Here the enzyme is specific to a bond and groups surrounding the bonds. Group specificity is more than that of bond specificity. Endopeptidases and exopeptidases two general classes of proteinases are classical examples for group specificity.
Pepsin, a digestive enzyme of stomach produced by chief cells, can hydrolyze a peptide bond in which the amino group is contributed by an aromatic amino acid such as phenyl alanine, tyrosine and tryptophan.
explain the relationship between enzyme structure and specificity? | Yahoo Answers
Trypsin, a serine protease of digestive system, can hydrolyze a peptide bond in which amino group is contributed by any basic amino acid such as lysine, arginine and histidine. Chymotrypsin, a digestive enzyme component of pancreatic juice, can hydrolyze a peptide bond in which the carboxyl group is contributed by any aromatic amino acid phenylalanine, tyrosine and tryptophan. Similarly, aminopeptidase and carboxypeptidase can hydrolyze any peptide bond of a protein from N-terminal and C-terminal respectively.
Substrate specificity Substrate specificity is also called as absolute specificity, since here the specificity is very high. Enzymes showing substrate specificity are specific only to one substrate and one reaction. Optical specificity Optical specificity of enzyme is also called as stereo-specificity.
Here the enzyme is specific not only to substrate but also to its optical configuration. Optical specificity of enzyme is considered as the highest specificity shown by any class of enzyme in the living world.
L-amino acid oxidase acts only on L-amino acids, similarly D-amino acid oxidase acts only on D-amino acids. Another good example for optical or stereo specificity of enzyme is the action of amylases.
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Starch, glycogen and cellulose are the polymer of glucose molecules joined by glycosidic linkages. Geometrical specificity In geometrical specificity, single enzyme can act on different substrates having similar molecular geometry and hence here specificity is very less. This new substance is called the "product. In some cases the environment can cause the enzyme to stop working or even unravel.Biology- Factors Affecting Enzyme Activity
When an enzyme stops working we call it "denatured. Temperature - The temperature can affect the reaction rate.
The higher the temperature, the faster the reaction will occur. However, at some point the temperature will become so high that the enzyme will denature and stop working. An extreme pH high or low will typically slow the reaction or even stop the reaction altogether.
Concentration - A higher concentration of substrate or enzyme can increase the reaction rate. Inhibitors - Inhibitors are molecules that are specially made to stop the activity of enzymes. They may just slow down the reaction or stop it altogether. Some inhibitors bond with the enzyme causing it to change shape and not work correctly. The opposite of an inhibitor is an activator which can help to speed up the reaction. Interesting Facts about Enzymes Enzymes don't get used up after they do their job.
Biochemistry Multiple Choice Quiz: 15
They can be used over and over. Many drugs and poisons act as inhibitors to enzymes. Some snake venoms are inhibitors. Enzymes are often used in industrial applications such as food processing, paper manufacturing, and detergents. There is an enzyme in your saliva called amylase that helps to break down starches as you chew.