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How can we identify the active site of an enzyme?
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+ Biology
+ Enzymes
+ Biochemistry
+ Chemistry
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Michele Vang
How can we identify the active site of an enzyme?
The active site is usually a groove or pocket of the enzyme which can be located in a deep tunnel within the enzyme, or between the interfaces of multimeric enzymes.
The active site is usually a groove or pocket of the enzyme which can be located in a deep tunnel within the enzyme, or between the interfaces of multimeric enzymes.
The structure of an enzyme’s active site (and the rest of the enzyme) can be determined via crystallographic and other imaging techniques.
Determining the specific amino acids at the site however is a different matter.
Some tried and tested methods are:
“Freezing” the enzyme-substrate complex (ES) to render it inactive, then hydrolysing it to obtain the substrate which would still be bound to the catalytic amino acid. This can be done using a substrate analog which can form an ultra stable ES complex, which dissociates very slowly, or, by degrading the ES altogether as soon as the substrate is added.
Modifying the enzyme by chemically altering the amino acids one at a time, or by modifying its primary structure using proteases to remove certain amino acids at different locations.
Replacing amino acids at different positions by site directed mutagenesis. IF the replacement of one amino acid at a particular site causes a decrease in enzymatic activity, it means its part of the active site.
The structure of an enzyme’s active site (and the rest of the enzyme) can be determined via crystallographic and other imaging techniques.
Determining the specific amino acids at the site however is a different matter.
Some tried and tested methods are:
“Freezing” the enzyme-substrate complex (ES) to render it inactive, then hydrolysing it to obtain the substrate which would still be bound to the catalytic amino acid. This can be done using a substrate analog which can form an ultra stable ES complex, which dissociates very slowly, or, by degrading the ES altogether as soon as the substrate is added.
Modifying the enzyme by chemically altering the amino acids one at a time, or by modifying its primary structure using proteases to remove certain amino acids at different locations.
Replacing amino acids at different positions by site directed mutagenesis. IF the replacement of one amino acid at a particular site causes a decrease in enzymatic activity, it means its part of the active site.
The active site is usually a groove or pocket of the enzyme which can be located in a deep tunnel within the enzyme, or between the interfaces of multimeric enzymes.
The active site is usually a groove or pocket of the enzyme which can be located in a deep tunnel within the enzyme, or between the interfaces of multimeric enzymes.
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The structure of an enzyme’s active site (and the rest of the enzyme) can be determined via crystallographic and other imaging techniques.
Determining the specific amino acids at the site however is a different matter.
Some tried and tested methods are:
Hope this answers ur question…..
The structure of an enzyme’s active site (and the rest of the enzyme) can be determined via crystallographic and other imaging techniques.
Determining the specific amino acids at the site however is a different matter.
Some tried and tested methods are:
Hope this answers ur question…..
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