Enzymes

1
Enzymes

• A protein catalyst
• Enzymes are important proteins found in living
  things. An enzyme is a protein that changes the
  rate of a chemical reaction.
• They speed metabolic reactions.

2
A specific enzyme catalyzes each cellular reaction

• Enzymes are selective
• This selectivity determines which chemical
  reactions occur in a cell

3
How an enzyme works
Enzyme(sucrase
Substrate(sucrose)
Activesite

• The enzyme is unchanged
• and can repeat
• the process

Glucose
Fructose
1
Enzyme available with empty active site
4
Products are released
3
2
Substrate is converted to products
Substrate binds to enzyme with induced fit
4
Enzyme video clipdouble click
5
The cellular environment affects enzyme activity

• Enzyme activity is influenced by
• temperature Denaturationprocess
• salt concentration in which protein
  unravels
• pH losing its
  shape hence function