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Protein engineering
Content
• What is protein engineering
• Methods of protein engineering
• objectives of protein engineering
Protein engineering
• Protein engineering can be defined as the modification of protein
structure with recombinant DNA technology to get a desirable
function for better use in medicine, industry and agriculture.
Site directed mutagenesis
Change in nucleic acid sequence at a specific site is know as site
directed mutagenesis.
Site directed mutagenesis by oligonucleotide
primer
Random mutagenesis by error prone PCR
• Error prone PCR is a method by which random mutants may be
inserted into any piece of DNA.
• WAYS OF DOING MUTATION:
Use taq polymerase have no proof-reading ability
increasing the MgCl2 in the reaction
unequal concentrations of each nucleotide
DNA Shuffling
• Some proteins e.g interferons are coded by a family genes
• Its possible to recombine portion of these genes to generate chimeric
with unique properties
• This is known as DNA Shuffling
Objective of protein engineering
• The objectives of protein engineering is:
Improve protein stability
Modify cofactor requirement
 Increase enzyme activity
 Modify enzyme specificity
Increasing the Stability of Streptokinase
• Streptokinase (SK), a 47-kDa protein secreted by several species of β-
hemolytic streptococci, is a major blood clot-dissolving agent that is
used in the treatment of various circulatory disorders.
• SK combines human plasminogen (Hpg) molecules forming the
complex SK-HPG which activates HPG to plasmin (Hplm).
• Plasmin has the ability to degrade the fibrin matrix of blood clots but
it also cleaves SK at Lys 59 and 386
• To make SK less susceptible to cleavage by plasmin, Lys at 59 and 386
were changed to Glu by site directed mutagenesis.
• Glu was chosen to replace Lys because the length of the side chain
was similar.
Protein engineering

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Protein engineering

  • 2. Content • What is protein engineering • Methods of protein engineering • objectives of protein engineering
  • 3. Protein engineering • Protein engineering can be defined as the modification of protein structure with recombinant DNA technology to get a desirable function for better use in medicine, industry and agriculture.
  • 4. Site directed mutagenesis Change in nucleic acid sequence at a specific site is know as site directed mutagenesis.
  • 5. Site directed mutagenesis by oligonucleotide primer
  • 6. Random mutagenesis by error prone PCR • Error prone PCR is a method by which random mutants may be inserted into any piece of DNA. • WAYS OF DOING MUTATION: Use taq polymerase have no proof-reading ability increasing the MgCl2 in the reaction unequal concentrations of each nucleotide
  • 7. DNA Shuffling • Some proteins e.g interferons are coded by a family genes • Its possible to recombine portion of these genes to generate chimeric with unique properties • This is known as DNA Shuffling
  • 8.
  • 9. Objective of protein engineering • The objectives of protein engineering is: Improve protein stability Modify cofactor requirement  Increase enzyme activity  Modify enzyme specificity
  • 10. Increasing the Stability of Streptokinase • Streptokinase (SK), a 47-kDa protein secreted by several species of β- hemolytic streptococci, is a major blood clot-dissolving agent that is used in the treatment of various circulatory disorders. • SK combines human plasminogen (Hpg) molecules forming the complex SK-HPG which activates HPG to plasmin (Hplm). • Plasmin has the ability to degrade the fibrin matrix of blood clots but it also cleaves SK at Lys 59 and 386
  • 11. • To make SK less susceptible to cleavage by plasmin, Lys at 59 and 386 were changed to Glu by site directed mutagenesis. • Glu was chosen to replace Lys because the length of the side chain was similar.