Isoelectric point of protein
• pH < pI
• Protein is positive charge.
• pH > pI
• Protein is negative charge.
One subunit of the enzyme glyceraldehyde-3-phosphate dehydrogenase from Bacillus stearothermophilus.
Major biological functions of protein
• Catalytic proteins: A+B C
• Structural proteins
• Transport proteins
• Regulatory proteins
• Protective proteins : antibodies
enzyme