Biokimia 7 Protein.ppt [Read-Only] - USU...
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Biokimia kuliah 7 Protein
Transcript of Biokimia 7 Protein.ppt [Read-Only] - USU...
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Biokimiakuliah 7
Protein
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Fungsi protein
• Sebagai enzim
• Regulator enzim, mesenger kimia (hormon
• Transpor O2, glu, lipid, dll
• Gerak, kontraksi otot, pemisahan kroms
• Sensor, rhodopsin dalam retina
• Sistem imun, immunoglobulin
• Bagian struktural, kolagen dlm tulang, tendon, ligamen
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Tingkatan struktur protein
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Struktur sekunder
α heliks β sheet
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Paralel, anti paralel βsheet
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Protein fibrosa
Keratin, 2 pp Kolagen, 3 pp
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β sheet fibroin serat sutra
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Struktur tersier & quartener
1 pp memp 2 domain Hb dengan 4 sub unit
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Stabilitas protein
• Gaya elektrostatik (ik. Ion & van der waals)
• Ikatan hidrogen
• Interaksi hidrofobik• Interaksi hidrofobik
• Ikatan disulfida
• Denaturasi
• renaturasi