bio206 slide kuliah 6 - asam amino
TRANSCRIPT
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Biokimia
Kuliah 6Kuliah 6
Asam Amino
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Apa itu Asam Amino?
• Struktur umum asam amino
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Sifat umum asam amino
• Nilai pK (pK1, pK2, dan pKR)
• Nilai pK1 ≈ 2,2
• Nilai pK2 ≈ 9,4
• Bagaimana sifat asam amino pada pH • Bagaimana sifat asam amino pada pH fisiologi?
• Titik Isoelektris (pI) asam amino
• Asam amino adalah senyawa amfoter
• Asam amino adalah swtterion
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Kurva titrasi glisin
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Klasifikasi asam amino
• R bersifat non polar ( 9 asam amino)
• R polar, tidak bermuatan (6)
• R polar, bermuatan positif (3)
• R polar, bermuatan negatif (2)• R polar, bermuatan negatif (2)
• Cys dapat membentuk ikatan disulfida, dimer cystin
• Penting dalam menjaga kestabilan protein
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Ikatan disulfida
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Ikatan Peptida
• Polimerisasi a a terjadi melalui ik. Peptida
• Membentuk dipeptida, tripeptida, oligopeptida, polipeptida
• Ukuran polipeptida 40 – 4.000 aa
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Polipeptida, polimer linear
• Dengan 20 aa, ada 202 dipeptida berbeda
• Tripeptida ≈ 203 ≈ 8.000 tripeptida
• Polipeptida dengan 100 aa ?
• Polipeptida berbentuk planar
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Asam amino non standar
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Aa dengan fungsi spesifik
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