2007.x.jprotein structure function - sinica
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Protein Structure-function
Dr. Rita P.-Y. Chen陳佩燁博士
中央研究院生化所
Amino acid
•Chiral center•Optically active: rotate plane-polarized light•Amino acid in protein: L stereoisomer
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aliphatic amino acid structures
CH CH3
CH2
CH3
Isoleucine (I)(Ile)
Side Chains with Alcohol Groups• Serine (Ser, S) and Threonine (Thr, T) have
uncharged polar side chains
Catalytic role, phosphorylation, O-linked glycosylation, hydrogen bond
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Structures of aspartate, glutamate, asparagine and glutamine
N-linked glycosylationChargeHydrogen bond
Structures of histidine, lysine and arginine
δ-Guanido groupimidazole group
π
τ
Metal chelating
Charge, H bond
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Methionine and cysteine
First a.a. Catalytic role, disulfide bond
Fig 3.4 Formation of cystine
Disulfide bond
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Aromatic amino acid structures
phosphorylation
Indole group
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Proline has a nitrogen in the aliphatic ring system
• Proline (Pro, P) - has a three carbon side chain bonded to the α-amino nitrogen
• The heterocyclic pyrrolidinering restricts the geometry of polypeptides
φ= -60
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+180 degree
Newman projections
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Asp100
Arg103
Ion pair (i, i+3)
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Antiparallel
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Antiparallel β-strand Parallel β-strand
Type I turn Type II turn
Hydrogen bond between i, i+3
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Chou and Fasman (1977) JMB, 115, 135-175
II’
II
II’
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TIBS 1987
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JMB (1989)206, 759-77