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Basicity of some amines
Amine Kb pKbAmmonia NH3 1.80E-05 4.74
Propylamine CH3CH2CH2NH2 4.70E-04 3.33
2-Propylamine (CH3) 2CHNH2 3.40E-04 3.47
Methylamine CH3NH2 4.40E-04 3.36
Dimethylamine (CH3) 2NH 5.40E-04 3.27
Trimethylamine (CH3) 3N 5.90E-05 4.23
Aniline C6H5NH2 3.80E-10 9.42
4-Methylaniline 4-CH3C6H4NH2 1.20E-09 8.92
2-Nitroaniline 1.50E-15 14.82
3-Nitroaniline 2.80E-13 12.55
4-Nitroaniline 9.50E-14 13.02
2
B + H2O HB+ + OH- Kb = a(HB+) x a((OH-)/[a(B) x a(H2O)]
The 21 amino acids found in eukaryotes.
(Grouped according to their side-chains' pKa values and charge at physiological pH 7.4)
The peptide bond
Polymerisation of ε-caprolactam to a polyamide (Nylon-6)
O
H2O
-Aminocapronsäure
CH
CHN
O
N
CH2
SH
O
CH
CH2
CHN
O
N
OCH2
OH
H
H H
H
a-helix
Primary structure: Amino acid sequence in a polypeptide (protein)
amino acids
CH
CHNH
O
NH
CH2
SH
O
OHCH
CH2
CHNH
O
NH
OCH2
OH
Hemoglobin (English pronunciation: /hiːməˈgloʊbɪn/; also spelled haemoglobin and abbreviated Hb or Hgb) is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates.
3D structure of the protein myoglobin showing colored alpha helices.
hemeprosthetic group, co-factor
Beta-meander motifPortion of outer surface Protein A of Borrelia burgdorferi complexed with a murine monoclonal antibody.
Psi-loop motifPortion of Carboxypeptidase A.
Die vier Ebenen der Proteinstruktur, von links nach rechts: Primärstruktur, Sekundärstruktur (β-Faltblatt unten, α-Helix oben), Tertiär- und Quartärstruktur.
a-helix-sheet
primary secondary tertiary quaternary
structure
The crystal structure of the chaperonin. Chaperonins assist protein folding.
Three possible representations of the three-dimensional structure of the protein triose phosphate isomerase. Left: all-atom representation colored by atom type. Middle: Simplified representation illustrating the backbone conformation, colored by secondary structure. Right: Solvent-accessible surface representation colored by residue type (acidic residues red, basic residues blue, polar residues green, nonpolar residues white)
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