Title: Amino Acids

Q: Name this Amino Acid and its properties
A: Lysine (Lys, K)
- basic amino acid (side chain is + charged)
- pKa ca 10.5
- hydrophilic (lots of possibilities for hydrogen bridges)

Q: Name this Amino Acid and its properties
A: Arginine (Arg, R)
- basic amino acid (+charged side chain)
- pKa ~12
- Guanidinium group(2x NH2+)
- hydrophilic (lots of possibilities for hydrogen bridges)

Q: Name this Amino Acid and its properties
A: Histidine (His, H)
- basic amino acid (+ charged side chain)
- hydrophilic (lots of possibilities for hydrogen bridges)
- Ring like structure in side chain
- pKa ~6

Q: Name this Amino Acid and its properties
A: Serine (Ser, S)
- has an OH R group (polar)
- uncharged R group
- polar

Q: Name this Amino Acid and its properties
A: Threonine (Thr, T)
- uncharged side group
- polar (OH group)
- alcohol

Q: Name this Amino Acid and its properties
A: Asparagine (Asn, N)
- uncharged side group
- polar
- amide group H2N

Q: Name this Amino Acid and its properties
A: Glutamine (Gln, Q)
- polar
- uncharged side group
- amide group (one CH2 longer than Asparagine)

Q: Name this Amino Acid and its properties
A: Aspartic Acid (Asp, D)
- negatively charged side group (acidic)
- CH2 shorter of Glutamic acid
- pKa ~ 3.9

Q: Name this Amino Acid and its properties
A: Glutamic Acid (Glu, E)
- longer version of Aspartic Acid (+CH2)
- negative charged side chain (acidic)
- hydrophilic
- pKa ~4.3

Q: Name this Amino Acid and its properties
A: Alanine (Ala, A)
- hydrophobic ( non polar)
- uncharged side chain
- hydrophobic

Q: Name this Amino Acid and its properties
A: Valine (Val, V)
- V shape -> branched amino acid
- non polar (uncharged side chain)

Q: Name this Amino Acid and its properties
A: Isoleucine (Ile, I)
- non polar
- uncharged side chain
- Non-branched version (ISOmer of leucin
- hydrophobic

Q: Name this Amino Acid and its properties
A: Leucine (Leu, L)
- branched version of Isoleucine (which is non-branched)
- hydrophobic, non-polar

Q: Name this Amino Acid and its properties
A: Methionine (Met, M)
- non-polar (hydrophobic)
- contains sulphur
- every protein starts with it (encoded by start codon)

Q: Name this Amino Acid and its properties
A: Phenylalanin (Phe, F)
- has phenylgroup attached to Alanin
- non-polar (hydrophobic)
- aromatic ring

Q: Name this Amino Acid and its properties
A: Tyrosine (Tyr, Y)
- aromatic ring
- polar OH-group (alcohol)
- genereally hydrophobic

Q: Name this Amino Acid and its properties
A: Tryptophan (Trp, W)
- hydrophobic (non-polar)
- aromatic ring
- absorbs UV

Q: Name this Amino Acid and its properties
A: Cysteine (Cys, C)
- non polar (hydrophobic)
- contains sulphur

Q: Name this Amino Acid and its properties
A: Glycine (Gly, G)
- smallest Amino acid
- Hydrophobic (non-polar)

Q: Name this Amino Acid and its properties
A: Proline (Pro, P)
- hydrophobic, non polar
- side group linked to amine group (cyclic structure)
- plays key role in protein folding

Q: Where do I see if an amino acid is acidic?
A: R is negatively charged
e.g.:

Q: Where do I see if an amino acid is basic?
A: R is positively charged
e.g.: