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une ch 6
amino acids in proteins
| Question | Answer |
|---|---|
| The pKa for alpha-amino groups is | approximately 9.5 (8.8 - 11.0), protonated at pH of 7 with a positive charge. |
| The pKa for alpha-carboxyl groups is | approximately 2 (1.8 - 2.4), mostly dissociated at pH of 7 with a negative charge. |
| alanine | ala |
| arganine | arg |
| asparagine | asn |
| aspartate | asp |
| cysteine | cys |
| glutamate | glu |
| glutamine | gln |
| glycine | gly |
| histidine | his |
| isoleucine | ile |
| leucine | leu |
| lysine | lys |
| methionine | met |
| phenylalanine | phe |
| proline | pro |
| serine | ser |
| theonine | thr |
| tryptophan | trp |
| tyrosine | tyr |
| valine | val |
| Essential AA: Little Valentine Take My Heart, Practicing Love Improves The Art | Leucine Valine Tryptophan Methionine Histidine Phenylaline Lysine Isoleucine Threonine Arginine |
| Nonessential amino acids: Almost All Girls Go Crazy Grabbing Protracted Slug Testicles | Alanine, Asparagine, Glycine, Glutamate, Cysteine, Aspartate, Glutamine, Proline, Serine, Tyrosine |
| Which contain R-groups that are nonpolar, polar? | If an R-group contains an oxygen or a nitrogen, it is polar. If an R-group does not contain oxygen or nitrogen, it is nonpolar. |
| NOnpolar= | No Oxygen or Nitrogen in nonpolar R groups |
| Which R-groups are charged ? | GLAAH- It hurts to be shocked by something with a charge! Glu, Lys, Asp, Arg, His |
| polar groups: Seriously The Tyrone's Ass is Glowing | Ser, Thr, Tyr, Asn, Gln |
| What AA's can form salt bonds? | AG neg, AL pos Aspartic acid, Glutamic acid- neg Arginine, Lysine-pos Histidine is pos when ph>6 |
| Aspartic acid pka | 4 |
| glutamic acid pka | 4 |
| histidine pka | 6 |
| lysine pka | 10 |
| arginine pka | 12 |
| cysteine pka | 8 |
| tyrosine pka | 8 |
| positively charged R groups will be ____ if _____ | positive (+1, pka>ph |
| negatively charged R groups will be ____ if ____ | negative (-1), ph>pka |
| The charge on the alpha-carboxyl group is neutral if the pH of the solution is ____ and is negative if the pH of the solution is _____. | below 2, above 2 |
| The charge on the alpha-amino group is positive if the pH of the solution is _____ and is neutral if the pH of the solution is _____. | below 9.5, above 9.5 |
| how to calculate pL | pI = (pKa1 + pKa2)/2 e.g (pka-alpha-amino + pka-alpha-carboxyl)/2 e.g. (pka-alpha-amino + pka-R group)/2 |
| go over charges on proteins | in notebook and ch 6 problems |
| AA has a pos charge when | ph of solution<pL |
| AA has a neg charge when | ph of solution>pL |
| What is the charge of histidine below/above pka? | pka=6 ph>pka= neutral-no salt bonds ph<pka= positive |
Created by:
carolanimal
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