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une ch 6

amino acids in proteins

QuestionAnswer
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 on 2012-08-08



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