amino acids i (m.haris lucky)ff (2)
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1-Explain the structure of aminoacids with dierent types of sidechain
(non-polar,polar, acidic, basic,aromatic, aliphatic)
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2- Describe with examples thefollowing classes of amino acids,their properties and theirbiomedical importance.
i. Glucogenic and ketogenic aminoacids.
ii. Non-protein amino acids. iii. Essential and non-essential amino
acids
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Amino acids are compounds thatcontain an —NH2 group and a —C2H
group
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!roteins can be broken do"n intosmaller units b# h#drol#sis, thesesmall units , monomers o$ proteinsare called as amino acids
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%ore than &'' amino acids occurnaturall#, but 2' o$ them areespeciall# important.
(hese 2' amino acids are thebuilding blocks o$ proteins. All are α-
amino acids. (he# dier in respect to the group
attached to the α carbon.
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(he properties o$ the amino acid*ar# as the structure o$ + *aries.
CC CC
OO
OO – –
RRRR
HH
HH33NN++
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orm "hen the acid group CH)o$ one amino acid oins "ith the
amine group NH2) o$ a secondamino acid
ormed through condensation
/roken through h#drol#sis
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FigureFigure
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Each amino acid is assigned a & letteror 0 letter s#mbol
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Gl#cine is the simplest amino acid.1t is the onl# one in that is achiral.
CC CC
OO
OO – –
HH
HH
HH33NN++
GlycineGlycine
(Gly or G)(Gly or G)
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CC CC
OO
OO – –
CHCH33
HH
HH33NN++
Alanine Alanine
(Ala or A)(Ala or A)
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CC CC
OO
OO – –
CH(CHCH(CH33))22
HH
HH33NN++
ValineValine
(Val or V)(Val or V)
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CC CC
OO
OO – –
CHCH22CH(CHCH(CH33))22
HH
HH33NN++
LeucineLeucine
(Leu or L)(Leu or L)
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CC CC
OO
OO – –
CHCH33CHCHCHCH22CHCH33
HH
HH33NN++
!oleucine!oleucine
(le or )(le or )
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CC CC
OO
OO – –
CHCH33"CH"CH22CHCH22
HH
HH33NN++
#e$%ionine#e$%ionine
(#e$ or #)(#e$ or #)
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&roline&roline
CC CC
OO
OO – –
CHCH22
HH
HH22NN++
HH22CC
CCHH22
(&ro or &)(&ro or &)
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&%enylalanine&%enylalanine
CC CC
OO
OO – –
CHCH22
HH
HH33NN++
(&%e or F)(&%e or F)
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'ry$o%an'ry$o%an
CC CC
OO
OO – –
CHCH22
HH
HH33NN++
NN
HH
('r or )('r or )
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A!aragine A!aragine
CC CC
OO
OO – –
HH
HH33NN++
HH22NNCCCHCH22
OO
(A!n or N)(A!n or N)
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Glu$a*ineGlu$a*ine
CC CC
OO
OO – –
HH
HH33NN++
HH22NNCCHCCH22CHCH22
OO
(Gln or )(Gln or )
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CC CC
OO
OO – –
CHCH22OHOH
HH
HH33NN++
"erine"erine
("er or ")("er or ")
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CC CC
OO
OO – –
CHCH33CHOHCHOH
HH
HH33NN++
'%reonine'%reonine
('%r or ')('%r or ')
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A!ar$ic Aci, A!ar$ic Aci,
CC CC
OO
OO – –
HH
HH33NN++
OOCCCHCH22
OO
– –
(A! or -)(A! or -)
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Glu$a*ic Aci,Glu$a*ic Aci,
CC CC
OO
OO – –
HH
HH33NN++
OOCCHCCH22CHCH22
OO
– –
(Glu or )(Glu or )
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'yro!ine'yro!ine
CC CC
OO
OO – –
CHCH22
HH
HH33NN++
OHOH
('yr or /)('yr or /)
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CC CC
OO
OO – –
CHCH22""HH
HH
HH33NN++
Cy!$eineCy!$eine
(Cy! or C)(Cy! or C)
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CC CC
OO
OO – –
CHCH22CHCH22CHCH22CHCH22NNHH33
HH
HH33NN++
Ly!ineLy!ine
++
(Ly! or 0)(Ly! or 0)
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CC CC
OO
OO – –
CHCH22CHCH22CHCH22NNHHCCNNHH22
HH
HH33NN++
Arginine Arginine
++NNHH22
(Arg or R)(Arg or R)
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Hi!$i,ineHi!$i,ine
CC CC
OO
OO – –
HH
HH33NN++
CHCH22
NHNHNN
(Hi! or H)(Hi! or H)
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!( (1% HA33
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