1 anomeric carbon. 2 3 4 flat ring (haworth projection) just gives the relative positions of the h...
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anomeric carbon
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Flat ring (Haworth projection) just gives the relative positions of the H and OH at each carbon, one is “above” the other. But it does not tell the positions of the groups relative to the plane of the ring (up, down or out)
Relationship between Haworth (flat ring) depiction and chair-form
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5Polymers are built by removing a molecule of water
between them, known as dehydration, or condensation.
R-OH + HO-R
→ R-O-R + HOHThis process does not happen by itself
(It is NOT like glucose ring formation)
Rather, like virtually all of the reactions in a cell,
it requires the aid of a CATALYST
Dimer formation
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6AND: Polymers are broken down by the reverse process, ADDING a molecule of water between them, known as
DIMER HYDROLYSIS
R-O-R + HOH→ R-OH + HO-R
This process does not happen by itself
Rather, like virtually all of the reaction in a cell, it requires the aid of a CATALYST
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CHOH2
12
3
45
B eta-g lucose
Building a polymer from glucose
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CHOH2
12
3
45
B eta-g lucose
CHOH2
12
3
45
B eta-g lucose
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Glycosidic bondAnomeric carbon is always one partner
Beta conformation is now locked in here But not here
C4 = equatorial out (always in glucose)
C1 = equatorial out (in beta glucose)
The two glucose molecules are connected in a ~straight line in cellobose
O
H
H
H
CHOH2HO
HO HO
HH
4
O
H
H
H
CHOH2
HO
OHHO
HH
4
Beta-glucose residue “Beta”-glucose residue
Cellobiosewith right-hand glucose shown as beta
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Glycosidic bondAnomeric carbon is always one partner
Alpha conformation of –OH is now locked in here
But not here
C4 = equatorial out (always in glucose)
C1 = axial down (in alpha glucose)
O
H
H
H
CHOH2HO
HO HO
H
H
4
O
H
H
H
CHOH2
HO
OH
HO
H
H
4
Alpha-glucose residue
“Beta”-glucose residue
Maltosewith right-hand glucose shown as beta
The two glucose molecules are connected with an angle between them in maltose
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One is forced to draw strange “elbows” when depicting disaccharides using theHaworth projections. Such elbows do not exist in reality.
(here the C1 OH is “above” and the C4 OH is “below”Whereas we just saw in actuality that they are both equatorial in beta glucose)
Equatorial bond is above the H
Equatorial bond is below the H
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Tinker toys
Starch or glycogen chain
down
out
H
H
CelluloseTinker toys
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4-1
4-1
4-1
4-1
4-14-1
6-14-1 4-1
4-14-1
Branches at carbon 6 hydroxylBranching compact structureStarch or glycogen granules, A storage form of glucose for energy
Branching in starch
C6
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14NucleusCytoplasm
Organelles
Starch granules
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or glycogen chain
down
out
H
H
Cellulose
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16Cellulose
Cell wall of green algae
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17anomeric carbon
anomeric carbon
fructose riboseglucose glucose
From handout 2-6
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More sugars:
Mannose C6H12O6 (different arrangement of OH’s and H’s)
Galactose C6H12O6 (different arrangement of OH’s and H’s)
Deoxyribose C5H10O4 (like ribose but C2’s OH substituted by an H)
More disaccharides
Lactose = b-1-glucose to C4 of galactose (milk sugar)
Sucrose = b-2-fructose to C1- a-1-glucose (table sugar, cane sugar)
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(Insect exoskeleton)
(Bacterial cell walls)Metabolic intermediate
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20Lipids
• Soluble in organic solvents (like octane, a hydrocarbon)
• Heterogeneous class of structures
• Not very polymer-like (in terms of covalently bonded structures)
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A steroid
(Abbreviation convention: Always 4 bonds to carbon. Bonds to H not shown.)
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A fatty acid
Fats
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A trigyceride (fat)
Ester (functional group, acid + alcohol)}
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trans
cis
cis
C C| |
HH
HH| |
| || C C| |
HH|| ||
- 2H
X
Free rotation about single bonds
No free rotationabout double bonds
C C|
|H
H
||
|
|
X
trans
cis
Solid fats
Oils
Effect of fatty acid structure on physical properties
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Fatglobule
Nucleus
Adipocyte (fat storage cell)
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R=H: a phosphoester(phosphoric acid + alcohol)
In this case: phosphatidic acid
}Handout 2-10
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[HO]
[HO]
Handout 2-10
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R=another alcohol:A phospho-diester
}HO
HO
Handout 2-10
HO –CH2CH2N+H3
(alcohol = ethanolamine)
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29HOH
HOH
Phosphate head
2 fatty acid tails each
Biological membranes are phospholipid bilayers
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Incidentally, note the functional groups we have met so far:
HydroxylAmineAmideCarboxylCarbonylAldehydeKetoneEster: Carboxylic acid ester
Phosphoester
And:
Glycosidic bondsC=C double bonds (cis and trans)
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Amino acids (the monomer of proteins)
PROTEINS
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At pH 7, ,most amino acids are zwitterions(charged but electrically neutral)
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+OH- ( -H+)
+H+
Net charge
50-50 charged-uncharged at ~ pH9 (=the pK)50-50 charged-uncharged at ~ pH2.5 (=the pK)
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Numbering (lettering) amino acids
Alpha-carbon
Alpha-carboxyl (attached to the α-carbon)Alpha-amino
β
γδ
ε
ε-amino group
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36Amino acid examples
Molecular weights 75 – 203
(MW)
Glycine (gly) Side chain = H Smallest (75)
Aspartic acid
(asp, aspartate) One – charge
β-carboxyl:
-CH2-COOH
Tryptophan (trp) 5+6 membered rings
Hydrophobic, largest (203)
Lysine (lys) One + charge ε-amino
Alanine (ala) One carbon (methyl group)
-CH3
Arginine
(arg, guanido group)
One + charge -(NH-C (NH2)NH2)+,
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38Shown uncharged (as on exams)
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Amino acids in 3 dimensions
• Asymmetric carbon (4 different groups attached)
• Stereoisomers• Rotate polarized light• Optical isomers • Non-superimposable• Mirror images
• L and D forms
From Purves text
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Mannose
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Condensation of amino acids to form a polypeptide(must be catalyzed)
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Parts of a polypeptide chain
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Handout 3-3
(Without showing the R-groups)
The backbone is monotonous It is the side chains that provide the variety
The backbone is monotonous
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“Polypeptides” vs. “proteins”
• Polypeptide = amino acids connected in a linear chain (polymer)
• Protein = a polypeptide or several associated polypeptides (discussed later)
• Often used synonymously
• Peptide (as opposed to polypeptide) is smaller, even 2 AAs (dipeptide)