1 bcm 3000 principles of biochemistry (semester 1 -2011/12)
TRANSCRIPT
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BCM 3000PRINCIPLES OF BIOCHEMISTRY
(Semester 1 -2011/12)
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Learning outcome (Objectives)● Function and distribution.
● Characteristics of fatty acids-structure and chemical properties.
● Saturated and unsaturated fatty acids .
● Structures and properties of phospholipids, sphingolipids, waxes, terpenes and steroids.
LIPID
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???????
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DEFINITION : General definition – all compounds called fat and oils
TECHNICAL DEFINITION
Fat : Triglycerides in the form of solids at room temperature
Oils : Triglycerides which are liquid at room temperature
LIPID
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Any natural compound which is insoluble or nearly insoluble in water but soluble in non-polar solvents –
a. Chloroform
b. CS2
c. Ether
d. warm or
e. hot ethanol
General Definition
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i. Structural functions - Components of membranes
ii. Storage forms of carbon and energy
iii. precursor for major compounds – e.g. hormones.
iv. Insulators - thermal, electrical or physical shock
v. protective coatings – prevent infections, loss or addition of compounds
vi. Regulators - as vitamins & hormones
FUNCTIONSLipids are widely distributed in both animal and plant systems and perform a wide variety of functions
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1. SIMPLE LIPIDS
Fatty acid esters(Acid + alcohol ester)
2. COMPPOUND LIPID
Fatty acid + alcohol + OTHER COMPOUNDS
CLASSIFICATION
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LIPID COMPONENTS
Acyglycerols (Glycerol + Fatty acids) =
Waxes Alcohol + fatty acids
SIMPLE LIPIDS
Esters
???
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4 types of Compound lipid
i. Phosphoglycerides
ii. Sphingolipids
iii. Cerebrosides
iv. Gangliosides
COMPOUND LIPIDS
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LIPID COMPONENTS
i PhosphoglyceridesGlycerol + Fatty acid +HPO4
2- + satu OHR
ii Sphingolipids Sphingosine + Fatty acid + HPO4
2- + Choline
iii Cerebrosides Sphingosine +Fatty acid + Simple sugar
iv GangliosidesSphingosine + Fatty acid+ 2-6 Simple sugar (Including sialic acid)
COMPOUND LIPID
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i & ii = Phospholipid - presence of phosphate
ii , iii & iv = Sphingolipids - presence of Sphingosine
iii & iv = glycolipid - presence of carbohydrate
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GLYCEROL – Trihydroxy alcohol
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● Long chain aliphatic carboxylic acids- contains carboxyl group – polar head and `tail’ containing hydrocarbon chain
● Amphiphilic compounds – hydrophilic head and hydrophobic tail
● COOH can be ionised
● Monocarboxyilic acids – linear hydrocarbon chain, even carbon numbers – between C12-C20
● Short, longer , branched, cyclic and odd numbers also exist BUT not many
FATTY ACIDS
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Octadenic acid
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2 TYPES
1. Saturated Fatty acids
2. Unsaturated Fatty acids
FATTY ACIDS
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Fats ● mostly from animal sources,
● have all single bonds between the carbons in their fatty acid tails, thus all the carbons are also bonded to the maximum number of hydrogens possible.
● saturated fats
● The hydrocarbon chains in these fatty acids are, thus, fairly straight and can pack closely together, making these fats solid at room temperature.
Structure of Fatty Acids - Saturated
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Saturated fatty acid –e.g.
1. palmitic acid (CH3(CH2)14COOH) (16C) &
2. Stearic acid (CH3(CH2)16COOH)
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Saturated Fatty Acids
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● Unsaturation normally at - C18 & C20 – double bond separated by methylene group
-CH = CH - CH2 - CH = CH
● Double bonds = cis configuration
● Unsaturated fatty acid - oleic (18:1), Linoleic (18:2), Linolenic (18:3) & arachidonic (18:4)
Structure of Fatty Acids - Unsaturated
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● C=C double bond arranged in two ways
● In cis bonds, the two pieces of the carbon chain on either side of the double bond are either both “up” or both “down,” such that both are on the same side of the molecule
● In trans bonds, the two pieces of the molecule are on opposite sides of the double bond, that is, one “up” and one “down” across from each other
● Naturally-occurring unsaturated vegetable oils have almost all cis bonds, but using oil for frying causes some of the cis bonds to convert to trans bonds
Unsaturated fatty acids
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TRANS CIS
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Unsaturated Fatty Acids
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● fatty acids with trans bonds are carcinogenic, or cancer-causing.
● containing products such as margarine are quite high,
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● mostly from plant sources,
● have some double bonds between some of the carbons in the hydrocarbon tail, causing bends or “kinks” in the shape of the molecules.
● Because some of the carbons share double bonds, they’re not bonded to as many hydrogens
● oils are called unsaturated fats.
● kinks unsaturated fats can’t pack as closely together, making them liquid at room temperature
Oils
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CIS TRANS
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● Vegetable oils often contain high proportions of polyunsaturated and mono-unsaturated fats (oils) liquids at room temperature.
● You can "harden" (raise the melting point of) the oil by hydrogenating it in the presence of a nickel catalyst.
Making margarine
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2 GROUPS
i. Neutral acyglycerols (e.g. Triacylglycerol)
ii. Waxes
Acyglycerols
= glyceride = a tryhydroxy alcohol ester
= glycerol + fatty acid (3 different fatty acids)
= can be esterified
SIMPLE LIPIDS
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Glycerol = trihydroxy
alcohol
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TRIACYGLYCEROLS
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● Triacylglycerol – the most abundant
● No ionic groups - neutral lipids
● Triacylglycerol = neutral fats (solids) @ neutral oils (liquid)
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I. Adipose tissues - `fat depots' = storage forms of carbon and energy
II. Transport - chylomicrons - = lipoprotein – fatty acids are transported through lymphatic system and blood tissue adipose tissues and other organs
III. `Physical protection' - e.g. temperature.
FUNCTIONS IN ANIMALS
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● Also an ester - alcohol & fatty acid = very long hydrocarbon chain – commercial application
● hairs, skin, leaves, fruits
WAXES
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Asid Oleic
WAXES
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1. Hydrogenation
CHEMICAL CHARACTERISTICS OF TRYACYLGLYCEROL (Reactions of Triacylglycerol)
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Double bonds in vegetable oils can be
hydrogenated oils become solids – can
control - e.g.. peanut butter - crunchy,
creamy
HYDROGENATION PROCESS
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Other halides - Iodine(I2), Chlorides (Cl2)
2. Halogenation – Addition of halogens
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● Saturated fatty acid – iodine number = 0● Oleic acid - 90, ● linoleic- 181,● Linolenic = 274
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● Animal fat-iodine number is low
● Vegetable oils – iodine number is high
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(i.) Base Hydrolysis Fatty acid + Glycerol or Salts of fatty acid + Glycerol
● inside cells – by enzymes (lipase) – very specific for ester bonds – products are glycerol + fatty acids
● Non-enzymatic- with alkali (base) salts of fatty acid + Glycerol
● salts of fatty acids = soap
Base Hydrolysis = SAPONIFICATION
3. Hydrolysis
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● The reaction of triacylglycerol with base (alkali) - e.g.. NaOH, KOH
● Triacylglycerol – presence of strong ester bond
● Ester bond can be hydrolyzed by base salts of fatty acid + glycerol
Salts = soap – react as a soap/detergent
SAPONIFICATION
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Saponification reaction(Base Hydrolysis)
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If R= palmitic acid Sodium palmitate
If R’= oleic acid Sodium oleate
R”= stearic acid Sodium stearate
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Detergent? =`surface active agents' – lower surface tension of surface of water
H2O = `poor cleansing agent - Y? Because the molecule is very polar and tend to stick to each other – therefore cannot enter non-polar areas like grease, oil, dirt
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i. Hydrophobic tails enters grease layers
ii. Hydrophilic heads come into contact with aqueous layer separate grease layer from the surface
iii. Small grease globules form- `pincushion‘
iv. These globules have similar charges - therefore cannot go near each other – can wash
HOW DOES A DETERGENT WORK ??
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Grease
Water
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Head -Polar
(hidrofilik)
Ekor-Tak polar(Hidrofobi
k)
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Carboxylic acids
(ii). Acid Hydrolysis
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Expose triacylglycerol to warm and moist air rancid (tengik)
2 reactions take place
1. Ester hydrolysis
2. Oxidation of the double bonds
● Hydrolysis - water (inside the lipid) + enzyme (bacteria in the air)
● Oxidation-by O2 on the side chain of triacylglycerol short chain fatty acids – rancid (tengik)
4. RANCIDITY
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Phosphoglycerides = Phosphoglyceroli.e. they are derived from glycerol
Fatty acids
Phosphate group
Glycerol
Phosphoglycerides
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Phosphoglycerol = Phosphoglyceride
Glycerol @ other alcohols
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Glycerol (Trihydroxyglycero
l)
Phosphatidic acid
(Glycerol + 2 fatty acids + Phosphate)
Phosphoglyceride (Phosphoglycerol) (Glycerol + 2 fatty acids + Phosphate + other
group e.g.. alcohol)
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All phosphoglycerides are
Phospholipids!!!!
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Phosphoglycerides can be further esterified to form other lipids
i. Phosphatidylcholine ( choline ester)
ii. Phosphatidylethanolamine (ethanolamine)
iii. Phosphatidylserine (serine)
All are important components of membranes
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Asid lemak
Phosphate
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Phosphatidylethanolamine
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Phosphatidylethanolamine
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Phosphatidylserine
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Membrane
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● No glycerol – replaced with amine alcohol = Sphingosine
● Number of carbon atoms –varies
● The simplest = ceramides = Fatty acid + sphingosine through amino group via amide bond
● Sphingomyelin – an example of sphingolipid - 1o alcohol esterified to phosphate
amino alcohol (= choline)
Found in nerve membranes and brain
SPHINGOLIPID
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CHCH(CH2)12CH3
CHOH CH NH2
CH2OH
H2C OH H2COH H2C OH
Sphingosine Glycerol
SPHINGOLIPID
1. What is the main structure for sphingolipid?Sphingosine
2. Draw the structure of sphingosine
3. Draw the structure of glycerol and compare between the two
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● No glycerol – replaced with amine alcohol = Sphingosine
● Number of carbon atoms –varies ● The simplest = ceramides = Fatty acid + sphingosine
through amino group via amide bond ● Sphingomyelin – an example of sphingolipid - 1o
alcohol esterified to phosphate amino alcohol (= choline)
Found in nerve membranes and brain
SPHINGOLIPID
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CERAMIDE
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Phosphate
Choline
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● When a carbohydrate is attached to OH- via glycosidic bond
● Seb. induk = ceramide (sphingolipid) + CHO
● Cerebroside - CHO = glucose @ galactose
● glucocerebroside
● GANGLIOSIDE – ALSO contains oligosaccharide + sialic acid
GLYCOLIPID
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● A heterogeneous group ● Derived from fatty acids ● steroids, prostaglandin, leukotriene, carotenoids,
vitamin
STEROID
All organisms – similar basic structure – fused ring=
perhydrocylopentanophenanthrene
DERIVED LIPIDS
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i. Hydrocarbon chain (C18-C20) at C17
ii. Hydroxyl group (OH) at C3
● Main example = CHOLESTEROL – structural component of membrane - 0 -40% lipid membrane. Rigid
● Precursor of bile, sex hormones, vit. D.
● Role in atherosclerosis
STEROL
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Hydrocarbon chain at C17
OH at C3
CHOLESTEROL
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● Lipid derived from isoprene
● Term used for all compounds synthesized from the precursor isoprene cholesterol, bile acid, steroid, lipid soluble vitamins = terpene
● Oils from turpentine (pine tree extracts)
● formula C10H15
● > 15 carbon atom also found - `multiples of 5
● Also in other plants
TERPENE
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Terpene with 20 carbon atoms - vit. A - 40 carbon atoms - b- carotene
EXAMPLES:
1. monoterpene - Limonene - `odor' lemon
2. Diterpene - Gibberrelic acid – plant hormone
3. Triterpene - Squalene – Cholesterol precursor
4. Tetraterpene - Lycopene - tomato pigments
TERPENE
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TERPENE
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TERPENE
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TERPENE
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BCM 3000PRINCIPLES OF BIOCHEMISTRY
(Semester 1 -2011/12)
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● Lipid – not soluble in water but can still be found in aqueous environment
● behavior in water important to understand the phenomena
● A lot of lipids are amphiphyllic = having
hydrophobic part (hydrocarbon chain)
polar (ionic) part
LIPID BEHAVIOUR IN WATER
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When lipid is dispersed in water, the hydrophobic part will segregate from the solvent through `self-aggregation' – form
a. micelles – which are dispersed in water b. monolayers ( aggregate – boundary
H2O: air
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MONOLAYERMICELLES
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The tendency for hydrocarbon chains to distance away from polar solvents gives rise to = HYDROPHOBIC EFFECT
● Most lipids will form micelles – spheres, ellipse, discs, cylinders
● Also can form vesicles – bilayer – hydrocarbon chains are opposite to each other `hollow sphere'
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Micelle
BilayerVesicles
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BILAYER
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Cholesterol does not form micelles ??
Not amphiphatic compounds
Structure – flat fused ring - solid –difficult to form micelles
Can form mixed micelle with amphiphatic lipids mixed micelles – with amphiphatic lipids
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Bile acids serve many functions.
● They aid in fat absorption
● Bile acids are produced from cholesterol in the liver.
● Cholesterol is converted to the carboxylic acids cholic and chenodeoxycholic acid, which are the primary bile acids in most species.
● The liver conjugates the acids to either glycine or taurine and subsequently secrets them into the bile.
● The gall bladder serves to store bile acids until contraction associated with feeding
BILE ACID AND BILE SALTS
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Glycine Taurine
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Particles that contain lipid and protein
bonds = not (non-covalent) bonds
Function – In blood plasma – to transport triacylglycerol and cholesterol
STRUCTURE - form `micelle like particles' -
i. core – non-polar triacylglycerol
ii. Surrounded by a layer of amphiphilic protein, phospholipid and cholesterol
LIPOPROTEIN
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Various categories – depending on the functions
i. CHYLOMICRON – Carries exogenous triacylglycerols & cholesterol (from diet) from intestine to the tissues.
ii. LDL, IDL & LDL – group of related particles which carry endogenous triacylglycerols & cholesterol (produced internally) from the liver to tissues
NB: liver can synthesize triacylglycerol from excess carbohydrate
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Cholesterol –
● Important component of membrane – can be supplied from the outside or internally (if not enough)
● How obtained externally ? – ENDOCYTOSIS – Through reaction of specific receptors = LDL receptor?
● protein part of LDL tie up to R-LDL in the cell complex `pinched off' = endocytosis
LDL, CHOLESTEROL & ATHEROSCLEROSIS
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ENDOCYTOSIS vs EXOCYTOSIS
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Protein – recycled – used in the cell Oversupply ? –
Synthesis of R-LDL inhibited low LDL cholesterol level in blood increases deposited in the artery heart disease; stroke
HDL Function opposite of LDL
Carries cholesterol from tissues - extract cholesterol from membrane – change to `cholesteryl esters - LCAT (Lecithin cholesterol transferase) bile acids