Dr. Nafith Abu Tarboush
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1 8 Dr. Nafith Abu Tarboush June 30 th 2013 Ahmad Ayyat
2 Nucleic Acids: Molecules that carries information for growth and production of cells, and they are Polymers of "Nucleotides" (the monomers).01 Nucleotide consists of: 1)N-Base 2)Pentose Sugar 3)Phosphate Group Nucleic Acids: DNA or RNA RNA: Everywhere in the Cell DNA: In nucleus (mainly), mitochondria and chloroplasts in plants. The bond between N-Base & Sugar: It is Glycosidic bond of (β) type. remember how to Indicate (β) or (α) It is between the anomeric Carbon (in sugar) & N-Base *What are the "Nucleosides"?? NUCLEOSIDE= NEOCLUTIDE-PHOSPHATE GROUP So nucleoside is a nucleotide WITHOUT phosphate group *How can I name a nucleoside?? -For Purines ((Adenine & Guanine)): we add "-osine" "Adenosine" -For Pyrimidines ((Cytosine, Thymine and Uracil)): we add "-idine" "Thymidine"
3 *How can I name a nucleotide?? -Name it as nucleoside then add (mono, di or tri phosphate) "Adenosine triphophate" -Or we add "-ylate" instead of "mono Phosphate" The Bond between 2 nucleotides: it is Phospho diester bond Structures of Purines and Pyrimidines: (we should be familiar with them) -There are some bases "non-coding" bases: -These bases are related to Purines and Pyrimidines. -These N-Bases may be related to genetic coding and sometimes not related. *These bases may be produced by methylation of N-Bases. Like: Cytosine 5-methylcytosine *Methylation of nucleotides in DNA plays a role in regulation of DNA replication. *Sometimes these nucleotides are linked to trna. These three Nucleotides are intermediate in Purine metabolism
4 * Uric acid concentration Increasing due to a problem in the pathway of Purine metabolism and this may lead to Capillary clotting (especially in joints near big toe and hands. *Other examples: In Addition to: N4methylcytosine ((cytidine)) Caffeine (1,3,7trimethylxanthine): *Why Caffeine makes us awake?? due to its structure (similar to adenosine).that binds to its neural receptors to promote sleeping.so Caffeine works as Inhibitor for these receptors.
5 *ATP Adenosine triphosphate *ADP Adenosine diphosphate *AMP Adenosine monophosphate Properties of Pyrimidines & Purines Remember: When PH reaches pka of a substance, then this substance will dissociate (H) so if pka was above PH it will not dissociate the proton and if pka was below PH so it is surely dissociated. *The Keto (lactam) form is more common due to its pka pka is high so it will control the association of (H).(PH in body is around 7)
6 -So: this keto form is important because it helps in control the association of (H) in the double helix structure of DNA. (Control hydrogen bonding in base paring) because each nucleotide has a specific pka value at one of its Nitrogens *This absorbance helps us to detect what is the Nucleotide and its quantity. For( U) & (A ): the peak is around 260 nm. For (C): the peak is around 280 nm. For (G): the peak is around 255 nm. *So we can detect what is the nucleotide then we can use factors to get the concentration of that nucleotide. convert absorbance to concentration.
7 Pentoses in Nucleotides *How to differentiate between Carbon in N-Base & that in the sugar?? (') is for the carbon in CHO not N-Base
8 Functions of nucleotides -When phosphate is connected to carbon (3) Cyclic form of nucleotides like:camp and cgmp as second messenger Polymerization
9 *So we must have free 5' at beginning and free 3' at the end *Phosphate pka is 0 always acidic regardless the value of ph (dissociated). Classes of nucleic acids:.
10 *E.coli is a reference in bacterial cells. *DNA is circular in eukaryotes. *N-Base is the different in nucleotides. *Side chain is the N-Base and the sugar with phosphate group is the back bone. *hydrogen bonding is weak but number of H-bonding is high stability *DNA structure has flexibility due to rotations around bonds in the nucleotides. *purines form hydrogen bonds to pyrimidines, with adenine bonding only to thymine in two hydrogen bonds, and cytosine bonding only to guanine in three hydrogen bonds ( in DNA). DNA Primary Structure ((Here: Numbers, types and sequence of nucleotides is important))
11 DNA secondary structure: *this grooving makes it soluble in water. Please check slide 21* Classes Of DNA
12 B-DNA is the form that we know (in nucleus) A-DNA is thicker than B-DNA. *in double helix..bases on top of each other are very nearly and there is hydrophobic interactions between them and base paring (hydrogen bonding) in this case are not in their perfect binding manner due to base stacking.and this called "Propeller-twist". *base pairing: N bases are opposite to each other. *base staking : N bases are above each other.
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