Podcast
Questions and Answers
What role does N5N10-methylene tetrahydrofolate play in the synthesis of thymidine monophosphate (TMP) from deoxyuridine monophosphate (dUMP)?
What role does N5N10-methylene tetrahydrofolate play in the synthesis of thymidine monophosphate (TMP) from deoxyuridine monophosphate (dUMP)?
- It provides the necessary phosphate group for the conversion of dUMP to TMP.
- It inhibits the thymidylate synthase enzyme if TMP levels are too high.
- It acts as a direct catalyst, accelerating the reaction without being consumed.
- It serves as a co-enzyme, donating a methyl group to dUMP to form TMP. (correct)
Orotate phosphoribosyltransferase facilitates which of the following biochemical conversions?
Orotate phosphoribosyltransferase facilitates which of the following biochemical conversions?
- Uridine monophosphate to uridine diphosphate.
- Uridine diphosphate to uridine triphosphate.
- Orotidine monophosphate to orotic acid.
- Orotic acid to orotidine monophosphate. (correct)
Which enzyme directly catalyzes the conversion of orotidine monophosphate (OMP) to uridine monophosphate (UMP)?
Which enzyme directly catalyzes the conversion of orotidine monophosphate (OMP) to uridine monophosphate (UMP)?
- Orotidylate decarboxylase (correct)
- Thymidylate synthase
- Ribonucleotide reductase
- Orotate phosphoribosyltransferase
In the synthesis of cytidine triphosphate (CTP), what two molecules are directly involved in the reaction catalyzed by CTP synthetase?
In the synthesis of cytidine triphosphate (CTP), what two molecules are directly involved in the reaction catalyzed by CTP synthetase?
What enzymatic activity is associated with dihydroorotase?
What enzymatic activity is associated with dihydroorotase?
In the context of nucleotide synthesis, what is the role of ribonucleotide reductase?
In the context of nucleotide synthesis, what is the role of ribonucleotide reductase?
Why is compartmentalization important for carbamoyl phosphate synthetase II in pyrimidine synthesis, compared to carbamoyl phosphate synthetase I in the urea cycle?
Why is compartmentalization important for carbamoyl phosphate synthetase II in pyrimidine synthesis, compared to carbamoyl phosphate synthetase I in the urea cycle?
What is the immediate source of reducing power for ribonucleotide reductase?
What is the immediate source of reducing power for ribonucleotide reductase?
What distinguishes the role of PRPP (phosphoribosyl pyrophosphate) in pyrimidine biosynthesis from its role in purine biosynthesis?
What distinguishes the role of PRPP (phosphoribosyl pyrophosphate) in pyrimidine biosynthesis from its role in purine biosynthesis?
Which enzyme catalyzes the initial committed step in pyrimidine biosynthesis?
Which enzyme catalyzes the initial committed step in pyrimidine biosynthesis?
Flashcards
dTMP Synthesis
dTMP Synthesis
Conversion of dUMP to dTMP, catalyzed by thymidylate synthase, requires N5N10-methylene tetrahydrofolate as a co-enzyme.
dUDP to dUMP
dUDP to dUMP
dUDP is converted to dUMP through the removal of water, facilitated by an enzymatic reaction.
UMP to UDP
UMP to UDP
UMP is converted to UDP by kinase enzymes, utilizing ATP.
CTP Synthesis Requirements
CTP Synthesis Requirements
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Deoxyribonucleotide Synthesis
Deoxyribonucleotide Synthesis
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Pyrimidine Synthesis Start
Pyrimidine Synthesis Start
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Carbamoyl Aspartate Formation
Carbamoyl Aspartate Formation
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Ring Formation
Ring Formation
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Orotate Synthesis
Orotate Synthesis
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Orotidine Monophosphate
Orotidine Monophosphate
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Study Notes
- dUMP converts to dUMP through water removal.
Synthesis of TMP from dUMP
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N5N10 methylene tetrahydrofolate is the co-enzyme.
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Thymidylate synthase helps dUMP convert to TMP.
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OMP converts to UMP via orotidylate decarboxylase.
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UMP phosphorylation to UDP is facilitated by the enzyme kinase.
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UDP phosphorylation forms UTP.
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CTP requires ATP and glutamine as molecules
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CTP is also formed by the enzyme CTP synthetase
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UDP is necessary to synthesize TMP
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UAP converts to by the enzyme ribonucleotide reductase
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NADPH is the co-enzyme
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Ribonucleoside diphosphate reduces to deoxyribonucleoside diphosphate.
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The reduction of two hydroxyl Phostinpurinn and Pyrimidine are catalyzed by complex gigantic enzymes
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Ribonucleotide reductase offers deoxyribonucleoside diphosphate for synthesis and DNA repair.
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Enzyme Complex 15 functions when cells are synthesizing DNA
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Reduction demands reduced Thioredoxin, Thioredoxin inductarse and MADPH
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Immediate reduction is produced by MARPH dependent reduction of oxidized thioredoxin
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Fibonulleoside diphosphate to deoxyribonucleoside diphosphate is Substratied to Complex Regulatory Control
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It achieves production of leaxyribonucleoside diphosphate for DNA synthesis
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Dihydroorotic acid converts to orotic acid using dihydro orotate dehydrogenase.
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Orotic acid converts to orotidine monophosphate
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Orotate phosphoribosyl transferase and PRPP are required for the process
Biosynthesis of Pyrimidine
- Initial reaction catalyst in pyrimidine nucleotide biosynthesis is Cabo Grasolic
- Carbomyl phosphate Synthase 2 is different from Carbamide Synthase I of Urea
- Compartmentalization provides an independent pool of carbonyl phosphate of sach proceed.
- PRPP serves as a scaffold in purine biosynthesis and participates in pyrimidine biosynthesis.
- Pyrimidine biosynthesis is energetically costly
- Carbonyl Phosphate production involves CO2, glutamine, and ATP
- Carbonyl phosphate Synthase 2 catalyzes the reaction.
- Carbonyl phosphate and aspatate sulphate creates Carbonyl aspabe acid
- Aspatate transCarbonylase catalyzation enables the reaction
- Carbony aspartic acid converts to dihydro-orobic acid through the emzyme dihydro orolase
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Description
dUMP converts to TMP via water removal, with N5N10 methylene tetrahydrofolate as the co-enzyme. Thymidylate synthase facilitates this conversion. Other processes such as OMP to UMP, UMP phosphorylation to UDP, and UDP phosphorylation to UTP also occur. CTP requires ATP and glutamine.