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Coenzymes

Vitamin B derivatives and metalloenzymes

QuestionAnswer
B1(thiamine) Modified Vitamin: TPP(thiamine pyrophosphate) Modification: Adding pyrophosphate catalytic group: Thiamine ring binding group: Pyrophosphate in the active site usually via Mg+2 Rxn: decarboxylation
B7 (Biotin) Modified Vitamin: biocytin Modification: Binding to Lys catalytic group: N in biotin ring binding group: Amino group of lys covalently Bound to biotin Rxn: carboxylation
B5 (pantothenate) Modified Vitamin: Coenzyme A=adenine, diphosphates, Ribose(adenosine 3,5 bisphosphate), Pantothenate And modified Cys Modification: modified cystine catalytic group: Thiosulfate binding group: Adonisine3, 5 bisphosphate Rxn: Carrying acyl
B6 (pyridoxine) Modified Vitamin: PLP (pyridoxal phosphate) Modification: Oxidation (giving aldehyde) Then adding phosphate catalytic group: Carbonyl group binding group: Phosphate group Rxn: transaminase
B3 (Nicotinic acid) Modified Vitamin: NAD+ NADP+ Modification: Nicotinic ring(niacin), Dinucleotides *it receives 2 e- as a hydride anion catalytic group: Nicotinic ring binding group: ADP and everything else except nicotinic ring Rxn: redox
B2 (Riboflavin) Modified Vitamin: FAD(flavin adenine dinucleotide), FMN (flavin mononucleotide) For regulation Modification: It consists of flavin ring, having 2 recipient N (N1,5) Each receives one e- catalytic group: flavin binding group: ADP Rxn: redox
Zn+2 carbonic anhydrase carboxypeptidase
Mg+2 Hexokinase
Se Glutathione peroxidase
Mn+2 superoxide dismutase
Created by: 3366755700318523
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