Metalloproteases can contain a catalytic triad made up of: D(H₂O)D E(Ln*)S
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- Dehalogenase enzymes catalyze the clevage of C-X bonds. One such dehalogenase catalyzes the following reaction. An active site aspartate is thought to carry out the initial nucleophilic attack that expels the chloride. Select the most likely intermediate in the reaction. (Note the stereochemistry. Refer to P11.19 in the textbook if needed.) O O A C D OE -CH₂ H H₂C™ CO₂ H B CO₂ CI N H₂O Cr CO₂ H CO₂ нотум CH3 D CO₂ five N E CH₂b) Why might the compound shown below act as a transition state analog of phosphoglucose isomerase? A drawing of the normal transition state for this enzyme is needed. HO- OH T .N -OH -OH CH₂OPO₂²-The biosynthesis of vitamin D₂ is a two-step reaction, requiring two types of concerted pericyclic reactions. Draw in the arrows for each step and identify the structure of precalciferol. If an electrocyclic reaction is required, identify if it occurs through a conrotatory or disrotatory reaction. HO H H ergosterol hv precalciferol Cast HO ergocalciferol
- A simple enzymatic reaction proceeds as follows. E+S↔E.S→ E+P Derive the Michaelis–Menten equation for this reaction.4- Salicylamides are inhibitors for an enzyme called scytalone dehydratase. SAR shows that there are three important hydrogen bonding interactions. Explain whether you think quinazolines could act as a bioisostere for salicylamides. HBA OH O 00 N NHR Quinazolines Salicylamides Ph HBA 5- Structure IX (X = NH) is an inhibitor of a metalloenzyme called thermolysin and forms interactions as shown. Explain why the analogue (X = O) has reduced binding affinity by a factor of 1000 and why the analogue (X = SH) has roughly the same binding affinity. Structure IX H HBD Ala-113 R(i) During the Pyruvate Decarboxylase (PDC) catalysed reaction, a covalent coenzyme intermediate is formed. On the skeleton of the covalent coenzyme intermediate below draw the appropriate double bonds, charges, and electron pairs to illustrate the two resonance forms of this intermediate. Name each form in the boxes provided. HO S R' N -R HO S R' N -R
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- Briefly discuss the Glyoxylate Pathway Note: Please include a diagram if any, then please dont forget to include your references, Thank youuu1. (a) write, using structural formulas, the sequence of TCA cycle intermediates. Indicate the position of the 14C atom in each intermediate. Do not name enzymes or cofactors catalyzing the reactions. Starting with citrate formed immediately after reaction of [2-14C]acetyl-SCOA with OAA,Give a complete and well descriptive definition of the following:1.1 Enzyme catalysis1.2 Co-enzyme1.3 Negative heterotropic co-cooperativit