Calculating the molecular weight and subunit organization of a protein from its metal content the element molybdenum (atomic weight 95.95) constitutes 0.08% of the weight of nitrate reductase. If the molecular weight of nitrate reductase is 240,000, what is its likely quaternary structure?
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- Chorismate mutase is an enzyme that promotes a pericyclic reaction by forcing the substrate to assume the conformation needed for the reaction. The product of the pericyclic reaction is prephenate that is subsequently converted into the amino acids phenylalanine and tyrosine. What kind of a pericyclic reaction does chorismate mutase catalyze?Draw the structure of the peptide ENDQCW. Draw the stereochemistry of the amino acids. Show the ionization state that would be the major form at pH 1. What is the isoelectric point of the peptide?If you had a protein X, which is a soluble enzyme found inside the peroxisome, and you wished to separate it from a similar protein Y, which is an enzyme found embedded in the mitochondrial membrane, what would be your initial techniques for isolating these proteins?
- One of the levels of proteins is called tertiary. Name and define two of the categories for tertiary BESIDES hydrogen bonds.The following compound is an intermediate in the biosynthesis of one of the 20 common -amino acids. Which one is it likely to be, and what kind of chemical change must take place to complete the biosynthesis?Which of these structure represents cysteine at pH=13
- Illustrate a glycosidic, peptide and a phospho-diester bond.Which folate structure (from the list below) (a) is the substrate for the enzyme that is inhibited by methotrexate and trimethoprim? (b) has the most highly oxidized one-carbon substituent? (c) is used in the conversion of serine to glycine? (d) transfers its one-carbon substituent to a B12 coenzyme? What amino acid is synthesized as the end result of this reaction? (e) is the coenzyme for the thymidylate synthase reaction? (f) is not known to exist in nature? (g) is used in purine nucleotide synthesis?1. Taking the structure of the amino acids into account, give a comparative discussion pK values where histidine=2 and alanine=2.
- Which of the following is/are TRUE regarding the addition of silver ion to albumin? Refer to the reaction mechanism below. It is a displacement reaction formation of complex denatured metalloprotein salt hydrogen bond breaking deprotonation of protein occurs all of the following are true.Please answer true or false and give a short explanation. Thank you - The coferent of aminotransferases is FAD. - Is phenylalanine a precursor to serotonin?99. The _____________ plot shows the free energy change for a given amino acid window, allowing the prediction of transmembrane helices.