There is another melanocyte-stimulating hormone called B-melanotropin. Cleavage of 3-melanotropin with trypsin produces the following peptides plus free aspartic acid. WGSPPK, DSGPYK, MEHFR Part A If you assume maximum sequence similarity between a-melanotropin and 3-melanotropin, then what must the sequence of the latter be? (a -melanotropin: Ser- Tyr- Ser-Met- Glu- His- Phe- Arg- Trp- Gly- Lys- Pro- Val) Drag the appropriate labels to their respective targets so that the maximum sequence similarity to the order of a-melanotropin will be shown. MEHFR WGSPPK DSGPYK Reset Help
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- There is another melanocyte-stimulating hormone called β-melanotropin.Cleavage of β-melanotropin with trypsin produces the following peptidesplus free aspartic acid. WGSPPK DSGPYK MEHFRIf you assume maximum sequence similarity between α-melanotropin andβ-melanotropin, then what must the sequence of the latter be?The following amino acids that are often found inside globulin molecules are () A, Tyr B, Phe C, Asn D, Glu True of false 1. In the de novo synthesis of purine nucleotides and pyrimidine nucleotides, base rings are first synthesized and then corresponding nucleotides are formed with phosphoribose. () 2. Transcription is the process of transferring genetic information from DNA to RNA. DNA is synthesized under the catalysis of RNA polymerase, and the direction of synthesis is from the 5 'end to the 3' end. () 3. The change of protein conformation is caused by the breaking of covalent bonds within the molecule. () 4. In very high and very low pH solutions, amino acids exist mainly in non-ionic form. () 5. The active center of an enzyme usually consists of several amino acid residues adjacent to each other in the primary structure. ()A peptide with the primary structure Lys-Arg-Pro-Leu-Ile-Asp-Gly-Ala must be synthesized by the methods developed by Merrifield. Calculate the percentage of the peptides synthesized that will be full length and have the correct sequence if the addition of each amino acid residue is 96% efficient. Do the calculation a second time but assume a 99% efficiency for each cycle. full-length peptides with the correct sequence if 96% efficient: full-length peptides with the correct sequence if 99% efficient: % %
- Consider the peptide Asp-Lys-Phe-Glu-Asn-Tyr-Gln-Val-Cys. In a single beaker, you treat this peptide with 2 proteases. One protease cleaves at the N-terminus of aromatic R groups and the other cleaves at the C-terminus of polar, non-ionizable R groups. Following the enzymatic digestion, you want to separate your peptide fragments so that you can identify them. You choose to separate the fragments using an anion exchange column. Beginning at pH=6 you apply your peptide fragments to the column and you gradually decrease the pH of the column stopping the separation when the pH of the column equals 4. Omitting chemical structures, write the amino acid sequence of the peptide fragments that are produced from this digest. Write the order that these fragments will elute from the column (if at all). (Relevant pKa values are: 2.1, 3.8, 4.3, 8.3, 9.6, 10.1, and 10.5)Draw a peptide for cys-asn- pro-gly (Using the same format in picture)Two melanocyte-stimulating hormones have the following amino acid sequences. Take a highlighter or colored pencil, and figure out how much of the sequence the porcine MSH has in common with the human MSH (how much is conserved between the two species). beta-MSH (human): Ala-Glu-Lys-Lys-Asp-Glu-Gly-Pro-Tyr-Arg-Met-Glu-His-Phe-Arg-Trp-Gly-Ser-Pro-Pro-Lys-Asp beta-MSH (porcine): Asp-Glu-Gly-Pro-Tyr-Lys-Met-Glu-His-Phe-Arg-Trp-Gly-Ser-Pro-Pro-Lys-Asp One amino acid interrupts the parts you highlighted in each sequence. Which amino acid was it in each and which category does that amino acid belong to on your amino acid chart? this to make much difference for the cross-species function of beta-MSH (why?)? and Do you expect
- Met-enkephalin (Tyr–Gly–Gly–Phe–Met) is a painkiller and sedative (Section 21.5). What is a possible nucleotide sequence in the template strand of the gene that codes for met-enkephalin, assuming that every base of the gene is transcribed and then translated?Shown to the right is a cartoon image of ETC Complex I from Y. lipolytica. A group of authors studied this wild type Complex I and also a version where the arginine at position 121 in the chain 3 subunit was mutated to a methionine (R121M). Part of chain 3 subunit contains the peptide sequence SMITH a. Draw the titration curve for the SMITH peptide. Mark all pKa’s and the pI on your curve. For the SMITH peptide at physiological pH, explain what types of interactions you believe the side chains are or are not able to participate in.A tridecapeptide yields the following fragments when partially hydrolized. Determine the sequence of amino acids in the tridecapeptidedrolyzed. Determine the sequence of the tri decapeptide. tridecapeptide à lys-arg + gly-phe-pro + phe-ser-asp-lys + pro-phe-ser + asp-lys-arg-val + gln-ala-tyr + val-trp-gln. Determine the sequence of amino acids in the tridecapeptide
- Given the peptide Val-Ser-Gln-Lys The lateral chain of one of these amino acids can be modified by N-acetylation. Write the semi‐developed form of the lateral chain of this modified amino acid at pH 7 The lateral chain of one of these amino acids can be modified by phosphorylation. Write the semi‐developed form of the lateral chain of this modified amino acid at pH 7.What is the length in AA’s of the LilP protein? Assume fMet is NOT CLEAVED. Write out the sequence of the polypeptide in AA: use the three letter notation, e.g. Met-Ser-Pro-What are the sequences of all the possibletripeptides that contain the amino acids aspartic acid, leucine, andphenylalanine? Use the three-letter abbreviations to express youranswer.