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- I. A protein, X, was Isolated from a pathogenlc mlcroorganism. The proteln Is a vlrulence factor whose path0genlclty lies In a heptapeptide of unknown sequence. After trypsin cleavage of the heptapeptide from protein X, the peptlde's compOsition and sequence was determined. The fOllowing were the results of the sequenclng process: 1. When the peptide was treated with dinitrofluorobenzene (DNFB), DNP-asp and a mixture of amino acids were produced. 2. When the same Intact peptide was treated with streptococcal protease, a pentapeptide of composition asp, asN, cys, gly and ser and 2 amlno acids were released. 3. When the heptapeptlde was also treated with hydrOxylamine HCI, a tripeptide and a tetrapeptide were obtained. The C-terminal amino acid of the tripeptide was asN. 1) What is the sequence of the heptapeptide if it is composed of cys, asp, lys, asN, gly and ser only? 2) What is the pl of the heptapeptide?1. Thennoglobin is made ap of tour polypeptides, but also requis a hane group consony nap reptes puo ednart susy sis que le desNAZO NHZ Ala-Cys-Glu -Tyr - Trp - Lys - Arg - His -Pro-G ly Glu pka 4.15 SH Tyr 10.10 Draw Charges Lys 10.67 Olt A3 12.10 +NH₂ Ntrm 2) Calculate net charge 3) write out I letter code 300 Ctim 3 juli of peptich (above) Ⓒ pH; 1,7,12
- Pathogenic E. coil have recently been shown to degrade tight junction proteins during infection. How would this provide an advantage to the bacteria?The main function of a DNA molecule is to ________ . a. store heritable information b. carry a translatable message c. form peptide bonds between amino acids.10. (a) Provide the scheme of Merrifield peptide synthesis with suitable example. (b) Describe the mechanism of action of the enzyme lysozyme.
- The peptlde bradykinln is a nonapeptlde. Give the name of the peptide (shown below) by namlng the amlno aclds from the N-terminal to the C- terminal. Use the long name, the 3-letter abbreviation and the 1-letter abbreviation. What is the pl of this peptide? Name Compositon Fxnction LOcalizatio Bradykinl Inflammatio Different n and H N vasodilation Cells HNH n Animal H. HNH H NH он HN N HOf the fallowing is uot a cid? Which af branded chain amino a) Valin b) Isoleucine Lucine A LeysineWhich method of chromatography would be the most appropriate for separating mixtures of thefollowing peptides at a neutral pH? (a) ARDDEKLLML, LMYWWILLDETSARALIV, DQNNA(b) GATSKKIVLM, ASCILLVMEN, MFDDAAYVNE(c) KLMDAATSPFLMAGHHHHHH, MFPSATEKRQQNNESTVLAG In what order would the following peptides be eluted from an anion exchange column at pH 7.5?Peptide 1: Ala–Asp–Glu–Gln–Trp–Leu–His–ValPeptide 3: Phe–Gln–Glu–Ala–Gln–His–Leu–Arg-IlePeptide 2: Arg–Ile–Pro–Lys–Cys–Met–Lys
- S1.What functional group (pictured below) is used in the formation of ATP, the backbone of DNA, and the plasma membrane? R. - HO- asluolom OgH 910m ansa obyd to inuoms adisi69 101 P- Hnedenoi HO 9tom anisinos H 19w 1639 eniv blut viend ou nontel:oceansied bol-ngtsl s19 1591 a. Amino b. Carbonyl c. Ester d. Phosphate e. Alcohol Sabios onime Tertio of bensemoo Insietib ti aolem tsrll blas onims ns to neg at to quang ly snodibod for ogh quotgSecond letter A UUU UCU) UC UCA UCG UAU UUC Phe UUA Tyr UGU UGCJ Ser UAA Stop UGA Stop A UAG Stop UGG Trp UUG Leu CAUHIS CUU CUC CUA CUG CCU* C ССА CCG CGU His САС Leu CGC Arg CGA Pro CAA Gin CGGJ Gln Which amino acid is carried by the TRNA with the anticodon 5'-UCA-3? ACU ACC ACA AAU AAC. AGU AGC AGA AUU Ser Asn AUC Ile A AUA Thr AAA Lys AAG Lys AGG Arg AUG Met ACG GAU GGU] GUU GUC GUA GUGJ GCU GCC GCA GCG GAC Asp Ala GAA GGC Gly GGA Val GAG Glu GGGJ Isoleucine. None-this is a stop codon. Aspartic acid. Histidine. IV. Leucine O V. Third letter UCAG UCAG UCAG First letterN- HO sta on e yor current pH the peptide? Explain your yor a) Based the charge state shown, what is a possible vahe amswer wsi'ng 2-3 sentences. Show the qull pH ramge yor this protonation otate 6) Hypo thesize a oingle amino acid substitution Cmutation) that wonld make Your amswer must include the which residue this lic You. peptide more hydrophi you would mutate and what new re sidue would take its place Include a 1 sentence explanation g your reasoning your
