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- The distal histidine stabilises the iron in heme group of a deoxyhaemoglobin. T/Fwhy leucines are crucial part of GCN4 protein?Explain the signifi cance of the observation that peptides such as fMet-Leu-Phe “activate” the phagocytotic (particle-engulfi ng) functions of mammalian leukocytes (white blood cells).
- What would happen if you changed the anticodon in the Tryptophan tRNA from ACC to AAC? First letter U C A G U UUU Phe UUC Phe UUA Leu UUG Leu CỰU Leu CUC Leu CUA Leu CUG Leu AUU lle AUC lle AUA lle AUG Met GUU Val GUC Val GUA Val GUG Val Second letter C A UCU Ser UCC Ser UCA Ser UCG Ser CCU Pro CCC Pro CCA Pro CCG Pro ACU Thr ACC Thr ACA Thr ACG Thr GCU Ala GCC Ala GCA Ala GCG Ala UAU Tyr UAC Tyr UAA Stop UAG Stop CAU His CAC His CAA Gln CAG Gln AAU Asn AAC Asn AAA Lys AAG Lys GAU Asp GAC Asp GAA Glu GAG Glu G UGU Cys UGC Cys UGA Stop UGG Trp CGU Arg CGC Arg CGA Arg CGG Arg AGU Ser AGC Ser AGA Arg AGG Arg GGU Gly GGC Gly GGA Gly GGG Gly O Tryptophan would be incorporated into peptides where leucine normally goes Tryptophan would be incorporated into peptides where it normally goes ○ Leucine would be incorporated into peptides where Tryptophan normally goes O Histidine would be incorporated into peptides where Leucine normally goes U C A G U C A G U C A G U C A G Third letter10- 00 O SCNSA-SCN10A CDKN1A HANDI VTI1A SYTI • MYOCD 9 10 11 12 13 14 15 16 17 18 19 20 2122 X YMet – Asn – Cys – Phe – Glu – Met – Leu – Arg – Ile – Asp – Glu – Gly – Leu – Arg – Leu – Lys – Ile – Tyr – Lys – Asp mRNA sequence (5’-3’)AUG – AAC – UGU – UUU – GAA – AUG – CUU – CGU – AUU – GAU – GAA – GGU – CUU – CGU – CUU – AAA – AUU – UAU – AAA – GAU - Write the dsDNA that encodes for this peptide
- Sickle cell hemoglobin DNA CACGTAGACTGAGG ACAC.. Sickle cell hemoglobin MRNA Sickle cell hemoglobin AA sequence 4. What type of mutation is this? Please explain why.You are studying how your Lys-Val-Thr tripep de interacts with another pep de, which places an Asp in close proximity to the Lys on your pep de. How would the presence of an Asp side chain affect the pKa of the Lys side chain? Briefly explain your reasoning. (remember pKas are rela ve, pKa=log([H+][A-]/[HA])The following statements about the 'membrane attack complex' (MAC) is incorrect. Explain (i) The structure of the MAC is different for both classical and alternative pathways. (ii) C9 is activated due to cleavage by C8.
- One of the amino acid sequences in the lysozyme protein from the bacterial virus T4 studiesby Streisinger and co-worker was .... Lys – ser – pro – ser – leu – asn – ala – ala – lys. Thisparticular amino acid was found to have changed to lys – val – his –his –leu –met –ala –ala–lys... as a result of a single nucleotide deletion and addition approximately 15 bases apartin the mRNA. Which base was deleted and which was added? Give the altered sequence of bases inthe altered amino acid.One of the amino acid sequences in the lysozyme protein from the bacterial virus T4 studiesby Streisinger and co-worker was .... Lys – ser – pro – ser – leu – asn – ala – ala – lys. Thisparticular amino acid was found to have changed to lys – val – his –his –leu –met –ala –ala–lys... as a result of a single nucleotide deletion and addition approximately 15 bases apartin the mRNA.a. What is the sequence of the nucleotides that produce the original protein.b. Which base was deleted and which was added? Give the altered sequence of bases inthe altered amino acid.A scientist discovers a virus encoding a Protein X that degrades a subunit of the elF4F complex. Knowing that this virus transcribes its own mRNAs in the cytoplasm of human cells, why would Protein X be an effective virulence factor?
