Question

5 Template DNA Amino Template DNA Amino acid 3 emplate DNA

The three rows of boxes on this diagram represent a continuous strand of non-template DNA of E. coli.

Identify the location of the promoter region in the DNA sequence on the diagram. (1)

Locate and describe the function of the two conserved DNA sequences within the promoter region. (2)

Indicate the approximate location on the diagram where transcription will start and begin “synthesizing” mRNA at that point. (1)

Identify the location sequence on the diagram that will terminate transcription and stop “synthesizing mRNA after that sequence. (1)

Identify the type of transcription termination that this represents (1)

Identify the location of the sequence on the diagram where the mRNA transcript binds with the ribosome and provide the name of this sequence. (2)

Identify the location where translation would begin on the diagram. (1)

Identify the location where translation would terminate on the diagram. (1)

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Answer #1

DNA:-    1 TGGCCGCTAACTGTAAACTTTACCAAGGCGGACATATTA39

mRNA:- ACCGGCGAUUGACAUUUGAAAUGGUUCCGCCUGUAUAAU

AA:-       ACC|GGC|GAU|UGA|CAU|UUG|AAA|UGG|UUC|CGC|CUG|UAU|AAU

DNA:-    40CCCACTTACTCACAGCCTCCTCCATACTGGACAGGAATC79

mRNA:-GGGUGAAUGAGUGUCGGAGGAGGUAUGACCUGUCCUUAG

AA:-      GGG|UGA|AUG|AGU|GUC|GGA|GGA|GGU|AUG|ACC|UGU|CCU|UAG

DNA:-   80CTTTTCTCTTCGGGCGGATTACTCATCCGAAAAAATCGT119

mRNA:- GAAAAGAGAAGCCCGCCUAAUGAGUAGGCUUUUUUAGCA

AA:-      GAA|AAG|AGA|AGC|CCG|CCU|AAU|GAG|UAG|GCU|UUU|UUA|GCA

At -10 upstream to the start of the transcription initiation site, TATAAT region is present. At -35 upstream to the transcription initiation site, GACATT is present. Both these sites are considered as the contributors of promoter region in E.Coli.

TATAAT and TTGACA are the two conserved sequences in the E.Coli promoter.

Transcription starts from the 49th nucleotide of the DNA sequence. mRNA is synthesized from that point (AGUGUC……)

Transcription is terminated at the poly A sequence ending of DNA

The type of termination of transcription is rho-independent

The ribosome attaches to the mRNA at the 64th nucleotide of mRNA which starts translation for methionine (AUG).

Translation begins at the 64th position of mRNA and protein starts from here.

Translation terminates at the 79th position of mRNA that has the codon of UAG (stop codon)

The sequence of protein is AUGACCUGUCCUUAG

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