Clary Fray used the pET vector system to express her prokaryotic amylase enzyme. She added peptone into her culture broth of BL21(DE) Escherichia coli strain to induce protein expression. At the end of the experiment, she discovered that her protein was not expressed. She repeated three more times but her protein of interest was still not produced. (i) (ii) (iii) (iv) (v) Explain the reason why Clary failed to obtain her protein of interest and suggest a solution to troubleshoot this problem. Clary plans to express her protein along with a polyhistidine-tag. Explain the importance of His-tag in protein work. Is DH5a Escherichia coli suitable to propagate the plasmid before protein expression? Besides heat shock method, elaborate another procedure Clary could utilize to transform the recombinant pET vector into the host cell. If her supervisor instructs her to express a gene from gold fish (Carassius auratus), is the expression system she is using now suitable for this experiment? Explain. -

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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Clary Fray used the pET vector system to express her prokaryotic amylase enzyme. She added
peptone into her culture broth of BL21(DE3) Escherichia coli strain to induce protein
expression. At the end of the experiment, she discovered that her protein was not expressed.
She repeated three more times but her protein of interest was still not produced.
(i)
(ii)
(iii)
(iv)
(v)
Explain the reason why Clary failed to obtain her protein of interest and suggest a
solution to troubleshoot this problem.
Clary plans to express her protein along with a polyhistidine-tag. Explain the
importance of His-tag in protein work.
Is DH5a Escherichia coli suitable to propagate the plasmid before protein expression?
Besides heat shock method, elaborate another procedure Clary could utilize to
transform the recombinant pET vector into the host cell.
If her supervisor instructs her to express a gene from gold fish (Carassius auratus), is
the expression system she is using now suitable for this experiment? Explain.
Transcribed Image Text:Clary Fray used the pET vector system to express her prokaryotic amylase enzyme. She added peptone into her culture broth of BL21(DE3) Escherichia coli strain to induce protein expression. At the end of the experiment, she discovered that her protein was not expressed. She repeated three more times but her protein of interest was still not produced. (i) (ii) (iii) (iv) (v) Explain the reason why Clary failed to obtain her protein of interest and suggest a solution to troubleshoot this problem. Clary plans to express her protein along with a polyhistidine-tag. Explain the importance of His-tag in protein work. Is DH5a Escherichia coli suitable to propagate the plasmid before protein expression? Besides heat shock method, elaborate another procedure Clary could utilize to transform the recombinant pET vector into the host cell. If her supervisor instructs her to express a gene from gold fish (Carassius auratus), is the expression system she is using now suitable for this experiment? Explain.
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