Difference between revisions of "Part:BBa K200013:Design"

Revision as of 15:37, 18 October 2009 (view source) JamesField (Talk | contribs) (→‎Cleavable Linker) ← Older edit		Latest revision as of 15:37, 18 October 2009 (view source) JamesField (Talk | contribs) (→‎Cleavable Linker)
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	==Cleavable Linker==		==Cleavable Linker==
−	Since polypeptides can only be biologically synthesised if they start with the amino acid methionine, it has been necessary to design a cleavable peptide sequence starting with methionine. This sequence is found upstream of opiorphin and is enzymatically cleaved following incubation with the enzyme enterokinase. Enterokinase is a highly specific serine protease that cleaves after the recognition sequence Aspartic Acid - Aspartic Acid - Aspartic Acid -Aspartic Acid – Lysine.	+	[[Image:Opiorphin.png|left|400px]]Since polypeptides can only be biologically synthesised if they start with the amino acid methionine, it has been necessary to design a cleavable peptide sequence starting with methionine. This sequence is found upstream of opiorphin and is enzymatically cleaved following incubation with the enzyme enterokinase. Enterokinase is a highly specific serine protease that cleaves after the recognition sequence Aspartic Acid - Aspartic Acid - Aspartic Acid -Aspartic Acid – Lysine.
−		+
−	[[Image:Opiorphin.png|left|400px]]	+
	The methionine is shown in RED, the protease recognition site is shown in BLUE and opiorphin is shown in GREEN. The RED & BLUE sections make up the removable linker region which is cleaved by the serine protease enterokinase.		The methionine is shown in RED, the protease recognition site is shown in BLUE and opiorphin is shown in GREEN. The RED & BLUE sections make up the removable linker region which is cleaved by the serine protease enterokinase.

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Latest revision as of 15:37, 18 October 2009

Opiorphin + EK cleavage site

Design Notes

Cleavable Linker

Since polypeptides can only be biologically synthesised if they start with the amino acid methionine, it has been necessary to design a cleavable peptide sequence starting with methionine. This sequence is found upstream of opiorphin and is enzymatically cleaved following incubation with the enzyme enterokinase. Enterokinase is a highly specific serine protease that cleaves after the recognition sequence Aspartic Acid - Aspartic Acid - Aspartic Acid -Aspartic Acid – Lysine.

The methionine is shown in RED, the protease recognition site is shown in BLUE and opiorphin is shown in GREEN. The RED & BLUE sections make up the removable linker region which is cleaved by the serine protease enterokinase.

Stop Codon

A double stop codon has been incorporated into the sequence to ensure efficient termination.

Codon Choice

The sequence has been optimised for expression in E.coli.

Source

Synthetic part.

References