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CYSTEINE-FREE NCL

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Development of a new methodology for the synthesis of mercapto amino acids for p...

Development of a new methodology for the synthesis of mercapto amino acids for protein synthesis by cysteine free native chemical ligation Proteins are in the heart of almost every single biological function and therefore are essential tools for drug discovery. Although the use of recombinant DNA techniques has been successfully applied to the synthesis of many prote... ver más

13/04/2016

FUNDACIO INSTITUT...

173K€

Presupuesto del proyecto: 173K€

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FUNDACIO INSTITUT DE RECERCA BIOMEDICA IRB BA... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5 | 23M€

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Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2016-04-13 No tenemos la información de la convocatoria

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Líder del proyecto

FUNDACIO INSTITUT DE RECERCA BIOMEDICA IRB BA... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5 | 23M€

Presupuesto del proyecto 173K€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto Proteins are in the heart of almost every single biological function and therefore are essential tools for drug discovery. Although the use of recombinant DNA techniques has been successfully applied to the synthesis of many proteins, the access to proteins bearing non natural amino acids, naturally obtained through post-translational modifications, remains limited. However, with the invention of Solid Phase Peptide Synthesis (SPPS) by Merrifield, the total chemical synthesis of peptide containing non-proteinogenic amino acids can be easily achieved. Nonetheless, the SPPS technique is only suitable for peptide chains of a length below 50 amino acids. The problem related to the synthesis of large peptide or even proteins was overcome by Kent et al. who were able to link peptide fragments together by Native Chemical Ligation (NCL). NCL involves the reaction between the N terminus cysteine of a first fragment and the thioester C-terminus of a second fragment. After the transthioesterification, a S -> N acyl transfer yields the desired native amide bond. Despite this ground-breaking discovery, NCL remains limited to cysteine-containing proteins. In 2001, Dawson et al. introduced the ligation-desulfurisation technique. This latest advance paved the way to cysteine free NCL and prompted many research groups to focus their efforts on the preparation of beta- and gamma-mercapto amino acids for use in ligation-desulfurisation strategy. Unfortunately, the 7 to 16 steps required for their synthesis considerably restrain their uses by peptide chemists. The proposed project is directed towards the elaboration of a straightforward synthetic route to access beta-thiol amino acids from a single precursor using the latest breakthroughs in C-H activation technique. In order to demonstrate the usefulness of these novel building blocks for the synthesis of proteins, these cysteine surrogates will be employed in the synthesis of the cysteine-free anti-HIV protein, Griffithsin.

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