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Rational design of an improved photo-activatable intein for the production of head-to-tail cyclized peptides

  • Jana K. Böcker , Wolfgang Dörner and Henning D. Mootz EMAIL logo
Published/Copyright: November 30, 2018

Abstract

Head-to-tail cyclization of genetically encoded peptides and proteins can be achieved with the split intein circular ligation of peptides and proteins (SICLOPPS) method by inserting the desired polypeptide between the C- and N-terminal fragments of a split intein. To prevent the intramolecular protein splicing reaction from spontaneously occurring upon folding of the intein domain, we have previously rendered this process light-dependent in a photo-controllable variant of the M86 intein, using genetically encoded ortho-nitrobenzyltyrosine at a structurally important position. Here, we report improvements on this photo-intein with regard to expression yields and rate of cyclic peptide formation. The temporally defined photo-activation of the purified stable intein precursor enabled a kinetic analysis that identified the final resolution of the branched intermediate as the rate-determining individual reaction of the three steps catalyzed by the intein. With this knowledge, we prepared an R143H mutant with a block F histidine residue. This histidine is conserved in most inteins and helps catalyze the third step of succinimide formation. The engineered intein formed the cyclic peptide product up to 3-fold faster within the first 15 min after irradiation, underlining the potential of protein splicing pathway engineering. The broader utility of the intein was also shown by formation of the 14-mer sunflower trypsin inhibitor 1.

Award Identifier / Grant number: MO 1073/7-1

Funding statement: We thank Stephanie Wulff for technical assistance with MS measurements. This work was supported by the Deutsche Forschungsgemeinschaft, funder id: 10.13039/501100001659, (MO 1073/7-1).

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Received: 2018-09-07
Accepted: 2018-10-31
Published Online: 2018-11-30
Published in Print: 2019-02-25

©2019 Walter de Gruyter GmbH, Berlin/Boston

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