6DSL image
Entry Detail
PDB ID:
6DSL
Keywords:
Title:
Consensus engineered intein (Cat) with atypical split site
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2018-06-14
Release Date:
2018-09-19
Method Details:
Experimental Method:
Conformers Calculated:
256
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Consensus engineered intein CatN
Chain IDs:A
Chain Length:33
Number of Molecules:1
Biological Source:Enterobacteria phage T7
Polymer Type:polypeptide(L)
Description:Consensus engineered intein CatC
Chain IDs:B
Chain Length:118
Number of Molecules:1
Biological Source:Enterobacteria phage T7
Ligand Molecules
Primary Citation
An Atypical Mechanism of Split Intein Molecular Recognition and Folding.
J. Am. Chem. Soc. 140 11791 11799 (2018)
PMID: 30156841 DOI: 10.1021/jacs.8b07334

Abstact

Split inteins associate to trigger protein splicing in trans, a post-translational modification in which protein sequences fused to the intein pair are ligated together in a traceless manner. Recently, a family of naturally split inteins has been identified that is split at a noncanonical location in the primary sequence. These atypically split inteins show considerable promise in protein engineering applications; however, the mechanism by which they associate is unclear and must be different from that of previously characterized canonically split inteins due to unique topological restrictions. Here, we use a consensus design strategy to generate an atypical split intein pair (Cat) that has greatly improved activity and is amenable to detailed biochemical and biophysical analysis. Guided by the solution structure of Cat, we show that the association of the fragments involves a disorder-to-order structural transition driven by hydrophobic interactions. This molecular recognition mechanism satisfies the topological constraints of the intein fold and, importantly, ensures that premature chemistry does not occur prior to fragment complementation. Our data lead a common blueprint for split intein complementation in which localized structural rearrangements are used to drive folding and regulate protein-splicing activity.

Legend

Protein

Chemical

Disease

Primary Citation of related structures