5H7C

Crystal structure of a repeat protein with two Protein A-DHR14 repeat modules

Summary for 5H7C

• Entry DOI: 10.2210/pdb5h7c/pdb
• Related: 5H75 5H76 5H77 5H78 5H79 5H7A 5H7B 5H7D
• Descriptor: Immunoglobulin G-binding protein A, DHR14 (1 entity in total)
• Functional Keywords: synthetic protein, immune system, de novo protein
• Biological source: Staphylococcus aureus; More
• Total number of polymer chains: 2
• Total formula weight: 90732.62

Authors

Youn, S.J.,Kwon, N.Y.,Lee, J.H.,Kim, J.H.,Lee, H.,Lee, J.O. (deposition date: 2016-11-17, release date: 2017-06-28, Last modification date: 2023-11-08)

Primary citation

Youn, S.J.,Kwon, N.Y.,Lee, J.H.,Kim, J.H.,Choi, J.,Lee, H.,Lee, J.O.
Construction of novel repeat proteins with rigid and predictable structures using a shared helix method.
Sci Rep, 7:2595-2595, 2017

PubMed Abstract: Generating artificial protein assemblies with complex shapes requires a method for connecting protein components with stable and predictable structures. Currently available methods for creating rigid protein assemblies rely on either complicated calculations or extensive trial and error. We describe a simple and efficient method for connecting two proteins via a fused alpha helix that is formed by joining two preexisting helices into a single extended helix. Because the end-to-end ligation of helices does not guarantee the formation of a continuous helix, we superimposed 1-2 turns of pairs of connecting helices by using a molecular graphics program. Then, we chose amino acids from the two natural sequences that would stabilize the connecting helix. This "shared helix method" is highly efficient. All the designed proteins that could be produced in Escherichia coli were readily crystallized and had the expected fusion structures. To prove the usefulness of this method, we produced two novel repeat proteins by assembling several copies of natural or artificial proteins with alpha helices at both termini. Their crystal structures demonstrated the successful assembly of the repeating units with the intended curved shapes. We propose that this method could dramatically expand the available repertoire of natural repeat proteins.

PubMed: 28572639
DOI: 10.1038/s41598-017-02803-z

Experimental method

X-RAY DIFFRACTION (2.7 Å)