Download MendeleyHeptad insertion extends the E. coli ROP protein by 50.
Karageorgos, I., Gallagher, D.T.(2026) Biodes Res 8: 100061-100061
- PubMed: 42038005 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1016/j.bidere.2025.100061
- Primary Citation Related Structures:
9CFS - PubMed Abstract:
Antibody function involves conformational variability, yet their extreme flexibility complicates measurement of their structure and properties. They also have numerous ligands, suggesting that a rigid bivalent ligand construct of appropriate length could interact with an antibody to reduce its flexibility for imaging, measurement or functional effect. Such a construct would ideally have an inter-ligand spacer that is fairly rigid and with length between 6 and 10 nm. Coiled-coil bundles of alpha helices represent a common motif in protein structure whose relatively simple parallel geometry makes them suitable for rational modification including applications in metrology. In this study, we describe a heptad-insertion heuristic for extending bundles and apply it to the E. coli ROP/ROM protein, which is a 13 kDa, thermostable RNA-binding unit that is naturally a 4-helix dimer and has been engineered to self-associate in various ways to form larger assemblies. We first introduced a tryptophan residue into the core (wild-type lacks tryptophan) to support precise quantitation, and then extended the protein to 150 % of its native length by inserting four helical heptads. We report the engineering process and crystal structures of the tryptophan mutant and the lengthened protein, which also contains a new phenylalanine in the core. Where wild-type has a length of 4.3 nm, the extended variant has length 6.5 nm and may serve as a rigid module for higher order constructs.
- Material Measurement Laboratory of the National Institute of Standards and Technology, 9600 Gudelsky Drive, Rockville, MD, USA.
Organizational Affiliation:
