# De novo design of ATPase based on a blueprint optimized for harboring the P‐loop motif

## TL;DR

Scientists designed a new ATPase protein from scratch, which works at high temperatures but not as efficiently as natural enzymes.

## Contribution

A novel ATPase was de novo designed with a blueprint optimized for the P-loop motif, showing thermal stability and ATPase activity.

## Key findings

- The designed ATPase is a monomer with high thermal stability and ATPase activity at temperatures up to 100°C.
- The crystal structure of the designed protein closely matches the design model, including the P-loop motif.
- AlphaFold 2 failed to accurately predict the structure, highlighting challenges in predicting novel protein sequences.

## Abstract

De novo design of proteins has seen remarkable recent progress and has provided understanding of folding and functional expression. However, rationally creating enzymes with high activity comparable to most naturally occurring enzymes remains challenging. Here, we attempted to design an ATPase de novo, through the exploration of an optimal backbone blueprint to incorporate a conserved phosphate binding motif, the P‐loop, into designed structures. The designed protein, based on the identified blueprint, was found to be a monomer with high thermal stability and exhibited ATPase ability. The crystal structure was closely matched to the design model, both at the overall structure level and within the P‐loop motif. Interestingly, AlphaFold 2 was not able to predict the designed structure accurately, indicating the difficulties of predicting folded structures for novel amino acid sequences. Remarkably, the designed protein exhibited ATPase ability even at temperatures around 100°C, with significantly increased activity. However, the ATPase activity was still not comparable to those of naturally occurring enzymes. This suggests that the P‐loop motif alone is insufficient to achieve the high ATPase activity seen in naturally occurring enzymes, indicating that other structural components—such as a binding pocket optimized for the adenine or ribose moieties of ATP, additional catalytic residues, or structural dynamics that facilitate hydrolysis—are necessary to reach such activity levels.