64 research outputs found
Molecular Logic Computation with Debugging Method
Seesaw gate concept, which is based on a reversible DNA strand branch process, has been found to have the potential to be used in the construction of various computing devices. In this study, we consider constructing full adder and serial binary adder, using the new concept of seesaw gate. Our simulation of the full adder preformed properly as designed; however unexpected exception is noted in the simulation of the serial binary adder. To identify and address the exception, we propose a new method for debugging the molecular circuit. The main idea for this method is to add fan-outs to monitor the circuit in a reverse stepwise manner. These fan-outs are fluorescent signals that can obtain the real-time concentration of the target molecule. By analyzing the monitoring result, the exception can be identified and located. In this paper, examples of XOR and serial binary adder circuits are described to prove the practicability and validity of the molecular circuit debugging method
Pre-training of Equivariant Graph Matching Networks with Conformation Flexibility for Drug Binding
The latest biological findings observe that the traditional motionless
'lock-and-key' theory is not generally applicable because the receptor and
ligand are constantly moving. Nonetheless, remarkable changes in associated
atomic sites and binding pose can provide vital information in understanding
the process of drug binding. Based on this mechanism, molecular dynamics (MD)
simulations were invented as a useful tool for investigating the dynamic
properties of a molecular system. However, the computational expenditure limits
the growth and application of protein trajectory-related studies, thus
hindering the possibility of supervised learning. To tackle this obstacle, we
present a novel spatial-temporal pre-training method based on the modified
Equivariant Graph Matching Networks (EGMN), dubbed ProtMD, which has two
specially designed self-supervised learning tasks: an atom-level prompt-based
denoising generative task and a conformation-level snapshot ordering task to
seize the flexibility information inside MD trajectories with very fine
temporal resolutions. The ProtMD can grant the encoder network the capacity to
capture the time-dependent geometric mobility of conformations along MD
trajectories. Two downstream tasks are chosen, i.e., the binding affinity
prediction and the ligand efficacy prediction, to verify the effectiveness of
ProtMD through linear detection and task-specific fine-tuning. We observe a
huge improvement from current state-of-the-art methods, with a decrease of 4.3%
in RMSE for the binding affinity problem and an average increase of 13.8% in
AUROC and AUPRC for the ligand efficacy problem. The results demonstrate
valuable insight into a strong correlation between the magnitude of
conformation's motion in the 3D space (i.e., flexibility) and the strength with
which the ligand binds with its receptor
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