Related Experiment Video
Updated: Jan 26, 2026
10:52
Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
Published on: April 13, 2016
9.1K
Improving the Numerical Stability of the NAST Force Field for RNA Simulations
Nils P Petersen1, Thomas Ort2, Andrew E Torda1
1Centre for Bioinformatics , University of Hamburg , Bundesstrasse 43 , 20146 Hamburg , Germany.
Journal of Chemical Theory and Computation
|April 20, 2019
Summary
The NAST improved (NASTI) force field enhances RNA modeling by smoothing energy landscapes, preventing numerical issues. This leads to more stable simulations and comparable or improved structural accuracy compared to the original NAST model.
Area of Science:
- Computational chemistry
- Structural biology
- Biophysics
Background:
- The Nucleic Acid Simulation Tool (NAST) force field is widely used for low-resolution RNA modeling.
- NAST can encounter numerical instabilities due to sharp energy landscapes at certain bond and dihedral angles.
Purpose of the Study:
- To develop an improved RNA force field (NASTI) addressing numerical stability and accuracy issues in NAST.
- To enhance the fitting of experimental RNA structures by refining energy calculations.
Main Methods:
- Modified the dihedral energy term in NAST to smooth energy landscapes.
- Replaced harmonic potentials with spline functions for backbone angles.
- Implemented a more advanced energy calculation for helix-loop regions.
- Re-parametrized the force field using a larger, updated set of RNA structures.
Main Results:
- The NASTI force field demonstrates significantly improved numerical stability, allowing for millions of simulation steps without thermostat intervention.
- NASTI simulations showed comparable or slightly improved structural accuracy, evidenced by GDT-TS scores and RMSD values against crystal structures.
- No decrease in the quality of modeled RNA structures was observed with the NASTI formulation.
Conclusions:
- The NASTI force field offers a more robust and reliable approach for low-resolution RNA modeling compared to the original NAST.
- NASTI successfully mitigates numerical catastrophes while maintaining or enhancing the accuracy of RNA structure prediction.
More Related Videos
Related Concept Videos
01:53RNA Stability
35.7K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.7K
01:24Numerical Calculations
1.2K
In engineering applications, the representation of the numerical value is critical. Presenting or reporting the answer is one of the essential parts of engineering practices. Numerical calculations are performed using handheld calculators or computers since numerically accurate answers are always preferred.
The solution to a problem is obtained using different methods. While manually solving algebraic symbols is one of the most common methods, the graphical method is often preferred. Computers...
The solution to a problem is obtained using different methods. While manually solving algebraic symbols is one of the most common methods, the graphical method is often preferred. Computers...
1.2K
03:18Nuclear Stability
23.0K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
To hold positively charged protons together...
23.0K
01:17Force On A Current Loop In A Magnetic Field
4.0K
Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
4.0K
01:21Pilot and Numeric Relaying
485
Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
485
00:59How Data are Classified: Numerical Data
37.2K
Data that are countable or measurable in specific units are called numerical or quantitative data. Quantitative data are always numbers. Quantitative data are the result of counting or measuring the attributes of a population. Amount of money, pulse rate, weight, number of people living in a town, and number of students who opt for statistics are examples of quantitative data.
Quantitative data may be either discrete or continuous. All quantitative data that take on only specific numerical...
Quantitative data may be either discrete or continuous. All quantitative data that take on only specific numerical...
37.2K