Abstract
Reducing the cost of the nonbonded energy and force computations is of primary importance in molecular mechanics and dynamics simulations of biomolecules. This is because the direct evaluation of these nonbonded interactions involving all atom pairs has the complexity of \(\mathcal{O}({N}^{2})\) where N is the number of atoms. Recall that the bonded terms are local and thus have a linear computational complexity; see homework assignment 8 for a related exercise.
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Notes
- 1.
(For lysozyme): nonbonded cutoffs via group-based electrostatic switch and atom-based Lennard-Jones switch functions, switch buffer 10 to 12 Ã…, pairlist buffer 12 to 13 Ã…, and SHAKE used for all bonds involving hydrogens. (For DNA dodecamer and BPTI): nonbonded cutoffs with periodic boundary conditions (PBC) via atom-based electrostatic and Lennard-Jones switch functions, switch buffer 10 to 12 Ã…, pairlist buffer 12 to 13 Ã…, and SHAKE used for all bonds involving hydrogens.
- 2.
Each step entails an energy and gradient evaluation performed in the CHARMM program. The timings were made on a single Intel Xeon/3GHz processor of a Dell Linux machine.
- 3.
We assume 1 fs timesteps.
- 4.
These two components are also termed ‘fast’ and ‘slow’ because the short-range terms are rapidly varying in time while the long-range terms change more slowly with time; see Chapter 22.
- 5.
A series \(S ={ \sum \nolimits }_{n=1}^{\infty }{a}_{n}\) is conditionally convergent if the infinite sum ∑ n a n converges but ∑ n | a n | diverges. It is also known that the sum for a conditionally convergent series depends on the order of summation. For a n = ( − 1)n + 1 ∕ n, the ‘alternating harmonic series’ \(1 -\frac{1} {2} + \frac{1} {3} -\frac{1} {4} + \cdots \) converges, but the harmonic series \(1 + \frac{1} {2} + \frac{1} {3} + \frac{1} {4} + \cdots \) diverges, though a n → 0 as n → ∞. To see that the sum for finite n terms can be as large as we please for the harmonic series, note that terms can be grouped so that each subsum is larger than \(\frac{1} {2}\): \({\sum \nolimits }_{n=1}^{\infty }\frac{1} {n} =\) \(1 + \left (\frac{1} {2} + \frac{1} {3}\right ) + \left (\frac{1} {4} + \frac{1} {5} + \frac{1} {6} + \frac{1} {7}\right ) + (\mathrm{next\ 8\ terms}) + \cdots > 1 + \frac{1} {2} + \frac{1} {2} + \frac{1} {2} + \cdots \).
- 6.
Simeon Denis Poisson (1781–1840) was a brilliant mathematician whose name frequently appears in text books. The Poisson equation (1812) in potential theory is a result of his discovery that Laplace’s equation for the gravitational force holds only at points where no mass is located (see also Box 10.2).
- 7.
For two functions of time f(t) and g(t) and corresponding Fourier transforms F(f) and F(g), we define the convolution of the two original functions f and g, f ∗ g, as: f ∗ g = ∫ − ∞ ∞ f(τ) g(t − τ)dτ. It can be shown that F(f ∗ g) = F(f) F(g). That is, the Fourier transform of the convolution of two functions (f ∗ g) is just the product of the individual Fourier transforms of those functions.
- 8.
Physicists often refer to this equation as Gauss’ law while mathematicians tend to favor the term Poisson’s equation.
- 9.
We can also write \(\frac{1} {{r}^{2}} \frac{d} {dr}\,\left ({r}^{2} \frac{d} {dr}\right )\Phi (r) = {\kappa }^{2}\,\Phi (r)\).
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Schlick, T. (2010). Nonbonded Computations. In: Molecular Modeling and Simulation: An Interdisciplinary Guide. Interdisciplinary Applied Mathematics, vol 21. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6351-2_10
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