  We present a simplified model of the dynamics of translocation of RNA through
a nanopore which only allows the passage of unbound nucleotides. In particular,
we consider the disorder averaged translocation dynamics of random,
two-component, single-stranded nucleotides, by reducing the dynamics to the
motion of a random walker on a one-dimensional free energy landscape of
translocation. These translocation landscapes are calculated from the folds of
the RNA sequences and the voltage bias applied across the nanopore. We compute
these landscapes for 1500 randomly drawn two-letter sequences of length 4000.
Simulations of the dynamics on these landscapes display anomalous
characteristics, similar to random forcing energy landscapes, where the
translocation process proceeds slower than linearly in time for sufficiently
small voltage biases across the nanopore, but moves linearly in time at large
voltage biases. We argue that our simplified model provides an upper bound to
the more realistic translocation dynamics, and thus we expect that all RNA
translocation models will exhibit anomalous regimes.
