  There are different assumptions on the substructure of the pentaquarks
$P_c(4380)$ and $P_c(4450)$, newly founded in $J/\psi N $ invariant mass by the
LHCb collaboration, giving consistent mass results with the experimental
observations. The experimental data and recent theoretical studies on their
mass suggest interpretation of these states as spin-3/2 negative-parity and
spin-5/2 positive-parity pentaquarks, respectively. There may exist
opposite-parity states corresponding to these particles, as well. Despite a lot
of studies, however, the nature and internal organization of these pentaquarks
in terms of quarks and gluons are not clear. To this end we need more
theoretical investigations on other physical properties of these states. In
this accordance, we study a strong and dominant decay of the $P_c(4380)$ to
$J/\psi$ and $N$ in the framework of three point QCD sum rule method. An
interpolating current in a molecular form is applied to calculate six strong
coupling form factors defining the transitions of the positive and negative
parity spin-3/2 pentaquark states. The values of the coupling constants are
used in the calculation of the decay widths of these transitions. The obtained
results are compared with the existing experimental data.
