  We use diquark-antidiquark currents to investigate the masses and partial
decay widths of the recently observed mesons $D_{sJ}^{+}(2317)$,
$D_0^{*0}(2308)$ and X(3872), considered as four-quark states, in a QCD sum
rule approach. In particular we investigate the coupling constant
$g_{D_{sJ}DK}$. We found that the $g_{D_{sJ}DK}$ obtained in this four-quark
scenario is smaller than the coupling constant obtained when $D_{sJ}^{+}(2317)$
is considered as a conventional $c\bar{s}$ state.
