We evaluate the $\mathrm{PQ}\to \mathrm{PQ}$ and $\mathrm{PQ}\to \mathrm{VQ}$ ($P=\mathrm{pseudoscalar}\mathrm{meson}$, $V=\mathrm{vector}\mathrm{meson}$, $Q=\mathrm{quark}$) amplitudes within the $\mathrm{QQ}\overline{Q}$ model proposed by Mitra assuming SU(4) as the relevant internal symmetry. Compared with SU(3), a different combination of the residues of the spectator functions is found to appear in the meson-quark amplitudes. We also show the structures of the amplitudes and their connections with relevant cross sections for various meson-baryon processes assuming SU(4) symmetry. Predictions for charmed-meson production are made. Possible symmetry-breaking effects are also discussed.

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