  We report on the results of a recent work, where we explore the possibility
to construct higher-twist parton distributions in a nucleon at some low
reference scale from convolution integrals of the light-cone wave functions
(LCWFs). These WFs provide one with a reasonable description of both polarized
and unpolarized parton densities at large values of the Bjorken variable.
Twist-3 parton distributions are then constructed as convolution integrals of
qqqg and usual three-quark WFs.
