  We solve for the light-front wave functions of the nucleon from a light-front
quantum chromodynamics (QCD) effective Hamiltonian with three-dimensional
confinement. We obtain solutions using constituent three quarks combined with
three quarks and one gluon Fock components. The resulting light-front wave
functions provide a good quality description of the nucleon's quark
distribution functions following QCD scale evolution. We present the effects
from incorporating a dynamical gluon on the nucleon's gluon densities, helicity
distribution and orbital angular momentum that constitutes the nucleon spin sum
rule.
