  In the context of noncommutative space-time, we investigate the nucleon
structure functions which plays an important role to identify the internal
structure of nucleons. We use the corrected vertices and employ new vertices
that appear in two approaches of noncommutativity and calculate the proton
structure functions in terms of noncommutative tensor \theta_{\mu\nu}. To check
our result, we plot the nucleon structure function (NSF), F_2(x), and compare
it with experimental data and the result coming out from the GRV, GJR and CT10
parametrization models. We show that new vertex which is arising the
noncommutativity correction will lead us to better consistency between
theoretical result and experimental data for NSF. This consistency would be
better at small values of x-Bjorken variable. To indicate and confirm the
validity of our calculations, we also act conversely and obtain an lower bound
for the numerical values of \Lambda_{NC} scale which are corresponding to the
recent reports.
