  We present results on the axial and the electromagnetic form factors of the
nucleon, as well as, on the first moments of the nucleon generalized parton
distributions using maximally twisted mass fermions. We analyze two N_f=2+1+1
ensembles having pion masses of 210 MeV and 354 MeV at two values of the
lattice spacing. The lattice scale is determined using the nucleon mass
computed on a total of 18 N_f=2+1+1 ensembles generated at three values of the
lattice spacing, $a$. The renormalization constants are evaluated
non-perturbatively with a perturbative subtraction of ${\cal O}(a^2)$-terms.
The moments of the generalized parton distributions are given in the $\bar{\rm
MS}$ scheme at a scale of $ \mu=2$ GeV. We compare with recent results obtained
using different discretization schemes. The implications on the spin content of
the nucleon are also discussed.
