Rotational bands in the odd-proton nucleus 1 7 1 Lu have been populated with the 1 6 0 Gd( 1 9 F, α4n) reaction. High-spin states were observed to a maximum spin of 732 - using the NORD-BALL array. Several new three-quasiparticle bands were observed, including one based on the π12 - [541] ν72 + [633] ν12 - [521] configuration. The signature splitting of this band is inverted from the expected splitting, and this is interpreted as being due to a residual proton-neutron interaction. The contribution of this interaction to the increased crossing frequency observed for the alignment of i 1 3 2 neutrons in the π12 - [541] band is considered. Strong E1 transitions from high-spin levels in the π12 + [411] band to the π12 - [541] band are observed.