Acts as essential component of the kinetochore MIND complex, which is required for the spindle checkpoint and kinetochore integrity. MIND plays a role in establishing a bipolar spindle-kinetochore interaction by joining kinetochore subunits contacting DNA to those contacting microtubules. Component of the MIND kinetochore complex, which is composed of at least MTW1, NNF1, NSL1 and DSN1. Interacts with NSL1. Associated with the kinetochore. Present with 1310 molecules/cell in log phase SD medium.