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. NSL1 facilitates the attachment of two of the DASH complex components, DAD2 and SPC19, to the kinetochore in a microtubule-dependent manner. Component of the MIND kinetochore complex, which is composed of at least MTW1, NNF1, NSL1 and DSN1. Interacts with DSN1. Associated with the kinetochore (PubMed:12455957, PubMed:14657030). Present with 3710 molecules/cell in log phase SD medium.