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. {ECO:0000269|PubMed:12455957; ECO:0000269|PubMed:14633972; ECO:0000269|PubMed:14657030}.