component of the [[protein|00BDD4E3370DB3A9F4D75FE265A2A8DF05185CCC]]-[[protein|3282D2C25468776881778006F182FCF322C4821D]] type III secretion system residing in the forespore membrane, required for anchoring of proteins on both sides of the sporulation septum, required for localization and stability of [[protein|7C8DFE00A2B2B30CC8BEB35055D92CC2E4128F3A]]