ATPase. Has a role at an early stage in the morphogenesis of the spore coat and is required for proper coat localization to the forespore. ATP + H2O = ADP + H(+) + phosphate Interacts (via Walker A motif) with SipL (via C-terminus LysM domain). Localized on spore coat surrounding the forespore. Sporulation defects. Defects in proper coat localization around the forespore, but not in cortex formation.