2CYD CRYSTAL STRUCTURE OF LITHIUM BOUND ROTOR RING OF THE V- ATPASE FROM ENTEROCOCCUS HIRAE HYDROLASE, NTPK, V-ATPASE, NA(+)-ATPASE, LITHIUM, PROTEOLIPID, ENTEROCOCCUS, STRUCTURAL GENOMICS, NPPSFA, NATIONAL PROJECT ON PROTEIN STRUCTURAL AND FUNCTIONAL ANALYSES, RIKEN STRUCTURAL GENOMICS/PROTEOMICS INITIATIVE, RSGI