CRYSTAL STRUCTURE OF MQND (TTHA1568), A MENAQUINONE BIOSYNTHETIC ENZYME FROM THERMUS THERMOPHILUS HB8 BIOSYNTHETIC PROTEIN, ALPHA/BETA STRUCTURE, STRUCTURAL GENOMICS, NPPSFA, NATIONAL PROJECT ON PROTEIN STRUCTURAL AND FUNCTIONAL ANALYSES, RIKEN STRUCTURAL GENOMICS/PROTEOMICS INITIATIVE, RSGI 3A3U