sp|Q81IQ6|PUR7_BACCR Phosphoribosylaminoimidazole-succinocarboxamide synthase OS=Bacillus cereus (strain ATCC 14579 / DSM 31 / CCUG 7414 / JCM 2152 / NBRC 15305 / NCIMB 9373 / NCTC 2599 / NRRL B-3711) OX=226900 GN=purC PE=3 SV=2