sp|Q7NQC4|RIBB_CHRVO 3,4-dihydroxy-2-butanone 4-phosphate synthase OS=Chromobacterium violaceum (strain ATCC 12472 / DSM 30191 / JCM 1249 / NBRC 12614 / NCIMB 9131 / NCTC 9757) OX=243365 GN=ribB PE=3 SV=1