Beta-ketoacyl-ACP synthase III 3-oxoacyl-[acyl-carrier-protein] synthase III fabH Catalyzes the condensation reaction of fatty acid synthesis by the addition to an acyl acceptor of two carbons from malonyl-ACP. Catalyzes the first condensation reaction which initiates fatty acid synthesis and may therefore play a role in governing the total rate of fatty acid production. Possesses both acetoacetyl-ACP synthase and acetyl transacylase activities. Its substrate specificity determines the biosynthesis of branched- chain and/or straight-chain of fatty acids (By similarity). aq_1099 MGTKIIGTGVYLPKNVLTNFDLEKIVDTSDEWITTRTGIKERRIAKEETITYMATQAAKEALREANLSPEELDLIILATLTPQKRFPSTACLVQAQLKAKGVYAFDISAACSGFIYALDIADSFIKSGKAKNVLVIGAEKLSEAVDWEDRSTCVLFGDGAGAVVVTRSEDKSDILATRMYAEGSLEELLHADNCGYIRMKGRELFKVAVRSMEEVCREVLEKAGVKPEEVSLVIPHQANVRIINALAEKLNIPKEKVFVNIQKYGNTSAASIPIALHEAIKEGKVKRGDLILMTAMGGGLTWGAVLLRY 309 FABH_AQUAE 3-oxoacyl-[acyl-carrier-protein] synthase 3