(S)-2-Methylbutanoyl-[acp]

2 Malonyl-CoA + Acyl-carrier protein + 2 NADPH + 2 H⁺ + S-Adenosyl-L-methionine ⇄ (S)-2-Methylbutanoyl-[acp] + 2 CoA + 2 CO₂ + 2 NADP⁺ + S-Adenosyl-L-homocysteine + H₂O (2.3.1.244)
S-Adenosyl-L-methionine: amet_c, Malonyl-CoA: malcoa_c, Acyl-carrier protein: ACP_c, NADPH: nadph_c, H⁺: h_c