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Thiamine pyrophosphate (TPP) family, PpyrDC subfamily, TPP-binding module; composed of proteins similar to phosphonopyruvate decarboxylase (PpyrDC) proteins. PpyrDC is a homotrimeric enzyme which functions in the biosynthesis of C-P compounds such as bialaphos tripeptide in Streptomyces hygroscopicus. These proteins require TPP and divalent metal cation cofactors.