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Updated: Aug 23, 2026

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase
09:31

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase

Published on: September 26, 2020

Tryptophan pyrrole ring cleavage enzymes in placenta

Yohsuke Minatogawa1, Sachiko Suzuki, Yoko Ando

  • 1Department of Biochemistry, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama, 701-0192 Japan. minato@bcc.kawasaki-m.ac.jp

Advances in Experimental Medicine and Biology
|June 23, 2004
PubMed

Tryptophan pyrrole ring cleavage enzymes were assayed in pregnant uterus of mouse. The highest activity was observed at 6.5 days post-coitus (dpc) with a small activity shoulder at 9.5 to 12.5 dpc concepti and placenta. The highest peak at early concepti of 6.5 dpc was coincided with gene expression of tryptophan 2,3-dioxygenase (TDO). And the shoulder from 9.5 dpc was coincided with the expression of indoleamine 2,3-dioxygenase (IDO). These enzymes showed a different inhibitory behavior to a proper IDO inhibitor, 1-methyl tryptophan. In situ hybridization analysis revealed that TDO was expressed in the decidua of the early concepti. This is the first report of the extra hepatic TDO.

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