14460
Here , we describe how PcaV , a MarR family regulator in Streptomyces coelicolor , controls transcription of genes encoding beta - ketoadipate pathway enzymes through its interaction with the pathway substrate , protocatechuate .
 Chemical: protocatechuate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: protocatechuate