Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_182499_1 (substrate VARCHAR, enzyme VARCHAR)
### Question:
what is the subtrate for enzyme ala dehydratase
### Answer:
SELECT substrate FROM table_182499_1 WHERE enzyme = "ALA dehydratase"