This entry includes acetylaranotin biosynthesis cluster protein L (AtaL) from Aspergillus terreus, which is a non-ribosomal peptide synthetase. It is required for the biosynthesis of the toxin acetylaranotin, which is a disulfide bridged cyclic dipeptide [1]. There are a number of steps in the biosyntheis of this epipolythiodioxopiperazine toxin from two phenylananines, but the specific function of AtaL has yet to be determined [1]. Homologues are also known from bacteria.

1: Biosynthetic pathway for the epipolythiodioxopiperazine acetylaranotin in Aspergillus terreus revealed by genome-based deletion analysis. Guo CJ, Yeh HH, Chiang YM, Sanchez JF, Chang SL, Bruno KS, Wang CC; J Am Chem Soc. 2013;135:7205-7213. PMID:23586797