Be inherited method of detection of the shikuropiazon acid productivity in the strain which belongs to Aspergillus and the like quickly and high accuracy, and shikuropiazon acid and rhinoceros clo aceto acetyl L toriputohuan which is its precusor (CAT) the transformant which is not produced (Inc.) etc offer is designated as purpose.The polynucleotide which the polypeptide below the cord/code is done:(1) the polypeptide which consists of the amino acid arrangement which is shown in arrangement number 2,The polypeptide where 1 or several amino acids are deficient (2) at the time of amino acid arranging which is shown in arrangement number 2, consist of the amino acid arrangement which it is substituted or is added, at the same time, possess poriketaidoshintaze nonribozomarupepuchidoshintetaze activity, or,(3) amino acid arrangement and the whole which are shown in arrangement number 2 being even, the polypeptide which homology of 90% or more (identity) it possesses, at the same time, possesses poriketaidoshintaze nonribozomarupepuchidoshintetaze activity.
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