POLYLACTIC ACID DECOMPOSITION METHOD AND POLYLACTIC ACID DECOMPOSER

PROBLEM TO BE SOLVED: To provide techniques capable of efficiently decomposing polylactic acid (PLA) whose use is expanding as a biodegradable plastic, at near normal temperature.SOLUTION: The present invention provides a polylactic acid decomposition method comprising contacting to polylactic acid with polypeptide selected from the group consisting of the following (a)-(c) ; (a): a polypeptide consisting of a specific amino acid sequence and having polylactic acid decomposition activity, (b): a polypeptide consisting of an amino acid sequence in which one or some amino acids are deleted, substituted, added, or inserted in the amino acid sequence described in the (a) and having polylactic acid decomposition activity, as well as (c): a polypeptide consisting of an amino acid sequence having 80% or more sequence identity to the amino acid sequence described in the (a) and having polylactic acid decomposition activity.SELECTED DRAWING: None 【課題】生分解性プラスチックとして利用が拡大しつつあるポリ乳酸（ＰＬＡ）を、常温付近でを効率よく分解可能な技術の提供。【解決手段】下記（ａ）〜（ｃ）からなる群より選択されるポリペプチドを、ポリ乳酸と接触させることを含む、ポリ乳酸の分解方法。（ａ）：特定のアミノ酸配列からなるポリ乳酸分解活性を有するポリペプチド、（ｂ）：（ａ）に記載のアミノ酸配列において１又は複数個のアミノ酸が欠失、置換、付加、又は挿入されたアミノ酸配列からなり、且つポリ乳酸分解活性を有するポリペプチド、（ｃ）：（ａ）に記載のアミノ酸配列と８０％以上の配列同一性を有するアミノ酸配列からなり、且つポリ乳酸分解活性を有するポリペプチド。【選択図】なし