[摘要]：The present study reports the cloning and sequencing of lac2 from Bacillus subtilis. The gene is composed of 1542 bp and encodes a 514-amino acid protein. The gene has 86% homology with a published laccase with GeneID 936023. The lac2 gene was deposited in GenBank as a new nucleotide sequence. This new sequence was cloned into the multiple cloning site of pPIC9K to generate pPIC9K-lac2, which was then transformed into Pichia pastoris GS115 via electroporation. The recombinant GS115 (pPIC9K-lac2) was grown initially in BMGY medium and transferred to BMMY to induce gene expression for 48 h. The recombinant Lac2 protein shows laccase activity with cc-naphthol and guaiacol as substrates. The optimal pH is between 3.2 and 4.7, and the optimal temperature is 25 degrees C for enzyme reaction. (C) 2011 Elsevier B.V. All rights reserved.
