Heat-resistant cysteine synthase

摘要

The inventor isolated heat-resistant cysteine synthase having substantially no decline in activity after heat treatment at 80° C. for 6 hours from the hyperthermophilic archaea Aeropyrum pernix, and determined the amino acid sequence and base sequence. The DNA encoding this enzyme is DNA consisting of the base sequence set forth in SEQ ID NO: 1. The enzyme has the amino acid sequence set forth in SEQ ID NO: 2. The enzyme can be used to carry out an efficient enzyme reaction on highly concentrated substrates prepared at elevated temperatures.