Patent ID: 7803575

Claim:
A method of using a heat-stable alpha-class carbonic anhydrase comprising: contacting a carbon dioxide-containing medium with a heat stable carbonic anhydrase, wherein carbon dioxide is extracted from the carbon dioxide-containing medium, wherein the alpha-class carbonic anhydrase is an isolated polypeptide selected from the group consisting of: (a) a polypeptide having an amino acid sequence which has at least 96% identity with the amino acid sequence of SEQ ID NO: 2 or SEQ ID NO: 4, or at least 95% identity with the amino acid sequence of SEQ ID NO: 6, or at least 98% identity with the amino acid sequence of SEQ ID NO: 8, or at least 91% identity with the amino acid sequence of SEQ ID NO: 10, or at least 99% identity with the amino acid sequence of SEQ ID NO: 12; (b) a polypeptide selected from the group consisting of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10 and SEQ ID NO: 12, and (c) a fragment of (a) or (b) having carbonic anhydrase activity.