On 2016 Mar 11, Daniel Haft commented:

This paper reports an N-terminal sequence of ASEPAVIYDTAGKYDKSFNEAVFYNGD for the carbapenem-hydrolying metallo-beta-lactamase AsbM1, and notes the very low similarity of this sequence fragment to a known metallo-beta-lactamase with similar properties, CphA. Inspection of several genomic sequences that have since become available from closely related strains of Aeromonas showed each has a subclass B2 metallo-beta-lactamases closely related to CphA. In each of those same genomes there is a full-length protein that aligns to the sequence fragment with just one or two mismatches, and that is related to the lipoprotein PnrA (purine nucleoside receptor A) described in PMID:16418175 rather than to any known beta-lactamase. This observation suggests that the carbapenemase AsbM1 studied in this article is an allele of the CphA family, but that a PnrA family protein was the source of the N-terminal sequence shown.

On 2016 Mar 11, Daniel Haft commented:

This paper reports an N-terminal sequence of ASEPAVIYDTAGKYDKSFNEAVFYNGD for the carbapenem-hydrolying metallo-beta-lactamase AsbM1, and notes the very low similarity of this sequence fragment to a known metallo-beta-lactamase with similar properties, CphA. Inspection of several genomic sequences that have since become available from closely related strains of Aeromonas showed each has a subclass B2 metallo-beta-lactamases closely related to CphA. In each of those same genomes there is a full-length protein that aligns to the sequence fragment with just one or two mismatches, and that is related to the lipoprotein PnrA (purine nucleoside receptor A) described in PMID:16418175 rather than to any known beta-lactamase. This observation suggests that the carbapenemase AsbM1 studied in this article is an allele of the CphA family, but that a PnrA family protein was the source of the N-terminal sequence shown.