A further inaccuracy concerns the functional annotation of the suxA gene product, which is described as a "TonB-like porin", "transporter of the TonB family", or "outer membrane ß-barrel TonB-family transporter". At this point, I would like to clarify that TonB is neither a porin nor a transporter, nor an outer membrane protein, nor a protein with a β-barrel structure. The three-dimensional structure of TonB has already been determined on several occasions, with perhaps the most impressive piece of work being a recently published paper on the cryo-EM structure of the Ton motor complex of Escherichia coli (https://doi.org/10.1038/s41467-025-61286-z). To familiarise yourself better with the subject, I highly recommend reading a recently published review article on substrate uptake by TonB-dependent outer membrane transporters, which act in conjunction with TonB and other membrane proteins. The article was written by a pioneer in TonA and TonB research, my esteemed doctoral supervisor, Volkmar Braun (https://doi.org/10.1111/mmi.15332). In fact, SuxA is precisely such a protein, namely a TonB-dependent outer membrane transporter.