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Table 9 Cation/proton antiporters identified in L. hongkongensis, N. meningitidis, N. gonorrhoeae and C. violaceum; and the model bacterial organisms, B. subtilis and E. coli

From: Environmental adaptability and stress tolerance of Laribacter hongkongensis: a genome-wide analysis

Features L. hongkongensis HLHK9 N. meningitidis MC58b N. gonorrhoeae FA 1090b C. violaceum ATCC12472 B. subtilis 168b E. coli K12-MG1655b
Genome size (Mb)a 3.17 2.27 2.15 4.75 4.22 4.64
Total no. of transporter proteins 442 103 96 564 298 354
No. of identified transporters per Mb genome 139 45.4 44.7 119 71.0 76.3
No. of cation/proton antiporters 6 4 4 3 6 7
Monovalent cation:proton antiporter-1 (CPA1) family 0 1 1 0 1 2
Monovalent cation:proton antiporter-2 (CPA2) family 4 1 1 3 2 3
Monovalent cation (K+ or Na+):proton antiporter-3 (CPA3) family 0 0 0 0 1c 0
NhaA Na+:H+ antiporter family 0 0 0 0 0 1
NhaB Na+:H+ antiporter family 0 0 0 0 0 1
NhaC Na+:H+ antiporter family 2 2 2 0 2 0
NhaD Na+:H+ antiporter family 0 0 0 0 0 0
  1. aGenome size data obtained from www.ncbi.nlm.nih.gov/projects/genome/, calculations based on data from www.membranetransport.org and with updated number of transporters in our annotation
  2. bRetrieved from www.membranetransport.org
  3. cNot listed on www.membranetransport.org, see Krulwich et. al.