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

Cell & Bioscience

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

Features	*L. hongkongensis* HLHK9	*N. meningitidis* MC58^b	*N. gonorrhoeae* FA 1090^b	*C. violaceum* ATCC12472	*B. subtilis* 168^b	*E. coli* K12-MG1655^b
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	1^c	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

^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
^bRetrieved from www.membranetransport.org
^cNot listed on www.membranetransport.org, see Krulwich et. al.

ISSN: 2045-3701