General metabolism of Laribacter hongkongensis: a genome-wide analysis

Cell & Bioscience

Table 5 Comparison of components of the respiratory chains deduced from the genomes of L. hongkongensis, N. meningitidis, N. gonorrhoeae, C. violaceum, E. coli and C. jejuni

Pathway/enzymes	*L. hongkongensis* HLHK9	*C. violaceum* ATCC 12472	*N. gonorrhoeae* FA 1090	*N. meningitidis* MC58	*E. coli* K12 MG1655	*C. jejuni* NCTC 11168
Electron donors
NADH dehydrogenase^a	I	I and II	I and II	I and II	I and II	I^b
Succinate dehydrogenase	+	+	+	+	+	+
Rnf-type electron transport complex	+	-	-	-	+	-
Formate dehydrogenase	+	+	-	-	+	+
Proline dehydrogenase	+	+	+	+	+	+
Electron-transferring flavoprotein dehydrogenase	+	+	+	+	+	-
D-amino acid dehydrogenase	+	+	+	+	+	-
Electron acceptors for aerobic respiration
Cytochrome oxidase (aa₃type)	+	+	-	-	+	-
Cytochrome oxidase (cbb₃type)	+	+	+	+	-	+
Cytochrome oxidase (bd type)	+	+	-	-	+	+
Electron acceptors for anaerobic respiration
Periplasmic nitrate reductase Nap type	+	napA only^c	-	-	+	+
Nitrate reductase Nar type	-	+	-	-	+	-
Fumarate reductase	+	+	+	+	+	+
DMSO reductase	+	-	-	-	+	-
Tetrathionate reductase	+	-	-	-	-	-
F₁F₀ATP synthase	+	+	+	+	+	+

^aTwo types of NADH dehydrogenases (NDH) can function in the respiratory complex I in bacteria. Type I NDH is a proton pumping NADH:ubiquinone oxidoreductase that transfer electron from NADH to ubiquinone for generation of electrochemical proton gradient [75]. Type II NDH is a monomeric enzyme in which NADH oxidation is not coupled to proton pumping [76].
^bThe gene cluster that encodes NADH dehydrogenase I in most bacteria are consisted of 14 different genes. C. jejuni contains 12 of the 14 genes in which nuoE and nuoF are absent [15].
^cThe basic gene components for periplasmic Nap type nitrate reductase to be regarded as functional are napABCD [68]. C. violaceum contains only napA.

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