Table 2 The key enzymes responsible for different nitrogen metabolism in purple bacteria.

From: Comparative genome analysis of marine purple sulfur bacterium Marichromatium gracile YL28 reveals the diverse nitrogen cycle mechanisms and habitat-specific traits

Species	Fermentative nitrate reduction		Aissimilatory nitrate reduction		Denitrification				Nitrogen fixation
Species	narGHIJ/napAB	nirBD/nrfAH	narB/NR/nasAB	NIT-6/nirA	narGHIJ/napAB	nirK/nirS	norBC	nosZ	nifDKH/anfG
R. palustris CGA009				nirA		nirK	norBC	nosZ	nifDKH/anfG
R. palustris HaA2		nirBD	nasAB	nirA					nifDKH
R. palustris BisB18	napAB				napAB			nosZ	nifDKH/anfG
R. palustris BisB5									nifDKH/anfG
R. palustris BisA53		nirBD	nasAB	nirA		nirK	norBC	nosZ
R. palustris TIE-1				nirA		nirK	norBC	nosZ
R. palustris DX-1				nirA		nirK	norBC	nosZ	nifDKH/anfG
Rhodoplanes sp. Z2-YC6860	narGHIJ	nirBD	nasAB
B. viridis									nifDKH/anfG
B. viridis ATCC19567									nifDKH/anfG
B. viridis DSM_133									nifDKH/anfG
R. vannielii ATCC 17100	napAB				napAB		norBC		nifDKH
R. sphaeroides 2.4.1	napAB				napAB	nirK	norBC		nifDKH
R. sphaeroides ATCC17029							norBC		nifDKH
R. sphaeroides ATCC17025					napAB	nirK	norBC	nosZ	nifDKH
R. sphaeroides KD131						nirK	norBC	nosZ
R. capsulatus SB1003								nosZ	nifDKH/anfG
R. sphaeroides MBTLJ-13	napAB				napAB		norBC		nifDKH
R. sphaeroides MBTLJ-8	napAB				napAB		norBC		nifDKH
R. rubrum ATCC11170									nifDKH/anfG
R. rubrum F11									nifDKH/anfG
R. centenum SW	napAB				napAB		norBC	nosZ	nifDKH
P. photometricum DSM 122									nifDKH/anfG
R. vannielii ATCC17100							norBC		nifDKH/anfG
R. ferrireducens T118	narGHIJ	nirBD	nasAB		narGHIJ		norBC	nosZ
R. sulfidophilum DSM1374									nifDKH
R. sulfidophilum DSM2351									nifDKH
R. sulfidophilum SNK001									nifDKH
R. gelatinosus IL144						nirK	norBC	nosZ	nifDKH
T. violascens DSM198	napAB				napAB				nifDKH
A. vinosum DSM180				nirA			norBC		nifDKH
M. purpuratum 984		otr	nasAB			nirK	norBC		nifDKH
YL28		nrfAH	nasAB	nirA		nirS	norBC		nifDKH
H. halophila SL1	narGHIJ	nrfAH			narGHIJ		norBC		nifDKH
Ectothiorhodospira sp. BSL-9		nrfAH							nifDKH
T. mobilis 8321									nifDKH

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Table 2 The key enzymes responsible for different nitrogen metabolism in purple bacteria.

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