Table 1.
Overview of all the known hydrogenase enzymes.
Figure 1.
Comparison of cyanobacterial genome sizes and the distribution of the bidirectional NAD(P) linked hydrogenase gene hoxH.
Genomes without the bidirectional hydrogenase are depicted in black and those with it are red. The marine diazotrophic cyanobacteria containing the genes of the uptake hydrogenase hupL are shown in cyan. The cluster of black circles at the lower left end of the line represents the small genomes of the Prochlorococcus and Synechococcus strains.
Table 2.
Occurrence of the bidirectional NAD(P)-linked hydrogenase (HoxH) and the membrane-bound uptake hydrogenase (HupL) in cyanobacteria.
Table 3.
Hydrogenase and HypX sequences used for searches of the completely sequenced genomes and the GOS metagenomic database.
Table 4.
Marine bacteria with FeFe-hydrogenases and NiFe-hydrogenases of the different classes.
Figure 2.
Distribution of bidirectional NAD(P) linked hydrogenases found in the GOS database of the different prokaryotic groups.
The hoxH sequence of Synechocystis sp. PCC 6803 (Table 3) was used for the search and a total of 48 sequences has been found. On the right the number of sequences from the different sampling stations is shown.
Figure 3.
Distribution of membrane-bound hydrogenases found in the GOS database of the different prokaryotic groups.
The hupL sequence of Desulfovibrio vulgaris (Table 3) was used for the search and a total of 51 sequences has been retrieved. On the right the number of sequences from the different sampling stations is shown.
Figure 4.
Distribution of cyanobacterial-like uptake hydrogenases found in the GOS database of the different prokaryotic groups.
The hupL sequence of Nostoc sp. PCC 7120 (Table 3) was used for the search and a total of 35 sequences has been retrieved. On the right the number of sequences from the different sampling stations is shown.
Figure 5.
Distribution of FeFe-hydrogenases found in the GOS database of the different prokaryotic groups.
The hydA sequence of Clostridium pasteurianum (Table 3) was used for the search and a total of 10 sequences have been found. On the right the number of sequences from the different sampling stations is shown.
Figure 6.
Distribution of bidirectional NAD(P) linked hydrogenases in samples taken from Norderpiep (North Sea), Stollergrundrinne (Baltic Sea) and the freshwater lakes Westensee and Selenter See.