Phylogenetic trees of Fd- and NAD(P)H-GOGATs. A,
Tree for Fd-GOGAT and the large subunit (or the N-terminal domain) of
NAD(P)H-GOGAT; B, tree for the small subunit (or the C-terminal domain)
of NAD(P)H-GOGAT. The trees were constructed with the UPGMA program as
described in Methods. Included sequences are from
Antithamnion sp. Fd-GOGAT (Valentin et al.,
1993), maize Fd-GOGAT (Sakakibara et al., 1991), P.
boryanum Fd-GOGAT (GlsF) and NADH-GOGAT (GltB and GltD) (this
study), alfalfa NADH-GOGAT (Gregerson et al., 1993),
Synechocystis sp. PCC 6803 Fd-GOGATs (GltS and GltB)
(Navarro et al., 1995), Synechocystis sp. PCC 6803
sll1027 (Kaneko et al., 1996), Azospirillum brasilense
NADPH-GOGAT (GltB and GltD) (Pelanda et al., 1993), and E.
coli NADPH-GOGAT (GltB and GltD) (Oliver et al., 1987).