Fig. 4.

Ectoine-degradation gene organization in H. elongata and other bacteria. Ectoine hydrolase genes (doeA) are blue, Nα-acetyl-l-2,4-diaminobutyric acid deacetylase genes (doeB) are red, genes for AsnC/Lrp-like DNA-binding protein DoeX are pink (doeX), aspartate-semialdehyde dehydrogenase genes (doeC) are green, l-2,4-diaminobutyric acid transaminase genes (doeD) are yellow, eutB (putative threonine dehydratase) are light grey, eutC (putative ornithine cyclodeaminase) are dark grey. The gene doeA and doeB are homologues of eutD and eutE respectively. Only ectoine-degradation genes from bacteria with known genome sequences are depicted. Organisms carrying at least the two genes, doeA and doeB, could only be found in the proteobacteria domain. The accession numbers of all doe genes are listed in Table S6.