Fig. 2: Structures of archaella in comparison.
From: Towards a molecular picture of the archaeal cell surface
a structure of S. acidocaldarius ArlB in ribbon representation. N-terminal α-helix tail in red, globular head domain in white, and glycosylation domain in cyan. Glycans are shown as orange sticks. b comparison of archaellins from the crenarchaeon S. acidocaldarius (this study) and S. islandicus57 (PDB-8CWM) with those of the euryarchaeal species M. villosus33 (ArlB1 and ArlB2; PDB-7OFQ), M. maripaludis32 (PDB-5Z1L), P. furiosus31 (PDB-5O4U) and M. hungatei30 (PDB-5TFY). While all archaella are glycosylated, they were only modelled for S. acidocaldaius and M. villosus, (orange sticks). Where glycans were not modelled, the modified Asn residues are highlighted in orange. c, d Comparison of assembled archaellum from S. acidocaldarius with those of the euryarchaeal species M. villosus (ArlB1 and ArlB2; PDB-7OFQ), M. maripaludis (PDB-5Z1L), P. furiosus (PDB-5O4U) and M. hungatei (PDB-5TFY) in side view (c) and end-on view (d). The glycosylation ridges in S. acidocaldarius are highlighted in cyan and glycans or glycosylated Asn residues as orange sticks. Diameters of the filaments are indicated.
