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. Author manuscript; available in PMC: 2010 Jan 13.
Published in final edited form as: Nature. 2008 Jan 30;451(7180):851–854. doi: 10.1038/nature06530

Figure 1.

Figure 1

Three-dimensional structure of the archaeal RNAP. a, 3.4 Å resolution crystal structure of the S. solfataricus RNAP. Each subunit is denoted by a unique color (see surface representations in Fig. 2 for color-code and subunit-subunit interaction). The disordered clamp head domain is indicated as a dotted line. b, 1.76 Å resolution crystal structure of the D/L subcomplex (red, D subunit; yellow, L subunit). Domain organization is shown. c, Close-up view of the 4Fe-4S cluster binding domain (residues 167–222 of the D subunit). Electron density calculated using the Fe anomalous signal is shown in black mesh (sigma cutoff =5).