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. Author manuscript; available in PMC: 2010 Aug 1.
Published in final edited form as: Curr Opin Struct Biol. 2009 Aug 7;19(4):396–401. doi: 10.1016/j.sbi.2009.07.013

Figure 2.

Figure 2

Statistical analysis of all known β-barrel membrane protein structures [25]. (a) Histogram of the number of known unique β-barrel membrane proteins, N, vs. the number of β-strands, n. Yellow are prokaryotic proteins, red is the eukaryotic VDAC-1. (b) Combinations of shear numbers, S, and strand numbers, n that have been observed at least once are marked by circles in the same color coding as in panel a. The dashed lines mark the S/n ratios of 1 and 4/3. The corresponding angles between the membrane normal and the β-strands are indicated [19]. β-barrels resulting from a multimerization were not included in the analysis.