Figure 26-1: Structure and morphogenesis of satellite bacteriophage P4 and its helper P2 virions. Panel A. P4 (top) and P2 (bottom) virions. Negative stain with phosphotungstate. The tail structures are about 135 nm long; the P4 and P2 heads are, respectively, 45 nm and 62 nm in diameter. Electron micrograph by Robley C. Williams, University of California, Berkeley. From (43) with permission. Panel B. Structure of the P4 procapsid with the Sid external scaffold (dark ribbon). Reconstruction of P4 procapsids at 26 Å resolution. The procapsids, approximately 400 Å in diameter, were obtained by co-expressing in vivo P2 gpN and P4 Sid. From (35) with permission. Panel C. Comparison of the assembly pathways of P4 and P2 capsids. D indicates a cleaved protein. Redrawn from (34) with permission. (for better image quality, click here for tif image, which may be quite large; may also require screen refreshing plus special software to view; or view larger tif in separate window)

Figure 26-1, Figure 26-2, Figure 26-3, Figure 26-4 ( a,  b ), Figure 26-5, Figure 26-6 ( a,  b,  c ), Figure 26-7,

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