REL PDBe PDBe PDBe 2006-06-29 2006-07-07 2006-09-01 2011-05-26 Type IV pilus structure by cryo-electron microscopy and crystallography: implications for pilus assembly and functions. Craig L Egelman EH Volkmann N Tainer JA Craig L Volkmann N Arvai AS Pique ME Yeager M Egelman EH Tainer JA Type IV pilus structure by cryo-electron microscopy and crystallography: implications for pilus assembly and functions. MOLECULAR CELL 23 651 662 2006 16949362 doi:10.1016/j.molcel.2006.07.004 2hil FULLOVERLAP Type IV pilus filament from Neisseria gonorrhoeae Type IV pilus filament from Neisseria gonorrhoeae
filaments are variable lengths - 1 to 4 microns
thousands of pilin subunits form a helical filament 1 N. gonorrhoeae Type IV pilus
GC-T4P are variable in length and contail thousands of copies of the pilin subunit. A 1-micron length would contain approx. 952 subunits, with a molecular weight of 17.7 kDa/subunit, giving a total molecular weight of approx. 16.8 mDa.
1 helical filament true Neisseria gonorrhoeae C30 bacteria N. gonorrhoeae pilus outer membrane N. gonorrhoeae helical filament 0.3 9.5
50 mM CHES, pH 9.5
Quantifoil holey carbon grids, glow-discharged w/ amyl amine
 ETHANE 100 4.2 OTHER
Vitrification instrument: Vitrobot
Blot for 2.5 sec. before plunging FEI/PHILIPS CM200FEG OTHER BRIGHT FIELD FIELD EMISSION GUN 120 2 1.1 2.5 50000.0 50000.0 GATAN LIQUID NITROGEN 4.5 4.8 4.5 corrected at 135,000X magnification
Images were collected in low dose mode.
2004-06-23 KODAK SO-163 FILM OTHER 12.7 12 10 14. Side entry liquid nitrogen-cooled cryo specimen holder
Native Type IV pili were isoated by shearing from N. gonorrhoeae cells.
10.5 100.8 12.5 OTHER IHRSR
The final map was calculated from ~25,000 overlapping particles (508 Angstrom segments with 95% overlap)
each micrograph
 emd_1236.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 37 37 54 -18 -18 -26 37 37 54 101.6 101.6 152.4 90 90 90 X Y Z -0.810034 3.94621 -0.0000000204282 1.0 2.54 2.54 2.54 2.05 CryoEM map for Neisseria gonorrhoeae Type IV pilus
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 2HI2 RIGID BODY FIT CoAn
Protocol: rigid body. A single asymmetric unit was isolated from the filament reconstruction using the watershed transform (Volkmann, J Struct Biol 138, 123-129, 2002) and used for unconstrained docking of a single pilin molecule. After fitting the subunit and builiding the filament model (PDB code 2HIL) the density map was corrected by scaling the amplitudes to the spherically averaged molecular transform of the filament model to minimize artifacts from amplitude distortion caused by the CTF and other experimental factors. This correction only affects visual appearance and not the subsequent automated docking process, which automatically corrects for amplitude distortions.
real-space density correlation coefficient between the experimental density and the density calculated from the search model REAL