Journal: Cell Rep / Year: 2012 Title: Assembly and regulation of the membrane attack complex based on structures of C5b6 and sC5b9. Authors: Michael A Hadders / Doryen Bubeck / Pietro Roversi / Svetlana Hakobyan / Federico Forneris / B Paul Morgan / Michael K Pangburn / Oscar Llorca / Susan M Lea / Piet Gros / Abstract: Activation of the complement system results in formation of membrane attack complexes (MACs), pores that disrupt lipid bilayers and lyse bacteria and other pathogens. Here, we present the crystal ...Activation of the complement system results in formation of membrane attack complexes (MACs), pores that disrupt lipid bilayers and lyse bacteria and other pathogens. Here, we present the crystal structure of the first assembly intermediate, C5b6, together with a cryo-electron microscopy reconstruction of a soluble, regulated form of the pore, sC5b9. Cleavage of C5 to C5b results in marked conformational changes, distinct from those observed in the homologous C3-to-C3b transition. C6 captures this conformation, which is preserved in the larger sC5b9 assembly. Together with antibody labeling, these structures reveal that complement components associate through sideways alignment of the central MAC-perforin (MACPF) domains, resulting in a C5b6-C7-C8β-C8α-C9 arc. Soluble regulatory proteins below the arc indicate a potential dual mechanism in protection from pore formation. These results provide a structural framework for understanding MAC pore formation and regulation, processes important for fighting infections and preventing complement-mediated tissue damage.
Resolution: 3.5→46.19 Å / Cor.coef. Fo:Fc: 0.8931 / Cor.coef. Fo:Fc free: 0.8864 / Cross valid method: THROUGHOUT / σ(F): 0 Details: IDEAL-DIST CONTACT TERM CONTACT SETUP. RESIDUE TYPES WITHOUT CCP4 ATOM TYPE IN LIBRARY=NAG CA FUC BMA. NUMBER OF ATOMS WITH PROPER CCP4 ATOM TYPE=18928. NUMBER WITH APPROX DEFAULT CCP4 ATOM ...Details: IDEAL-DIST CONTACT TERM CONTACT SETUP. RESIDUE TYPES WITHOUT CCP4 ATOM TYPE IN LIBRARY=NAG CA FUC BMA. NUMBER OF ATOMS WITH PROPER CCP4 ATOM TYPE=18928. NUMBER WITH APPROX DEFAULT CCP4 ATOM TYPE=99. NUMBER TREATED BY BAD NON- BONDED CONTACTS=1.
Rfactor
Num. reflection
% reflection
Selection details
Rfree
0.2697
1214
2.06 %
RANDOM
Rwork
0.2555
-
-
-
obs
0.2558
59017
-
-
Displacement parameters
Biso mean: 157.24 Å2
Baniso -1
Baniso -2
Baniso -3
1-
-8.837 Å2
0 Å2
0 Å2
2-
-
0.1298 Å2
0 Å2
3-
-
-
8.7072 Å2
Refine analyze
Luzzati coordinate error obs: 1.207 Å
Refinement step
Cycle: LAST / Resolution: 3.5→46.19 Å
Protein
Nucleic acid
Ligand
Solvent
Total
Num. atoms
18928
0
100
0
19028
Refine LS restraints
Refine-ID
Type
Dev ideal
Number
Restraint function
Weight
X-RAY DIFFRACTION
t_bond_d
0.007
19482
HARMONIC
2
X-RAY DIFFRACTION
t_angle_deg
1.04
26326
HARMONIC
2
X-RAY DIFFRACTION
t_dihedral_angle_d
6788
SINUSOIDAL
2
X-RAY DIFFRACTION
t_incorr_chiral_ct
X-RAY DIFFRACTION
t_pseud_angle
X-RAY DIFFRACTION
t_trig_c_planes
518
HARMONIC
2
X-RAY DIFFRACTION
t_gen_planes
2781
HARMONIC
5
X-RAY DIFFRACTION
t_it
19479
HARMONIC
20
X-RAY DIFFRACTION
t_nbd
0
SEMIHARMONIC
5
X-RAY DIFFRACTION
t_omega_torsion
3.7
X-RAY DIFFRACTION
t_other_torsion
18.1
X-RAY DIFFRACTION
t_improper_torsion
X-RAY DIFFRACTION
t_chiral_improper_torsion
2587
SEMIHARMONIC
5
X-RAY DIFFRACTION
t_sum_occupancies
X-RAY DIFFRACTION
t_utility_distance
X-RAY DIFFRACTION
t_utility_angle
X-RAY DIFFRACTION
t_utility_torsion
X-RAY DIFFRACTION
t_ideal_dist_contact
22866
SEMIHARMONIC
4
LS refinement shell
Resolution: 3.5→3.59 Å / Total num. of bins used: 20
Rfactor
Num. reflection
% reflection
Rfree
0.2248
91
2.25 %
Rwork
0.2292
3950
-
all
0.2291
4041
-
Refinement TLS params.
Method: refined / Refine-ID: X-RAY DIFFRACTION
ID
L11 (°2)
L12 (°2)
L13 (°2)
L22 (°2)
L23 (°2)
L33 (°2)
S11 (Å °)
S12 (Å °)
S13 (Å °)
S21 (Å °)
S22 (Å °)
S23 (Å °)
S31 (Å °)
S32 (Å °)
S33 (Å °)
T11 (Å2)
T12 (Å2)
T13 (Å2)
T22 (Å2)
T23 (Å2)
T33 (Å2)
Origin x (Å)
Origin y (Å)
Origin z (Å)
1
4.6383
-1.707
-2.6673
4.5854
-0.5438
1.4223
0.0286
-0.0422
0.0224
0.1299
0.0936
-0.3029
0.0743
0.4027
-0.1221
0.0054
0.1278
-0.0435
0.2619
-0.1206
-0.0742
43.9731
-20.2155
-33.5936
2
1.6656
0.0065
0.292
0.962
0.6113
0.5486
0.1858
-0.0517
0.1383
0.157
-0.1116
0.0891
0.038
0.1046
-0.0743
0.2981
0.0599
0.0083
0.1192
-0.0078
-0.0486
6.537
-11.7245
-25.7475
3
2.1729
-0.7135
-0.2719
1.3273
0.1553
1.1775
0.0944
-0.4127
-0.3866
0.5156
0.0097
0.0741
0.5274
0.3345
-0.1041
0.4349
-0.0072
-0.1482
0.1066
-0.0355
-0.3274
15.5645
-27.9654
-11.9654
4
1.6398
0.0784
-0.3717
0.9062
0.293
2.0096
0.2272
0.4783
0.0997
-0.0366
-0.0576
-0.0733
-0.0887
0.0636
-0.1696
-0.089
0.2149
0.004
-0.1241
0.0929
-0.3461
0.2338
-11.9509
-52.9164
5
4.6907
-1.0969
-2.1578
2.0819
2.5948
5.6595
0.0364
0.394
0.3316
-0.0172
0.2352
-0.2041
-0.1399
0.6574
-0.2717
-0.04
0.2062
0.0072
0.121
0.0333
-0.3019
4.4325
-14.2791
-59.1429
6
2.6849
-3.446
-0.2827
3.8131
0.5193
0.007
-0.0266
0.4484
0.118
0.07
0.2195
-0.1831
-0.1381
-0.1283
-0.1929
0.1575
-0.0939
0.2326
0.2415
0.1935
-0.1035
-45.0158
1.581
-23.948
7
0
-1.3833
-0.4678
4.4683
-0.2776
0.2663
0.025
0.0269
0.0738
0.1837
-0.1673
0.2845
0.177
0.1662
0.1423
0.0732
0.3229
0.3337
0.1293
0.1611
0.1346
84.2495
-53.8429
-102.2
8
1.7401
0.2599
-0.8494
1.5019
-0.2077
1.6142
0.1649
-0.3195
-0.2321
0.4201
-0.1187
-0.4572
0.5997
0.0093
-0.0462
0.1002
0.0877
0.0223
-0.0234
-0.0823
-0.018
41.3752
-58.3017
-50.9697
9
1.2187
0.0228
-0.633
2.234
-0.1999
1.2089
-0.2322
-0.1451
-0.1729
-0.2449
0.0082
-0.4999
0.3998
-0.1481
0.224
0.2308
0.1769
0.2342
-0.1125
-0.0468
0.0308
46.5724
-60.5097
-66.5556
10
2.5212
0.555
2.9197
1.9748
0.6659
3.0125
-0.0161
0.5601
-0.1772
-0.0955
0.0366
0.7109
0.3185
-0.1877
-0.0205
0.0356
0.019
-0.2622
0.2577
-0.2091
-0.0904
-15.2354
-25.6086
-69.183
11
5.4768
1.0606
-0.2979
0.0331
0.5965
3.1928
0.0234
0.1916
-0.0374
0.0366
0.3627
-0.345
-0.1246
0.1213
-0.386
0.1372
0.2523
-0.1437
-0.2427
0.077
0.094
-43.2402
-49.1216
-110.47
Refinement TLS group
ID
Refine-ID
Refine TLS-ID
Selection details
1
X-RAY DIFFRACTION
1
CHAINAANDRESSEQ22 : 112
2
X-RAY DIFFRACTION
2
CHAINAANDRESSEQ113 : 253
3
X-RAY DIFFRACTION
3
CHAINAANDRESSEQ254 : 772
4
X-RAY DIFFRACTION
4
CHAINAANDRESSEQ773 : 1234
5
X-RAY DIFFRACTION
5
CHAINAANDRESSEQ1243 : 1375
6
X-RAY DIFFRACTION
6
CHAINAANDRESSEQ1376 : 1676
7
X-RAY DIFFRACTION
7
CHAINBANDRESSEQ22 : 79
8
X-RAY DIFFRACTION
8
CHAINBANDRESSEQ80 : 304
9
X-RAY DIFFRACTION
9
CHAINBANDRESSEQ305 : 642
10
X-RAY DIFFRACTION
10
CHAINBANDRESSEQ643 : 767
11
X-RAY DIFFRACTION
11
CHAINBANDRESSEQ768 : 934
+
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