Journal: Open Biol / Year: 2014 Title: The basic keratin 10-binding domain of the virulence-associated pneumococcal serine-rich protein PsrP adopts a novel MSCRAMM fold. Authors: Tim Schulte / Jonas Löfling / Cecilia Mikaelsson / Alexey Kikhney / Karina Hentrich / Aurora Diamante / Christine Ebel / Staffan Normark / Dmitri Svergun / Birgitta Henriques-Normark / Adnane Achour / Abstract: Streptococcus pneumoniae is a major human pathogen, and a leading cause of disease and death worldwide. Pneumococcal invasive disease is triggered by initial asymptomatic colonization of the human ...Streptococcus pneumoniae is a major human pathogen, and a leading cause of disease and death worldwide. Pneumococcal invasive disease is triggered by initial asymptomatic colonization of the human upper respiratory tract. The pneumococcal serine-rich repeat protein (PsrP) is a lung-specific virulence factor whose functional binding region (BR) binds to keratin-10 (KRT10) and promotes pneumococcal biofilm formation through self-oligomerization. We present the crystal structure of the KRT10-binding domain of PsrP (BR187-385) determined to 2.0 Å resolution. BR187-385 adopts a novel variant of the DEv-IgG fold, typical for microbial surface components recognizing adhesive matrix molecules adhesins, despite very low sequence identity. An extended β-sheet on one side of the compressed, two-sided barrel presents a basic groove that possibly binds to the acidic helical rod domain of KRT10. Our study also demonstrates the importance of the other side of the barrel, formed by extensive well-ordered loops and stabilized by short β-strands, for interaction with KRT10.
Mass: 18.015 Da / Num. of mol.: 146 / Source method: isolated from a natural source / Formula: H2O
Has protein modification
Y
-
Experimental details
-
Experiment
Experiment
Method: X-RAY DIFFRACTION / Number of used crystals: 1
-
Sample preparation
Crystal
Density Matthews: 2.53 Å3/Da / Density % sol: 51.41 % / Description: NONE
Crystal grow
Method: vapor diffusion, sitting drop Details: 0.2 M LITHIUM SULFATE, 0.1 M SODIUM ACETATE TRIHYDRATE PH 4.6, 25% PEG4000 (W/V) USING THE SITTING DROP VAPOR-DIFFUSION METHOD FOLLOWED BY MICRO-SEEDING
Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelength
Wavelength: 0.97932 Å / Relative weight: 1
Reflection
Resolution: 2.25→48.35 Å / Num. obs: 61680 / % possible obs: 100 % / Observed criterion σ(I): 3.2 / Redundancy: 4.6 % / Biso Wilson estimate: 36.12 Å2 / Rmerge(I) obs: 0.06 / Net I/σ(I): 14.8
Reflection shell
Resolution: 2.25→2.31 Å / Redundancy: 4.4 % / Rmerge(I) obs: 0.49 / Mean I/σ(I) obs: 3.18 / % possible all: 100
-
Processing
Software
Name
Version
Classification
PHENIX
(PHENIX.REFINE: 1.8.1_1168)
refinement
XDS
datareduction
XSCALE
datascaling
Auto-Rickshaw
phasing
Refinement
Method to determine structure: SAD Starting model: NONE Resolution: 2.25→48.35 Å / SU ML: 0.22 / σ(F): 1.31 / Phase error: 21.32 / Stereochemistry target values: ML Details: NCS AND REFERENCE MODEL TORSION RESTRAINT WERE APPLIED TO CHAINS B/C AND CHAIN A, RESPECTIVELY. CRYSTAL PACKING ANALYSIS REVEALED THAT THE OVERALL MOBILITY OF CHAIN A WAS RELATIVELY HIGHER ...Details: NCS AND REFERENCE MODEL TORSION RESTRAINT WERE APPLIED TO CHAINS B/C AND CHAIN A, RESPECTIVELY. CRYSTAL PACKING ANALYSIS REVEALED THAT THE OVERALL MOBILITY OF CHAIN A WAS RELATIVELY HIGHER COMPARED TO THE MOBILITY OF CHAINS B AND C, AS REFLECTED BY HIGHER OVERALL B-FACTOR VALUES AND LOWER MAP CORRELATION COEFFICIENTS.
Rfactor
Num. reflection
% reflection
Rfree
0.2145
3090
5 %
Rwork
0.186
-
-
obs
0.1874
61669
99.91 %
Solvent computation
Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL
Refinement step
Cycle: LAST / Resolution: 2.25→48.35 Å
Protein
Nucleic acid
Ligand
Solvent
Total
Num. atoms
3991
0
34
146
4171
Refine LS restraints
Refine-ID
Type
Dev ideal
Number
X-RAY DIFFRACTION
f_bond_d
0.01
4105
X-RAY DIFFRACTION
f_angle_d
1.47
5573
X-RAY DIFFRACTION
f_dihedral_angle_d
13.9
1446
X-RAY DIFFRACTION
f_chiral_restr
0.077
618
X-RAY DIFFRACTION
f_plane_restr
0.009
698
LS refinement shell
Resolution (Å)
Rfactor Rfree
Num. reflection Rfree
Rfactor Rwork
Num. reflection Rwork
Refine-ID
% reflection obs (%)
2.25-2.2852
0.282
143
0.2298
2672
X-RAY DIFFRACTION
100
2.2852-2.3226
0.2507
142
0.2207
2656
X-RAY DIFFRACTION
100
2.3226-2.3627
0.2272
138
0.2189
2655
X-RAY DIFFRACTION
100
2.3627-2.4056
0.2505
143
0.2112
2680
X-RAY DIFFRACTION
100
2.4056-2.4519
0.255
137
0.2161
2658
X-RAY DIFFRACTION
100
2.4519-2.502
0.2385
140
0.2157
2660
X-RAY DIFFRACTION
100
2.502-2.5564
0.2616
141
0.2038
2669
X-RAY DIFFRACTION
100
2.5564-2.6158
0.2012
141
0.2063
2658
X-RAY DIFFRACTION
100
2.6158-2.6812
0.2421
138
0.1953
2676
X-RAY DIFFRACTION
100
2.6812-2.7537
0.222
138
0.1979
2654
X-RAY DIFFRACTION
100
2.7537-2.8347
0.2347
143
0.196
2662
X-RAY DIFFRACTION
100
2.8347-2.9262
0.2353
137
0.2014
2671
X-RAY DIFFRACTION
100
2.9262-3.0308
0.2166
137
0.1894
2663
X-RAY DIFFRACTION
100
3.0308-3.1521
0.2521
136
0.1903
2681
X-RAY DIFFRACTION
100
3.1521-3.2956
0.2174
141
0.1931
2648
X-RAY DIFFRACTION
100
3.2956-3.4693
0.2179
140
0.1751
2671
X-RAY DIFFRACTION
100
3.4693-3.6865
0.1806
142
0.1635
2663
X-RAY DIFFRACTION
100
3.6865-3.9711
0.187
143
0.1773
2640
X-RAY DIFFRACTION
100
3.9711-4.3705
0.1956
137
0.1495
2680
X-RAY DIFFRACTION
100
4.3705-5.0023
0.1829
144
0.1371
2668
X-RAY DIFFRACTION
100
5.0023-6.3002
0.179
143
0.1854
2642
X-RAY DIFFRACTION
100
6.3002-48.3614
0.25
146
0.2403
2652
X-RAY DIFFRACTION
99
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
3.9521
-0.4428
-1.1893
7.6897
-0.9056
6.2635
-0.1593
-0.4222
-0.5474
0.5145
-0.0253
-0.0609
0.9271
0.4118
0.1604
0.6558
0.0115
0.0601
0.5589
-0.0185
0.5374
44.1787
47.1334
18.8171
2
2.2648
-0.5382
1.6403
1.359
-0.7043
3.7553
0.0497
-0.1495
-0.2381
0.0399
0.1044
0.0317
0.5619
0.1187
-0.114
0.2728
0.061
0.0009
0.1876
0.0083
0.277
18.1786
40.1689
55.9002
3
2.1375
0.5887
-1.8874
1.4096
-1.0419
5.4311
0.1173
0.0232
0.1815
0.0262
0.0768
0.0869
-0.5948
0.2128
-0.1364
0.2136
-0.0397
0.0164
0.1506
-0.0145
0.2347
17.1184
66.306
34.6647
Refinement TLS group
ID
Refine-ID
Refine TLS-ID
Selection details
1
X-RAY DIFFRACTION
1
CHAINA
2
X-RAY DIFFRACTION
2
CHAINB
3
X-RAY DIFFRACTION
3
CHAINC
+
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