1 c3c3wB_
100.0
20
PDB header: transcriptionChain: B: PDB Molecule: two component transcriptional regulatory protein devr;
PDBTitle: crystal structure of the mycobacterium tuberculosis hypoxic response2 regulator dosr
2 c1zn2A_
100.0
19
PDB header: transcription regulatorChain: A: PDB Molecule: response regulatory protein;
PDBTitle: low resolution structure of response regulator styr
3 c1rnlA_
100.0
24
PDB header: signal transduction proteinChain: A: PDB Molecule: nitrate/nitrite response regulator protein narl;
PDBTitle: the nitrate/nitrite response regulator protein narl from narl
4 c3klnC_
100.0
32
PDB header: transcriptionChain: C: PDB Molecule: transcriptional regulator, luxr family;
PDBTitle: vibrio cholerae vpst
5 c1kgsA_
99.9
14
PDB header: dna binding proteinChain: A: PDB Molecule: dna binding response regulator d;
PDBTitle: crystal structure at 1.50 a of an ompr/phob homolog from thermotoga2 maritima
6 c3q9sA_
99.9
17
PDB header: dna binding proteinChain: A: PDB Molecule: dna-binding response regulator;
PDBTitle: crystal structure of rra(1-215) from deinococcus radiodurans
7 c1p2fA_
99.9
14
PDB header: transcriptionChain: A: PDB Molecule: response regulator;
PDBTitle: crystal structure analysis of response regulator drrb, a2 thermotoga maritima ompr/phob homolog
8 c1ys7B_
99.9
15
PDB header: transcription regulatorChain: B: PDB Molecule: transcriptional regulatory protein prra;
PDBTitle: crystal structure of the response regulator protein prra comlexed with2 mg2+
9 c2oqrA_
99.9
13
PDB header: transcription,signaling proteinChain: A: PDB Molecule: sensory transduction protein regx3;
PDBTitle: the structure of the response regulator regx3 from mycobacterium2 tuberculosis
10 c2gwrA_
99.8
15
PDB header: signaling proteinChain: A: PDB Molecule: dna-binding response regulator mtra;
PDBTitle: crystal structure of the response regulator protein mtra from2 mycobacterium tuberculosis
11 c3r0jA_
99.8
17
PDB header: dna binding proteinChain: A: PDB Molecule: possible two component system response transcriptional
PDBTitle: structure of phop from mycobacterium tuberculosis
12 c2hqrA_
99.8
10
PDB header: signaling proteinChain: A: PDB Molecule: putative transcriptional regulator;
PDBTitle: structure of a atypical orphan response regulator protein revealed a2 new phosphorylation-independent regulatory mechanism
13 c3sztB_
99.7
31
PDB header: transcriptionChain: B: PDB Molecule: quorum-sensing control repressor;
PDBTitle: quorum sensing control repressor, qscr, bound to n-3-oxo-dodecanoyl-l-2 homoserine lactone
14 d1s8na_
99.7
10
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
15 c1h0mD_
99.7
20
PDB header: transcription/dnaChain: D: PDB Molecule: transcriptional activator protein trar;
PDBTitle: three-dimensional structure of the quorum sensing protein2 trar bound to its autoinducer and to its target dna
16 c2q0oA_
99.7
22
PDB header: transcriptionChain: A: PDB Molecule: probable transcriptional activator protein trar;
PDBTitle: crystal structure of an anti-activation complex in bacterial quorum2 sensing
17 c3qp5C_
99.7
40
PDB header: transcriptionChain: C: PDB Molecule: cvir transcriptional regulator;
PDBTitle: crystal structure of cvir bound to antagonist chlorolactone (cl)
18 c1zljE_
99.6
33
PDB header: transcriptionChain: E: PDB Molecule: dormancy survival regulator;
PDBTitle: crystal structure of the mycobacterium tuberculosis hypoxic2 response regulator dosr c-terminal domain
19 c3cloC_
99.6
43
PDB header: transcription regulatorChain: C: PDB Molecule: transcriptional regulator;
PDBTitle: crystal structure of putative transcriptional regulator containing a2 luxr dna binding domain (np_811094.1) from bacteroides3 thetaiotaomicron vpi-5482 at 2.04 a resolution
20 d1p4wa_
99.6
21
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: C-terminal effector domain of the bipartite response regulatorsFamily: GerE-like (LuxR/UhpA family of transcriptional regulators)
21 d1yioa1
not modelled
99.6
34
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: C-terminal effector domain of the bipartite response regulatorsFamily: GerE-like (LuxR/UhpA family of transcriptional regulators)
22 c2krfB_
not modelled
99.6
35
PDB header: transcriptionChain: B: PDB Molecule: transcriptional regulatory protein coma;
PDBTitle: nmr solution structure of the dna binding domain of competence protein2 a
23 d1a04a1
not modelled
99.6
38
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: C-terminal effector domain of the bipartite response regulatorsFamily: GerE-like (LuxR/UhpA family of transcriptional regulators)
24 d1fsea_
not modelled
99.6
42
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: C-terminal effector domain of the bipartite response regulatorsFamily: GerE-like (LuxR/UhpA family of transcriptional regulators)
25 d1l3la1
not modelled
99.6
23
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: C-terminal effector domain of the bipartite response regulatorsFamily: GerE-like (LuxR/UhpA family of transcriptional regulators)
26 c2rnjA_
not modelled
99.5
44
PDB header: transcriptionChain: A: PDB Molecule: response regulator protein vrar;
PDBTitle: nmr structure of the s. aureus vrar dna binding domain
27 c3eq2A_
not modelled
99.5
13
PDB header: signaling proteinChain: A: PDB Molecule: probable two-component response regulator;
PDBTitle: structure of hexagonal crystal form of pseudomonas2 aeruginosa rssb
28 c1x3uA_
not modelled
99.5
33
PDB header: transcriptionChain: A: PDB Molecule: transcriptional regulatory protein fixj;
PDBTitle: solution structure of the c-terminal transcriptional2 activator domain of fixj from sinorhizobium melilot
29 c2ayxA_
not modelled
99.5
8
PDB header: transferaseChain: A: PDB Molecule: sensor kinase protein rcsc;
PDBTitle: solution structure of the e.coli rcsc c-terminus (residues2 700-949) containing linker region and phosphoreceiver3 domain
30 c3breA_
not modelled
99.5
15
PDB header: signaling proteinChain: A: PDB Molecule: probable two-component response regulator;
PDBTitle: crystal structure of p.aeruginosa pa3702
31 d1u0sy_
not modelled
99.5
14
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
32 c1w25B_
not modelled
99.5
13
PDB header: signaling proteinChain: B: PDB Molecule: stalked-cell differentiation controlling protein;
PDBTitle: response regulator pled in complex with c-digmp
33 c2rjnA_
not modelled
99.5
12
PDB header: hydrolaseChain: A: PDB Molecule: response regulator receiver:metal-dependent
PDBTitle: crystal structure of an uncharacterized protein q2bku2 from2 neptuniibacter caesariensis
34 d1dz3a_
not modelled
99.5
11
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
35 c3i5aA_
not modelled
99.5
16
PDB header: signaling proteinChain: A: PDB Molecule: response regulator/ggdef domain protein;
PDBTitle: crystal structure of full-length wpsr from pseudomonas syringae
36 d1a04a2
not modelled
99.5
16
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
37 c3rqiA_
not modelled
99.5
14
PDB header: transcriptionChain: A: PDB Molecule: response regulator protein;
PDBTitle: crystal structure of a response regulator protein from burkholderia2 pseudomallei with a phosphorylated aspartic acid, calcium ion and3 citrate
38 d1dbwa_
not modelled
99.5
8
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
39 c3cz5B_
not modelled
99.5
10
PDB header: transcription regulatorChain: B: PDB Molecule: two-component response regulator, luxr family;
PDBTitle: crystal structure of two-component response regulator, luxr family,2 from aurantimonas sp. si85-9a1
40 d1p2fa2
not modelled
99.5
11
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
41 d1krwa_
not modelled
99.5
10
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
42 c2jpcA_
not modelled
99.5
33
PDB header: dna binding proteinChain: A: PDB Molecule: ssrb;
PDBTitle: ssrb dna binding protein
43 c1a2oB_
not modelled
99.5
8
PDB header: bacterial chemotaxisChain: B: PDB Molecule: cheb methylesterase;
PDBTitle: structural basis for methylesterase cheb regulation by a2 phosphorylation-activated domain
44 c3b2nA_
not modelled
99.5
15
PDB header: transcriptionChain: A: PDB Molecule: uncharacterized protein q99uf4;
PDBTitle: crystal structure of dna-binding response regulator, luxr family, from2 staphylococcus aureus
45 d1jbea_
not modelled
99.5
7
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
46 c3lteH_
not modelled
99.5
14
PDB header: transcriptionChain: H: PDB Molecule: response regulator;
PDBTitle: crystal structure of response regulator (signal receiver domain) from2 bermanella marisrubri
47 d2a9pa1
not modelled
99.4
12
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
48 d1a2oa1
not modelled
99.4
8
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
49 d1p6qa_
not modelled
99.4
10
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
50 c3t8yA_
not modelled
99.4
8
PDB header: hydrolaseChain: A: PDB Molecule: chemotaxis response regulator protein-glutamate
PDBTitle: crystal structure of the response regulator domain of thermotoga2 maritima cheb
51 d1zesa1
not modelled
99.4
13
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
52 c2zwmA_
not modelled
99.4
15
PDB header: transcriptionChain: A: PDB Molecule: transcriptional regulatory protein yycf;
PDBTitle: crystal structure of yycf receiver domain from bacillus2 subtilis
53 d1ys7a2
not modelled
99.4
13
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
54 c3eulB_
not modelled
99.4
13
PDB header: transcriptionChain: B: PDB Molecule: possible nitrate/nitrite response transcriptional
PDBTitle: structure of the signal receiver domain of the putative2 response regulator narl from mycobacterium tuberculosis
55 d1peya_
not modelled
99.4
15
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
56 c3gt7A_
not modelled
99.4
13
PDB header: hydrolaseChain: A: PDB Molecule: sensor protein;
PDBTitle: crystal structure of signal receiver domain of signal2 transduction histidine kinase from syntrophus3 aciditrophicus
57 c2zayA_
not modelled
99.4
9
PDB header: signaling proteinChain: A: PDB Molecule: response regulator receiver protein;
PDBTitle: crystal structure of response regulator from desulfuromonas2 acetoxidans
58 d1zh2a1
not modelled
99.4
15
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
59 d2ayxa1
not modelled
99.4
8
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
60 d1k66a_
not modelled
99.4
15
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
61 d1ny5a1
not modelled
99.4
10
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
62 d1w25a1
not modelled
99.4
13
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
63 c3f6cB_
not modelled
99.4
18
PDB header: dna binding proteinChain: B: PDB Molecule: positive transcription regulator evga;
PDBTitle: crystal structure of n-terminal domain of positive transcription2 regulator evga from escherichia coli
64 c1ny5A_
not modelled
99.4
9
PDB header: transcriptionChain: A: PDB Molecule: transcriptional regulator (ntrc family);
PDBTitle: crystal structure of sigm54 activator (aaa+ atpase) in the inactive2 state
65 c3dzdA_
not modelled
99.4
8
PDB header: transcription regulatorChain: A: PDB Molecule: transcriptional regulator (ntrc family);
PDBTitle: crystal structure of sigma54 activator ntrc4 in the inactive2 state
66 d1qkka_
not modelled
99.4
13
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
67 c3khtA_
not modelled
99.4
9
PDB header: signaling proteinChain: A: PDB Molecule: response regulator;
PDBTitle: crystal structure of response regulator from hahella chejuensis
68 c2qzjC_
not modelled
99.4
12
PDB header: transcriptionChain: C: PDB Molecule: two-component response regulator;
PDBTitle: crystal structure of a two-component response regulator from2 clostridium difficile
69 d1mvoa_
not modelled
99.4
15
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
70 c3hv2B_
not modelled
99.4
14
PDB header: signaling proteinChain: B: PDB Molecule: response regulator/hd domain protein;
PDBTitle: crystal structure of signal receiver domain of hd domain-2 containing protein from pseudomonas fluorescens pf-5
71 d2pl1a1
not modelled
99.4
13
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
72 c2jrlA_
not modelled
99.4
9
PDB header: transcriptionChain: A: PDB Molecule: transcriptional regulator (ntrc family);
PDBTitle: solution structure of the beryllofluoride-activated ntrc4 receiver2 domain dimer
73 d1kgsa2
not modelled
99.4
12
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
74 c3nhzA_
not modelled
99.4
14
PDB header: dna binding proteinChain: A: PDB Molecule: two component system transcriptional regulator mtra;
PDBTitle: structure of n-terminal domain of mtra
75 c3cfyA_
not modelled
99.4
12
PDB header: structural genomics, unknown functionChain: A: PDB Molecule: putative luxo repressor protein;
PDBTitle: crystal structure of signal receiver domain of putative luxo2 repressor protein from vibrio parahaemolyticus
76 c3cnbC_
not modelled
99.4
13
PDB header: dna binding proteinChain: C: PDB Molecule: dna-binding response regulator, merr family;
PDBTitle: crystal structure of signal receiver domain of dna binding response2 regulator protein (merr) from colwellia psychrerythraea 34h
77 c3t6kB_
not modelled
99.4
15
PDB header: signaling proteinChain: B: PDB Molecule: response regulator receiver;
PDBTitle: crystal structure of a hypothetical response regulator (caur_3799)2 from chloroflexus aurantiacus j-10-fl at 1.86 a resolution
78 c3jteA_
not modelled
99.4
9
PDB header: protein bindingChain: A: PDB Molecule: response regulator receiver protein;
PDBTitle: crystal structure of response regulator receiver domain2 protein from clostridium thermocellum
79 c3hdgE_
not modelled
99.4
6
PDB header: structural genomics, unknown functionChain: E: PDB Molecule: uncharacterized protein;
PDBTitle: crystal structure of the n-terminal domain of an2 uncharacterized protein (ws1339) from wolinella3 succinogenes
80 c2qr3A_
not modelled
99.4
12
PDB header: transcriptionChain: A: PDB Molecule: two-component system response regulator;
PDBTitle: crystal structure of the n-terminal signal receiver domain of two-2 component system response regulator from bacteroides fragilis
81 d1yioa2
not modelled
99.4
11
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
82 c3cu5B_
not modelled
99.4
10
PDB header: transcription regulatorChain: B: PDB Molecule: two component transcriptional regulator, arac family;
PDBTitle: crystal structure of a two component transcriptional regulator arac2 from clostridium phytofermentans isdg
83 c3mmnA_
not modelled
99.4
9
PDB header: transferaseChain: A: PDB Molecule: histidine kinase homolog;
PDBTitle: crystal structure of the receiver domain of the histidine kinase cki12 from arabidopsis thaliana complexed with mg2+
84 d1xhfa1
not modelled
99.4
7
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
85 d1zgza1
not modelled
99.4
14
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
86 d1i3ca_
not modelled
99.4
16
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
87 d2r25b1
not modelled
99.4
10
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
88 d1dcfa_
not modelled
99.4
9
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: Receiver domain of the ethylene receptor
89 c3h1gA_
not modelled
99.3
11
PDB header: signaling proteinChain: A: PDB Molecule: chemotaxis protein chey homolog;
PDBTitle: crystal structure of chey mutant t84a of helicobacter pylori
90 c3cg4A_
not modelled
99.3
12
PDB header: structural genomics, unknown functionChain: A: PDB Molecule: response regulator receiver domain protein (chey-like);
PDBTitle: crystal structure of response regulator receiver domain protein (chey-2 like) from methanospirillum hungatei jf-1
91 c3a0rB_
not modelled
99.3
12
PDB header: transferaseChain: B: PDB Molecule: response regulator;
PDBTitle: crystal structure of histidine kinase thka (tm1359) in complex with2 response regulator protein trra (tm1360)
92 c3c3mA_
not modelled
99.3
14
PDB header: signaling proteinChain: A: PDB Molecule: response regulator receiver protein;
PDBTitle: crystal structure of the n-terminal domain of response regulator2 receiver protein from methanoculleus marisnigri jr1
93 c3hdvB_
not modelled
99.3
9
PDB header: transcription regulatorChain: B: PDB Molecule: response regulator;
PDBTitle: crystal structure of response regulator receiver protein from2 pseudomonas putida
94 d1heya_
not modelled
99.3
7
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
95 c3grcD_
not modelled
99.3
9
PDB header: transferaseChain: D: PDB Molecule: sensor protein, kinase;
PDBTitle: crystal structure of a sensor protein from polaromonas sp.2 js666
96 c2jk1A_
not modelled
99.3
11
PDB header: dna-bindingChain: A: PDB Molecule: hydrogenase transcriptional regulatory protein hupr1;
PDBTitle: crystal structure of the wild-type hupr receiver domain
97 d1mb3a_
not modelled
99.3
10
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
98 c3snkA_
not modelled
99.3
7
PDB header: signaling proteinChain: A: PDB Molecule: response regulator chey-like protein;
PDBTitle: crystal structure of a response regulator chey-like protein (mll6475)2 from mesorhizobium loti at 2.02 a resolution
99 c3ilhA_
not modelled
99.3
12
PDB header: transcription regulatorChain: A: PDB Molecule: two component response regulator;
PDBTitle: crystal structure of two component response regulator from cytophaga2 hutchinsonii
100 c3hebB_
not modelled
99.3
12
PDB header: transcription regulatorChain: B: PDB Molecule: response regulator receiver domain protein (chey);
PDBTitle: crystal structure of response regulator receiver domain from2 rhodospirillum rubrum
101 c3crnA_
not modelled
99.3
9
PDB header: signaling proteinChain: A: PDB Molecule: response regulator receiver domain protein, chey-like;
PDBTitle: crystal structure of response regulator receiver domain protein (chey-2 like) from methanospirillum hungatei jf-1
102 c2qv0A_
not modelled
99.3
13
PDB header: transcriptionChain: A: PDB Molecule: protein mrke;
PDBTitle: crystal structure of the response regulatory domain of2 protein mrke from klebsiella pneumoniae
103 c2qvgA_
not modelled
99.3
11
PDB header: transferaseChain: A: PDB Molecule: two component response regulator;
PDBTitle: the crystal structure of a two-component response regulator2 from legionella pneumophila
104 d1w25a2
not modelled
99.3
9
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
105 c3cg0A_
not modelled
99.3
13
PDB header: lyaseChain: A: PDB Molecule: response regulator receiver modulated diguanylate cyclase
PDBTitle: crystal structure of signal receiver domain of modulated diguanylate2 cyclase from desulfovibrio desulfuricans g20, an example of alternate3 folding
106 c3gl9B_
not modelled
99.3
12
PDB header: signaling proteinChain: B: PDB Molecule: response regulator;
PDBTitle: the structure of a histidine kinase-response regulator2 complex sheds light into two-component signaling and3 reveals a novel cis autophosphorylation mechanism
107 c3i42A_
not modelled
99.3
10
PDB header: structural genomics, unknown functionChain: A: PDB Molecule: response regulator receiver domain protein (chey-
PDBTitle: structure of response regulator receiver domain (chey-like)2 from methylobacillus flagellatus
108 c3luaA_
not modelled
99.3
14
PDB header: transcription regulatorChain: A: PDB Molecule: response regulator receiver protein;
PDBTitle: crystal structure of a signal receiver domain of two component signal2 transduction (histidine kinase) from clostridium thermocellum
109 c3kcnA_
not modelled
99.3
12
PDB header: lyaseChain: A: PDB Molecule: adenylate cyclase homolog;
PDBTitle: the crystal structure of adenylate cyclase from2 rhodopirellula baltica
110 c2nt3A_
not modelled
99.2
9
PDB header: signaling proteinChain: A: PDB Molecule: response regulator homolog;
PDBTitle: receiver domain from myxococcus xanthus social motility protein frzs2 (y102a mutant)
111 c3hzhA_
not modelled
99.2
10
PDB header: signaling proteinChain: A: PDB Molecule: chemotaxis response regulator (chey-3);
PDBTitle: crystal structure of the chex-chey-bef3-mg+2 complex from2 borrelia burgdorferi
112 c2rdmB_
not modelled
99.2
8
PDB header: structural genomics, unknown functionChain: B: PDB Molecule: response regulator receiver protein;
PDBTitle: crystal structure of response regulator receiver protein from2 sinorhizobium medicae wsm419
113 c3eqzB_
not modelled
99.2
15
PDB header: structural genomics, unknown functionChain: B: PDB Molecule: response regulator;
PDBTitle: crystal structure of a response regulator from colwellia2 psychrerythraea
114 c3nhmA_
not modelled
99.2
10
PDB header: signaling proteinChain: A: PDB Molecule: response regulator;
PDBTitle: crystal structure of a response regulator from myxococcus xanthus
115 c3lufB_
not modelled
99.2
11
PDB header: signaling proteinChain: B: PDB Molecule: two-component system response regulator/ggdef
PDBTitle: structure of probable two-component system response2 regulator/ggdef domain protein
116 c2qxyB_
not modelled
99.2
9
PDB header: transcriptionChain: B: PDB Molecule: response regulator;
PDBTitle: crystal structure of a response regulator from thermotoga2 maritima
117 c3m6mF_
not modelled
99.2
8
PDB header: lyase/transferaseChain: F: PDB Molecule: sensory/regulatory protein rpfc;
PDBTitle: crystal structure of rpff complexed with rec domain of rpfc
118 c3eodA_
not modelled
99.2
12
PDB header: signaling proteinChain: A: PDB Molecule: protein hnr;
PDBTitle: crystal structure of n-terminal domain of e. coli rssb
119 d1k68a_
not modelled
99.2
10
Fold: Flavodoxin-likeSuperfamily: CheY-likeFamily: CheY-related
120 c2j48A_
not modelled
99.2
18
PDB header: transferaseChain: A: PDB Molecule: two-component sensor kinase;
PDBTitle: nmr structure of the pseudo-receiver domain of the cika2 protein.