1 c3u97A_ 
 
96.1 
11 
PDB header: hydrolaseChain:  A: PDB Molecule: ribonuclease toxin brnt;PDBTitle:  1.1 angstrom-resolution crystal structure of the brucella abortus2 ribonuclease toxin, brnt
2 c3su8X_ 
 
76.3 
40 
PDB header: apoptosis/signaling proteinChain:  X: PDB Molecule: plexin-b1;PDBTitle:  crystal structure of a truncated intracellular domain of plexin-b1 in2 complex with rac1
3 c4m8nB_ 
 
75.5 
33 
PDB header: signaling proteinChain:  B: PDB Molecule: plexinc1 intracellular region;PDBTitle:  crystal structure of plexinc1/rap1b complex
4 c3hm6X_ 
 
74.9 
40 
PDB header: signaling proteinChain:  X: PDB Molecule: plexin-b1;PDBTitle:  crystal structure of the cytoplasmic domain of human plexin b1
5 c5e6pA_ 
 
74.3 
40 
PDB header: signaling proteinChain:  A: PDB Molecule: plexin-b2;PDBTitle:  plexinb2 cytoplasmic region/pdz-rhogef pdz domain complex
6 c5v6rB_ 
 
73.8 
47 
PDB header: protein bindingChain:  B: PDB Molecule: plexin-d1;PDBTitle:  structure of plexin d1 intracellular domain
7 c3ig3A_ 
 
72.5 
27 
PDB header: signaling protein, membrane proteinChain:  A: PDB Molecule: plxna3 protein;PDBTitle:  crystal structure of mouse plexin a3 intracellular domain
8 c3beyC_ 
 
39.3 
25 
PDB header: structural genomics, unknown functionChain:  C: PDB Molecule: conserved protein o27018;PDBTitle:  crystal structure of the protein o27018 from methanobacterium2 thermoautotrophicum. northeast structural genomics consortium target3 tt217
9 c1p8cD_ 
 
33.8 
22 
PDB header: structural genomics, unknown functionChain:  D: PDB Molecule: conserved hypothetical protein;PDBTitle:  crystal structure of tm1620 (apc4843) from thermotoga2 maritima
10 c6bqzA_ 
 
30.2 
24 
PDB header: ligaseChain:  A: PDB Molecule: tyrosine--trna ligase;PDBTitle:  crystal structure of tyrosine-trna synthetase from acinetobacter2 baumannii with bound l-tyrosine
11 c5dipB_ 
 
28.8 
14 
PDB header: oxidoreductaseChain:  B: PDB Molecule: alkyl hydroperoxide reductase ahpd;PDBTitle:  crystal structure of lpg0406 in reduced form from legionella2 pneumophila
12 c3jxeB_ 
 
26.9 
36 
PDB header: ligaseChain:  B: PDB Molecule: tryptophanyl-trna synthetase;PDBTitle:  crystal structure of pyrococcus horikoshii tryptophanyl-trna2 synthetase in complex with trpamp
13 d2ouwa1 
 
24.2 
21 
Fold: AhpD-likeSuperfamily: AhpD-likeFamily: TTHA0727-like
14 c3gwrA_ 
 
24.1 
8 
PDB header: protein bindingChain:  A: PDB Molecule: putative calcium/calmodulin-dependent protein kinase typePDBTitle:  crystal structure of putative calcium/calmodulin-dependent protein2 kinase type ii association domain (yp_315894.1) from thiobacillus3 denitrificans atcc 25259 at 2.00 a resolution
15 c2qeuA_ 
 
22.9 
14 
PDB header: lyaseChain:  A: PDB Molecule: putative carboxymuconolactone decarboxylase;PDBTitle:  crystal structure of putative carboxymuconolactone decarboxylase2 (yp_555818.1) from burkholderia xenovorans lb400 at 1.65 a resolution
16 d1knca_ 
 
22.3 
24 
Fold: AhpD-likeSuperfamily: AhpD-likeFamily: AhpD
17 d1vkea_ 
 
21.6 
17 
Fold: AhpD-likeSuperfamily: AhpD-likeFamily: CMD-like
18 c2p7pB_ 
 
21.5 
19 
PDB header: metal binding protein, hydrolaseChain:  B: PDB Molecule: glyoxalase family protein;PDBTitle:  crystal structure of genomically encoded fosfomycin resistance2 protein, fosx, from listeria monocytogenes complexed with mn(ii) and3 sulfate ion
19 d1vkeb_ 
 
18.6 
20 
Fold: AhpD-likeSuperfamily: AhpD-likeFamily: CMD-like
20 c2pidB_ 
 
17.9 
26 
PDB header: ligaseChain:  B: PDB Molecule: tyrosyl-trna synthetase;PDBTitle:  crystal structure of human mitochondrial tyrosyl-trna synthetase in2 complex with an adenylate analog
21 d2cwqa1 
 
not modelled 
17.5 
22 
Fold: AhpD-likeSuperfamily: AhpD-likeFamily: TTHA0727-like
22 c2oviA_ 
 
not modelled 
16.9 
5 
PDB header: ligand binding protein, metal transportChain:  A: PDB Molecule: hypothetical protein chux;PDBTitle:  structure of the heme binding protein chux
23 c5cb9A_ 
 
not modelled 
16.3 
9 
PDB header: lyaseChain:  A: PDB Molecule: glyoxalase/bleomycin resistance protein/dioxygenase;PDBTitle:  crystal structure of c-as lyase with mercaptoethonal
24 c1r6uB_ 
 
not modelled 
16.2 
11 
PDB header: ligaseChain:  B: PDB Molecule: tryptophanyl-trna synthetase;PDBTitle:  crystal structure of an active fragment of human tryptophanyl-trna2 synthetase with cytokine activity
25 c2cycB_ 
 
not modelled 
16.2 
18 
PDB header: ligaseChain:  B: PDB Molecule: tyrosyl-trna synthetase;PDBTitle:  crystal structure of tyrosyl-trna synthetase complexed with l-tyrosine2 from pyrococcus horikoshii
26 c6bjuD_ 
 
not modelled 
15.4 
21 
PDB header: unknown functionChain:  D: PDB Molecule: atzh;PDBTitle:  the structure of atzh: a little known member of the atrazine breakdown2 pathway
27 d2rcda1 
 
not modelled 
14.7 
29 
Fold: Cystatin-likeSuperfamily: NTF2-likeFamily: BxeB1374-like
28 d2pjsa1 
 
not modelled 
14.6 
30 
Fold: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseSuperfamily: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseFamily: Antibiotic resistance proteins
29 c5exvD_ 
 
not modelled 
14.5 
20 
PDB header: heme-binding proteinChain:  D: PDB Molecule: hemin-degrading hems.chux domain protein;PDBTitle:  crystal structure of heme binding protein hutx from vibrio cholerae
30 d1r6ta2 
 
not modelled 
14.3 
23 
Fold: Adenine nucleotide alpha hydrolase-likeSuperfamily: Nucleotidylyl transferaseFamily: Class I aminoacyl-tRNA synthetases (RS), catalytic domain
31 c2ph0A_ 
 
not modelled 
14.1 
20 
PDB header: structural genomics, unknown functionChain:  A: PDB Molecule: uncharacterized protein;PDBTitle:  crystal structure of the q6d2t7_erwct protein from erwinia carotovora.2 nesg target ewr41.
32 c1r6tA_ 
 
not modelled 
13.9 
11 
PDB header: ligaseChain:  A: PDB Molecule: tryptophanyl-trna synthetase;PDBTitle:  crystal structure of human tryptophanyl-trna synthetase
33 c3r6aB_ 
 
not modelled 
13.8 
10 
PDB header: isomerase, lyaseChain:  B: PDB Molecule: uncharacterized protein;PDBTitle:  crystal structure of an uncharacterized protein (hypothetical protein2 mm_3218) from methanosarcina mazei.
34 d1vcca_ 
 
not modelled 
13.7 
25 
Fold: DNA topoisomerase I domainSuperfamily: DNA topoisomerase I domainFamily: Vaccinia DNA topoisomerase I, 9 kDa N-terminal fragment
35 c3m2oB_ 
 
not modelled 
13.7 
18 
PDB header: structural genomics, unknown functionChain:  B: PDB Molecule: glyoxalase/bleomycin resistance protein;PDBTitle:  crystal structure of a putative glyoxalase/bleomycin resistance2 protein from rhodopseudomonas palustris cga009
36 c4pavA_ 
 
not modelled 
13.6 
18 
PDB header: unknown functionChain:  A: PDB Molecule: glyoxalase family protein;PDBTitle:  structure of hypothetical protein sa1046 from s. aureus.
37 c5tmxA_ 
 
not modelled 
12.8 
22 
PDB header: transcription regulatorChain:  A: PDB Molecule: protein sini;PDBTitle:  solution structure of sini, antagonist to the master biofilm-regulator2 sinr in bacillus subtilis
38 c2k53A_ 
 
not modelled 
12.6 
17 
PDB header: structural genomics, unknown functionChain:  A: PDB Molecule: a3dk08 protein;PDBTitle:  nmr solution structure of a3dk08 protein from clostridium2 thermocellum: northeast structural genomics consortium3 target cmr9
39 d1lq1a_ 
 
not modelled 
12.6 
26 
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: C-terminal effector domain of the bipartite response regulatorsFamily: Spo0A
40 d3b7ca1 
 
not modelled 
12.1 
26 
Fold: Cystatin-likeSuperfamily: NTF2-likeFamily: SO0125-like
41 c5z08A_ 
 
not modelled 
12.0 
24 
PDB header: cell cycleChain:  A: PDB Molecule: cenp-i;PDBTitle:  the crystal structure of kinetochore subunits cenp-h/i/k triple2 complex
42 d1jifa_ 
 
not modelled 
12.0 
15 
Fold: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseSuperfamily: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseFamily: Antibiotic resistance proteins
43 c3rriB_ 
 
not modelled 
11.9 
33 
PDB header: metal binding proteinChain:  B: PDB Molecule: glyoxalase/bleomycin resistance protein/dioxygenase;PDBTitle:  crystal structure of glyoxalase/bleomycin resistance2 protein/dioxygenase from alicyclobacillus acidocaldarius
44 c3ct8A_ 
 
not modelled 
11.6 
33 
PDB header: lyaseChain:  A: PDB Molecule: putative glyoxalase;PDBTitle:  crystal structure of a putative glyoxalase (np_243026.1) from bacillus2 halodurans at 2.10 a resolution
45 d1fc3a_ 
 
not modelled 
11.5 
26 
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: C-terminal effector domain of the bipartite response regulatorsFamily: Spo0A
46 c2ma3A_ 
 
not modelled 
11.2 
6 
PDB header: replicationChain:  A: PDB Molecule: dna replication initiator (cdc21/cdc54);PDBTitle:  nmr solution structure of the c-terminus of the minichromosome2 maintenance protein mcm from methanothermobacter thermautotrophicus
47 c5ig4A_ 
 
not modelled 
11.1 
6 
PDB header: transferaseChain:  A: PDB Molecule: predicted protein;PDBTitle:  crystal structure of n. vectensis camkii-a hub
48 c3kolA_ 
 
not modelled 
11.0 
19 
PDB header: metal binding proteinChain:  A: PDB Molecule: glyoxalase/bleomycin resistancePDBTitle:  crystal structure of a glyoxalase/dioxygenase from nostoc2 punctiforme
49 d2hqva1 
 
not modelled 
10.8 
21 
Fold: Heme iron utilization protein-likeSuperfamily: Heme iron utilization protein-likeFamily: ChuX-like
50 c2k5eA_ 
 
not modelled 
10.8 
22 
PDB header: structural genomics, unknown functionChain:  A: PDB Molecule: uncharacterized protein;PDBTitle:  solution structure of putative uncharacterized protein2 gsu1278 from methanocaldococcus jannaschii, northeast3 structural genomics consortium (nesg) target gsr195
51 c5ihxB_ 
 
not modelled 
10.4 
19 
PDB header: ligaseChain:  B: PDB Molecule: tyrosine--trna ligase, mitochondrial;PDBTitle:  crystal structure of a c-terminally truncated aspergillus nidulans2 mitochondrial tyrosyl-trna synthetase
52 c6iptB_ 
 
not modelled 
10.4 
38 
PDB header: transferaseChain:  B: PDB Molecule: all3014 protein;PDBTitle:  crystal structure of a fosfomycin and bleomycin resistant protein from2 anabaena/nostoc cyanobacterium at 1.70 a resolution
53 c3hzrD_ 
 
not modelled 
10.3 
6 
PDB header: ligaseChain:  D: PDB Molecule: tryptophanyl-trna synthetase;PDBTitle:  tryptophanyl-trna synthetase homolog from entamoeba histolytica
54 c3i05B_ 
 
not modelled 
10.1 
16 
PDB header: ligaseChain:  B: PDB Molecule: tryptophanyl-trna synthetase;PDBTitle:  tryptophanyl-trna synthetase from trypanosoma brucei
55 c3w0lD_ 
 
not modelled 
10.1 
18 
PDB header: transferase/transferase inhibitorChain:  D: PDB Molecule: glucokinase regulatory protein;PDBTitle:  the crystal structure of xenopus glucokinase and glucokinase2 regulatory protein complex
56 c6byqA_ 
 
not modelled 
10.0 
28 
PDB header: ligaseChain:  A: PDB Molecule: tyrosine--trna ligase;PDBTitle:  crystal structure of tyrosine-trna ligase from helicobacter pylori g27
57 d2af7a1 
 
not modelled 
9.8 
15 
Fold: AhpD-likeSuperfamily: AhpD-likeFamily: CMD-like
58 c3g12A_ 
 
not modelled 
9.6 
13 
PDB header: lyaseChain:  A: PDB Molecule: putative lactoylglutathione lyase;PDBTitle:  crystal structure of a putative lactoylglutathione lyase from2 bdellovibrio bacteriovorus
59 c2rkjM_ 
 
not modelled 
9.3 
25 
PDB header: ligase/rnaChain:  M: PDB Molecule: tyrosyl-trna synthetase;PDBTitle:  cocrystal structure of a tyrosyl-trna synthetase splicing factor with2 a group i intron rna
60 c1yn5B_ 
 
not modelled 
9.1 
13 
PDB header: unknown functionChain:  B: PDB Molecule: eaph2;PDBTitle:  crystal structures of eap domains from staphylococcus2 aureus reveal an unexpected homology to bacterial3 superantigens
61 d3pvia_ 
 
not modelled 
8.9 
88 
Fold: Restriction endonuclease-likeSuperfamily: Restriction endonuclease-likeFamily: Restriction endonuclease PvuII
62 c6a4zA_ 
 
not modelled 
8.9 
19 
PDB header: biosynthetic proteinChain:  A: PDB Molecule: chap protein;PDBTitle:  oxidase chap
63 c2ip1A_ 
 
not modelled 
8.8 
20 
PDB header: ligaseChain:  A: PDB Molecule: tryptophanyl-trna synthetase;PDBTitle:  crystal structure analysis of s. cerevisiae tryptophanyl trna2 synthetase
64 c4oudB_ 
 
not modelled 
8.8 
31 
PDB header: ligaseChain:  B: PDB Molecule: tyrosyl-trna synthetase;PDBTitle:  engineered tyrosyl-trna synthetase with the nonstandard amino acid l-2 4,4-biphenylalanine
65 c2ts1A_ 
 
not modelled 
8.8 
28 
PDB header: ligase (synthetase)Chain:  A: PDB Molecule: tyrosyl-trna synthetase;PDBTitle:  structure of tyrosyl-t/rna synthetase refined at 2.3 angstroms2 resolution. interaction of the enzyme with the tyrosyl adenylate3 intermediate
66 d2ts1a_ 
 
not modelled 
8.8 
28 
Fold: Adenine nucleotide alpha hydrolase-likeSuperfamily: Nucleotidylyl transferaseFamily: Class I aminoacyl-tRNA synthetases (RS), catalytic domain
67 d1xrka_ 
 
not modelled 
8.7 
25 
Fold: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseSuperfamily: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseFamily: Antibiotic resistance proteins
68 d2gxba1 
 
not modelled 
8.7 
13 
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: "Winged helix" DNA-binding domainFamily: Z-DNA binding domain
69 c2n5jA_ 
 
not modelled 
8.5 
19 
PDB header: hydrolaseChain:  A: PDB Molecule: ribonuclease zc3h12a;PDBTitle:  regnase-1 n-terminal domain
70 d1qbjc_ 
 
not modelled 
8.5 
13 
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: "Winged helix" DNA-binding domainFamily: Z-DNA binding domain
71 c3zf7V_ 
 
not modelled 
8.2 
24 
PDB header: ribosomeChain:  V: PDB Molecule: 60s ribosomal protein l22, putative;PDBTitle:  high-resolution cryo-electron microscopy structure of the trypanosoma2 brucei ribosome
72 d1h3fa1 
 
not modelled 
8.2 
26 
Fold: Adenine nucleotide alpha hydrolase-likeSuperfamily: Nucleotidylyl transferaseFamily: Class I aminoacyl-tRNA synthetases (RS), catalytic domain
73 d2oy9a1 
 
not modelled 
8.1 
32 
Fold: BH2638-likeSuperfamily: BH2638-likeFamily: BH2638-like
74 c1h3eA_ 
 
not modelled 
8.1 
29 
PDB header: ligaseChain:  A: PDB Molecule: tyrosyl-trna synthetase;PDBTitle:  tyrosyl-trna synthetase from thermus thermophilus complexed with wild-2 type trnatyr(gua) and with atp and tyrosinol
75 d1qipa_ 
 
not modelled 
8.0 
30 
Fold: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseSuperfamily: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseFamily: Glyoxalase I (lactoylglutathione lyase)
76 c4ovmE_ 
 
not modelled 
8.0 
17 
PDB header: unknown functionChain:  E: PDB Molecule: uncharacterized protein sgcj;PDBTitle:  crystal structure of sgcj protein from streptomyces carzinostaticus
77 c1h3oA_ 
 
not modelled 
8.0 
31 
PDB header: transcription/tbp-associated factorsChain:  A: PDB Molecule: transcription initiation factor tfiid 135 kda subunit;PDBTitle:  crystal structure of the human taf4-taf12 (tafii135-tafii20) complex
78 d1h3oa_ 
 
not modelled 
8.0 
31 
Fold: Histone-foldSuperfamily: Histone-foldFamily: TBP-associated factors, TAFs
79 c4rt5A_ 
 
not modelled 
7.9 
36 
PDB header: oxidoreductaseChain:  A: PDB Molecule: glyoxalase/bleomycin resistance protein/dioxygenase;PDBTitle:  the crystal structure of a glyoxalase/bleomycin resistance2 protein/dioxygenase protein from planctomyces limnophilus dsm 3776
80 c2m45A_ 
 
not modelled 
7.9 
8 
PDB header: hydrolaseChain:  A: PDB Molecule: minichromosome maintenance protein mcm;PDBTitle:  nmr solution structure of the c-terminus of the minichromosome2 maintenance protein mcm from sulfolobus solfataricus
81 c2kjzA_ 
 
not modelled 
7.6 
18 
PDB header: unknown functionChain:  A: PDB Molecule: atc0852;PDBTitle:  solution nmr structure of protein atc0852 from agrobacterium2 tumefaciens. northeast structural genomics consortium (nesg) target3 att2.
82 c6a52A_ 
 
not modelled 
7.6 
25 
PDB header: biosynthetic proteinChain:  A: PDB Molecule: dioxidase chap-h1;PDBTitle:  oxidase chap-h1
83 c1yn3A_ 
 
not modelled 
7.5 
25 
PDB header: toxin, protein bindingChain:  A: PDB Molecule: truncated cell surface protein map-w;PDBTitle:  crystal structures of eap domains from staphylococcus2 aureus reveal an unexpected homology to bacterial3 superantigens
84 c4bbaA_ 
 
not modelled 
7.5 
15 
PDB header: protein-binding proteinChain:  A: PDB Molecule: glucokinase regulatory protein;PDBTitle:  crystal structure of glucokinase regulatory protein complexed to2 phosphate
85 d1qgpa_ 
 
not modelled 
7.5 
13 
Fold: DNA/RNA-binding 3-helical bundleSuperfamily: "Winged helix" DNA-binding domainFamily: Z-DNA binding domain
86 c1yn4A_ 
 
not modelled 
7.4 
13 
PDB header: unknown functionChain:  A: PDB Molecule: eaph1;PDBTitle:  crystal structures of eap domains from staphylococcus2 aureus reveal an unexpected homology to bacterial3 superantigens
87 c5ijxA_ 
 
not modelled 
7.4 
25 
PDB header: ligaseChain:  A: PDB Molecule: tyrosine--trna ligase, mitochondrial;PDBTitle:  crystal structure of a c-terminally truncated coccidioides posadasii2 mitochondrial tyrosyl-trna synthetase
88 c3a05A_ 
 
not modelled 
7.4 
22 
PDB header: ligaseChain:  A: PDB Molecule: tryptophanyl-trna synthetase;PDBTitle:  crystal structure of tryptophanyl-trna synthetase from2 hyperthermophilic archaeon, aeropyrum pernix k1 complex3 with tryptophan
89 c6otjA_ 
 
not modelled 
7.3 
31 
PDB header: ligaseChain:  A: PDB Molecule: tyrosine--trna ligase;PDBTitle:  crystal structure of tyrosyl-trna synthetase from neisseria2 gonorrhoeae with bound l-tyr
90 d1hkxa_ 
 
not modelled 
7.3 
17 
Fold: Cystatin-likeSuperfamily: NTF2-likeFamily: Association domain of calcium/calmodulin-dependent protein kinase type II alpha subunit, CAMK2A
91 d1id3b_ 
 
not modelled 
7.2 
9 
Fold: Histone-foldSuperfamily: Histone-foldFamily: Nucleosome core histones
92 d2j0pa1 
 
not modelled 
7.0 
24 
Fold: Heme iron utilization protein-likeSuperfamily: Heme iron utilization protein-likeFamily: HemS/ChuS-like
93 c3r4qB_ 
 
not modelled 
7.0 
30 
PDB header: lyaseChain:  B: PDB Molecule: lactoylglutathione lyase;PDBTitle:  crystal structure of lactoylglutathione lyase from agrobacterium2 tumefaciens
94 c3ff5B_ 
 
not modelled 
6.9 
24 
PDB header: protein transportChain:  B: PDB Molecule: peroxisomal biogenesis factor 14;PDBTitle:  crystal structure of the conserved n-terminal domain of the2 peroxisomal matrix-protein-import receptor, pex14p
95 c4z04A_ 
 
not modelled 
6.8 
40 
PDB header: lyaseChain:  A: PDB Molecule: glyoxalase/bleomycin resistance /dioxygenase superfamilyPDBTitle:  crystal structure of a probable lactoylglutathione lyase from brucella2 melitensis in complex with glutathione
96 d1ecsa_ 
 
not modelled 
6.7 
50 
Fold: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseSuperfamily: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenaseFamily: Antibiotic resistance proteins
97 d1jx4a1 
 
not modelled 
6.7 
24 
Fold: Lesion bypass DNA polymerase (Y-family), little finger domainSuperfamily: Lesion bypass DNA polymerase (Y-family), little finger domainFamily: Lesion bypass DNA polymerase (Y-family), little finger domain
98 c3h51A_ 
 
not modelled 
6.7 
22 
PDB header: protein bindingChain:  A: PDB Molecule: putative calcium/calmodulin dependent protein kinase iiPDBTitle:  crystal structure of putative calcium/calmodulin dependent protein2 kinase ii association domain (np_636218.1) from xanthomonas3 campestris at 1.70 a resolution
99 c2qh0A_ 
 
not modelled 
6.6 
30 
PDB header: lyaseChain:  A: PDB Molecule: lactoylglutathione lyase;PDBTitle:  crystal structure of a glyoxalase from clostridium acetobutylicum