Activities in Family	sialidase or neuraminidase (EC 3.2.1.18); trans-sialidase (EC 2.4.1.-); anhydrosialidase (EC 4.2.2.15); Kdo hydrolase (EC 3.2.1.124); 2-keto-3-deoxynononic acid hydrolase / KDNase (EC 3.2.1.-)
Mechanism	Retaining
Clan	GH-E
3D Structure Status	6-fold β-propeller
Catalytic Nucleophile/Base	Tyr+Glu
Catalytic Proton Donor	Not known
External resources	HOMSTRAD;
Commercial Enzyme Provider(s)	MEGAZYME;
Statistics	GenBank accession (8857); Uniprot accession (133); PDB accession (172); 3D entries (25); cryst (0)

Bacteria
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)
sialidase (Hz136)	3.2.1.18	Alistipes sp.			6MNJ[B] 2.20 6MNJ[A] 2.20
E5356_01515		Bacteroides acidifaciens NM70_E10	TGY08465.1		7MHU[A] 2.00
BACCAC_01090 (23295)		Bacteroides caccae ATCC 43185	ZP_01959484.1		4Q6K[A,B,C,D] 1.90
sialidase (BtsA;BTSA;BT0455)	3.2.1.18	Bacteroides thetaiotaomicron VPI-5482	AAO75562.1 NP_809368.1 WP_008766031.1	Q8AAK9	4BBW[A] 2.30
sialidase (CpNanI;CPF_0721)	3.2.1.18	Clostridium perfringens ATCC 13124	ABG83208.1	A0A0H2YQR1 Q0TT67	4L2E[A] 1.90 5TSP[A,B] 1.24
exo-α-sialidase (NanI;CPSA;CPE0725)	3.2.1.18	Clostridium perfringens str. 13	BAB80431.1 NP_561641.1	Q59310 Q8XMG4	2BF6[A] α-D-Neup5Ac 0.97 2VK5[A] 0.97 2VK6[A] <carb_like_DAN> 1.50 2VK7[A,B] α-L-Manp3F5Ac-(2-0)-TYR 1.2
sialidase (PPA1560)	3.2.1.18	Cutibacterium acnes KPA171202	AAT83304.1		7LBU[A] 2.11 7LBV[A] <carb_like_DAN> 1.70
sialidase (NedA)	3.2.1.18	Micromonospora viridifaciens	BAA00852.1 AAQ70871.1	Q02834	1EUR[A] 1.82 1EUS[A] <carb_like_DAN> 2.00 1EUT[A] 2.50 1EUU[A] β-D-Galp 2.50 1W8N[A] β-D-Galp <carb_like_DAN> 2.1 1W8O[A] β-D-Galp-(1-4)-α-D-Glcp 1.70 1WCQ[A,B,C] <carb_like_DAN> 2.1 2BER[A] β-D-Neup5Ac 1.8 2BQ9[A,B,C] β-D-Galp 2.00 2BZD[A,B,C] β-D-Galp 2.0 4J9T[A] 1.40
BDI_2946		Parabacteroides distasonis ATCC 8503	ABR44654.1		4FJ6[A] 1.90
anhydrosialidase (RgNanH;HMPREF1201_01421) (intramolecular)	4.2.2.15	Ruminococcus gnavus	ETD19277.1	A7B557	4X47[A] <carb_like_DAN> 2.00 4X49[A] <carb_like_G39> 2.01 4X4A[A] 1.71 4X6K[A] 1.94
sialidase (NanH;STSA)	3.2.1.18	Salmonella enterica LT2	AMG28514.2	P29768	1DIL[A] D-1,2,3,4-deoxy-Xylp <carb_like_AXP> 1.90 1DIM[A] 1.60 2SIL[A] 1.60 2SIM[A] <carb_like_DAN> 1.60 3SIL[A] 1.05 6TRG[XXX] 6TVI[AAA] 7AEY[AAA] 7AF2[AAA]
sialidase A (NanA)	3.2.1.18	Streptococcus pneumoniae 6	CAA51473.1 ACJ76903.1	B8XTT3 P62575 Q59959	5KKY[A,B] 2.39 7A54[A] <carb_like_DAN> 2.70 7A5X[A] 1.94
neuraminidase (NanC)	3.2.1.18	Streptococcus pneumoniae G54	ACF56230.1	A0A0B7LH44 A0A0H2UQE4 A0A182DW00 B5E561	4YW0[A,B] 2.05 4YW1[A,B] α-D-Neup5Ac <carb_like_DAN> 2.25 4YW2[A,B] α-D-Neup5Ac-(2-6)-β-D-Galp 2.00 4YW3[A,B] α-D-Neup5Ac <carb_like_DAN> 2.05 4YW4[A,B] 2.20 4YW5[A,B] <carb_like_G39> 2.30 4YZ1[A,B] 1.97 4YZ2[A,B] <carb_like_DAN> 2.06 4YZ3[A,B] <carb_like_G39> 2.38 4YZ4[A,B] α-D-Neup5Ac 2.15 4YZ5[A,B] α-D-Neup5Ac-(2-3)-β-D-Galp <carb_like_DAN> 2.27 5F9T[A,B] α-L-Manp3F5Ac-(2-0)-TYR 2.05
neuraminidase (NanC)	3.2.1.18	Streptococcus pneumoniae G54	ACF56230.1	A0A0B7LH44 A0A0H2UQE4 A0A182DW00 B5E561	4YW0[A,B] 2.05 4YW1[A,B] α-D-Neup5Ac <carb_like_DAN> 2.25 4YW2[A,B] α-D-Neup5Ac-(2-6)-β-D-Galp 2.00 4YW3[A,B] α-D-Neup5Ac <carb_like_DAN> 2.05 4YW4[A,B] 2.20 4YW5[A,B] <carb_like_G39> 2.30 4YZ1[A,B] 1.97 4YZ2[A,B] <carb_like_DAN> 2.06 4YZ3[A,B] <carb_like_G39> 2.38 4YZ4[A,B] α-D-Neup5Ac 2.15 4YZ5[A,B] α-D-Neup5Ac-(2-3)-β-D-Galp <carb_like_DAN> 2.27 5F9T[A,B] α-L-Manp3F5Ac-(2-0)-TYR 2.05
sialidase A (NanA)		Streptococcus pneumoniae R6	AAL00340.1 ACJ76904.1 NP_359129.1		2VVZ[A,B] <carb_like_DAN> 2.5 2W20[A,B] 1.49 3H71[A,B] 1.70 3H72[A,B] α-D-Neup5Ac 1.70 3H73[A,B] <carb_like_DAN> 1.70
intramolecular trans-sialidase B (NanB;SP_1687)	4.2.2.15	Streptococcus pneumoniae TIGR4	AAK75766.1 NP_346126.1	Q54727	2JKB[A] 1.54 2VW0[A] 2.3 2VW1[A] <carb_like_DAN> 2.39 2VW2[A] 1.7 4FOQ[A] 1.99 4FOV[A] 2.29 4FOW[A] 2.10 4FOY[A] 1.84 4FP2[A] 2.05 4FP3[A] 2.74 4FPC[A] 2.32 4FPE[A] 2.18 4FPF[A] 2.23 4FPG[A] 2.58 4FPH[A] 1.94 4FPJ[A] 1.98 4FPK[A] 2.40 4FPL[A] 2.10 4FPO[B] 2.59 4FPY[A] 2.18 4FQ4[A] 1.84 4XE9[A] 1.84 4XHB[A] 1.88 4XHX[A] 2.10 4XIK[A] 1.91 4XIL[A] 1.90 4XIO[A] 1.80 4XJ8[A] 2.75 4XJ9[A] 1.98 4XJA[A] 1.98 4XJU[A] 1.94 4XJW[A] 1.53 4XJZ[A] 1.56 4XMA[A] 2.09 4XMI[A] 1.97 4XOG[A] <carb_like_DAN> 2.09 4XYX[A] 2.10
intramolecular trans-sialidase B (NanB;SP_1687)	4.2.2.15	Streptococcus pneumoniae TIGR4	AAK75766.1 NP_346126.1	Q54727	2JKB[A] 1.54 2VW0[A] 2.3 2VW1[A] <carb_like_DAN> 2.39 2VW2[A] 1.7 4FOQ[A] 1.99 4FOV[A] 2.29 4FOW[A] 2.10 4FOY[A] 1.84 4FP2[A] 2.05 4FP3[A] 2.74 4FPC[A] 2.32 4FPE[A] 2.18 4FPF[A] 2.23 4FPG[A] 2.58 4FPH[A] 1.94 4FPJ[A] 1.98 4FPK[A] 2.40 4FPL[A] 2.10 4FPO[B] 2.59 4FPY[A] 2.18 4FQ4[A] 1.84 4XE9[A] 1.84 4XHB[A] 1.88 4XHX[A] 2.10 4XIK[A] 1.91 4XIL[A] 1.90 4XIO[A] 1.80 4XJ8[A] 2.75 4XJ9[A] 1.98 4XJA[A] 1.98 4XJU[A] 1.94 4XJW[A] 1.53 4XJZ[A] 1.56 4XMA[A] 2.09 4XMI[A] 1.97 4XOG[A] <carb_like_DAN> 2.09 4XYX[A] 2.10
neuraminidase (NanA;SpneT_02001817)		Streptococcus pneumoniae TIGR4	ZP_01407762.1		2YA4[A,B] 1.80 2YA5[A,B] α-D-Neup5Ac 2.00 2YA6[A,B] <carb_like_DAN> 2.00 2YA7[A,B,C,D] <carb_like_ZMR> 1.89 2YA8[A,B] <carb_like_G39> 1.75
Sialidase26		unidentified bacterium			6MRV[A] <carb_like_DAN> 1.80 6MRX[A,B,C,D] 2.00 6MYV[A,B,C,D] 2.20 6MRV[B] <carb_like_DAN> 1.80
sialidase / neuraminidase (NanH;VcNA;VCSA)	3.2.1.18	Vibrio cholerae 569B 395	AAA27546.1	A5F7A4 P0C6E9 P37060	1KIT[A] 2.30 1W0O[A] α-D-Neup5Ac <carb_like_DAN> 1.9 1W0P[A] α-D-Neup5Ac 1.6 6EKS[A] <carb_like_G39> 1.87 6EKU[A] <carb_like_ZMR> 1.75
sialidase / neuraminidase (NanH;VcNA;VCSA)	3.2.1.18	Vibrio cholerae 569B 395	AAA27546.1	A5F7A4 P0C6E9 P37060	1KIT[A] 2.30 1W0O[A] α-D-Neup5Ac <carb_like_DAN> 1.9 1W0P[A] α-D-Neup5Ac 1.6 6EKS[A] <carb_like_G39> 1.87 6EKU[A] <carb_like_ZMR> 1.75
Eukaryota
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)
2-keto-3-deoxynononic acid sialidase (KDNase;AfKDNase;Afu4g13800;AFUA_4G13800) (6407)	3.2.1.18 3.2.1.-	Aspergillus fumigatus Af293	EAL89414.2	Q4WQS0	2XCY[A,B] 1.84 2XZI[A,B] α-D-Neup 1.45 2XZJ[A,B] 1.84 2XZK[A,B] α-L-Manp3F-(2-0)-TYR <carb_like_K99> 1.50 4M4N[A,B] 1.84 4M4U[A,B] 1.84 4M4V[A,B] <carb_like_DAN> 1.84
KDNase (ATEG_04964)	3.2.1.-	Aspergillus terreus NIH2624	Q0CMX0		7P1B[A] 1.45 7P1D[A] α-D-Neup 1.69 7P1E[A] α-L-Manp3F-(2-0)-TYR <carb_like_K99> 1.53 7P1F[A] 1.45 7P1O[A] α-D-Neup 1.60
sialidase (Neu2) (cytosolic)	3.2.1.18	Homo sapiens	CAB41449.1 AAH69151.1 AAI07054.1 AAY24360.1 NP_005374.1	Q9Y3R4	1SNT[A] 1.75 1SO7[A] 1.49 1VCU[A,B] <carb_like_DAN> 2.85 2F0Z[A] <carb_like_ZMR> 2.80 2F10[A] <carb_like_BCZ> 2.90 2F11[A] β-D-4-deoxy-GlcpANAc-(1-1)-<non_carb> 2.57 2F12[A] β-D-4-deoxy-GlcpANAc-(1-1)-<non_carb> 2.27 2F13[A] α-L-4-deoxy-IdopANAc-(1-1)-<non_carb> 2.26 2F24[A] 1.76 2F25[A,B] <carb_like_DAN> 1.95 2F26[A] 1.58 2F27[A,B] <carb_like_DAN> 2.15 2F28[A] 1.67 2F29[A,B] <carb_like_DAN> 2.92 4NC5[A] α-L-Manp3F5Ac-(2-0)-TYR 2.51 4NCS[A] α-L-Glcp3F5Ac-(2-0)-TYR 2.20
intramolecular trans-sialidase L (MDSA)	4.2.2.15	Macrobdella decora	AAC47263.1	Q27701	1SLI[A] <carb_like_DAN> 2.00 1SLL[A] 2.00 2SLI[A] 1.80 3SLI[A] 1.80 4SLI[A] <carb_like_CNP> 1.80
intramolecular trans-sialidase L (MDSA)	4.2.2.15	Macrobdella decora	AAC47263.1	Q27701	1SLI[A] <carb_like_DAN> 2.00 1SLL[A] 2.00 2SLI[A] 1.80 3SLI[A] 1.80 4SLI[A] <carb_like_CNP> 1.80
KDNase	3.2.1.-	Trichophyton rubrum CMCC(F)T1i	OAL63013.1		7P1Q[A] α-D-Neup 0.91 7P1R[A] α-L-Manp3F-(2-0)-TYR 1.75 7P1S[A] 1.92 7P1U[A] α-D-Neup 0.99 7P1V[A] 1.47
trans-sialidase (TcTS)	2.4.1.-	Trypanosoma cruzi	AAA66352.1 AAO30670.1 AAT21542.1	Q26966	1MR5[A] 2.25 1MS0[A,B] β-D-Galp-(1-4)-α-D-Glcp <carb_like_DAN> 2.50 1MS1[A,B] <carb_like_DAN> 1.80 1MS3[A,B] 1.65 1MS4[A,B] 2.21 1MS5[A,B] 2.00 1MS8[A,B] <carb_like_DAN> 2.00 1MS9[A,B] β-D-Galp-(1-4)-β-D-Glcp 1.58 1S0I[A] α-D-Neup5Ac-(2-3)-β-D-Galp-(1-4)-α-D-Glcp 1.60 1S0J[A] α-D-Neup5Ac-(2-1)-<non_carb> 1.65 1S0K[A] α-L-Manp3F5Ac-(2-0)-TYR 1.60 2AH2[A] α-L-Manp3F5Ac-(2-0)-TYR 1.60 3B69[A] α-L-Manp3F5Ac9N-(2-0)-TYR 1.67 3OPZ[A,B,C,M] 3.40 3PJQ[A] β-D-Galp-(1-4)-α-D-Glcp 2.10
sialidase (TrSA)	3.2.1.18	Trypanosoma rangeli	AAC95493.1 AAC95494.1 AAC95495.1	O44049 Q7JNE5 Q7JNE6	1MZ5[A] 2.20 1MZ6[A] <carb_like_DAN> 2.90 1N1S[A] 1.64 1N1T[A] <carb_like_DAN> 1.60 1N1V[A] <carb_like_DAN> 2.10 1N1Y[A] α-D-Neup5Ac 2.80 1WCS[A] 2.8 2A75[A] α-L-Manp3F5Ac-(2-0)-TYR 1.95 2AGS[A] α-L-Manp3F-(2-0)-TYR 1.70 2FHR[A] α-L-Manp3F5Ac-(2-0)-TYR 2.20
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