Glycoside Hydrolase Family 84

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• Author: ^^^Ian Greig^^^
• Responsible Curator: ^^^David Vocadlo^^^

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Glycoside Hydrolase Family GH84
Clan	none
Mechanism	retaining
Active site residues	known
CAZy DB link
http://www.cazy.org/GH84.html

Substrate specificities

Content is to be added here.

This is an example of how to make references to a journal article [1]. (See the References section below). Multiple references can go in the same place like this [1, 2]. You can even cite books using just the ISBN [3]. References that are not in PubMed can be typed in by hand [4].

Kinetics and Mechanism

The most extensive kinetic studies have been carried out on Human O-GlcNAcase. Neighbouring group participation.[5] Substrate distortion.[6, 7] General acid catalysis operative for substrates possessing leaving groups with pKas greater than approximately XXX. For either O- or S-glycosides possessing leaving groups with pKas below XXX the leaving group will depart at the anion.[6, 8] Nuclear isoform (TRUNCATION) of Human O-GlcNAcase retains similar kinetic properties and inhibitory patterns as the cytosolic isoform consistent with hexosaminidase activity residing in the XXX domains.[9]

Catalytic Residues

[10]

Three-dimensional structures

Content is to be added here.[11, 12]

Family Firsts

First sterochemistry determination

Cite some reference here, with a short (1-2 sentence) explanation [1].

First catalytic nucleophile identification

Cite some reference here, with a short (1-2 sentence) explanation [4].

First general acid/base residue identification

Cite some reference here, with a short (1-2 sentence) explanation [2].

First 3-D structure

Cite some reference here, with a short (1-2 sentence) explanation [3].

References

1. Comfort DA, Bobrov KS, Ivanen DR, Shabalin KA, Harris JM, Kulminskaya AA, Brumer H, and Kelly RM. (2007). Biochemical analysis of Thermotoga maritima GH36 alpha-galactosidase (TmGalA) confirms the mechanistic commonality of clan GH-D glycoside hydrolases. Biochemistry. 2007;46(11):3319-30. DOI:10.1021/bi061521n |
2. He S and Withers SG. (1997). Assignment of sweet almond beta-glucosidase as a family 1 glycosidase and identification of its active site nucleophile. J Biol Chem. 1997;272(40):24864-7. DOI:10.1074/jbc.272.40.24864 |

4. Sinnott, M.L. (1990) Catalytic mechanisms of enzymic glycosyl transfer. Chem. Rev. 90, 1171-1202. DOI: 10.1021/cr00105a006

5. Macauley MS, Whitworth GE, Debowski AW, Chin D, and Vocadlo DJ. (2005). O-GlcNAcase uses substrate-assisted catalysis: kinetic analysis and development of highly selective mechanism-inspired inhibitors. J Biol Chem. 2005;280(27):25313-22. DOI:10.1074/jbc.M413819200 |
6. Greig IR, Macauley MS, Williams IH, and Vocadlo DJ. (2009). Probing synergy between two catalytic strategies in the glycoside hydrolase O-GlcNAcase using multiple linear free energy relationships. J Am Chem Soc. 2009;131(37):13415-22. DOI:10.1021/ja904506u |
7. He Y, Macauley MS, Stubbs KA, Vocadlo DJ, and Davies GJ. (2010). Visualizing the reaction coordinate of an O-GlcNAc hydrolase. J Am Chem Soc. 2010;132(6):1807-9. DOI:10.1021/ja9086769 |
8. Macauley MS, Stubbs KA, and Vocadlo DJ. (2005). O-GlcNAcase catalyzes cleavage of thioglycosides without general acid catalysis. J Am Chem Soc. 2005;127(49):17202-3. DOI:10.1021/ja0567687 |
9. Macauley MS and Vocadlo DJ. (2009). Enzymatic characterization and inhibition of the nuclear variant of human O-GlcNAcase. Carbohydr Res. 2009;344(9):1079-84. DOI:10.1016/j.carres.2009.04.017 |

10. Cetinbaş N, Macauley MS, Stubbs KA, Drapala R, Vocadlo DJ. Identification of Asp174 and Asp175 as the key catalytic residues of human O-GlcNAcase by functional analysis of site-directed mutants. Biochemistry. 2006 Mar 21;45(11):3835-44. DOI:10.1021/bi052370b

11. Dennis RJ, Taylor EJ, Macauley MS, Stubbs KA, Turkenburg JP, Hart SJ, Black GN, Vocadlo DJ, and Davies GJ. (2006). Structure and mechanism of a bacterial beta-glucosaminidase having O-GlcNAcase activity. Nat Struct Mol Biol. 2006;13(4):365-71. DOI:10.1038/nsmb1079 |
12. Rao FV, Dorfmueller HC, Villa F, Allwood M, Eggleston IM, and van Aalten DM. (2006). Structural insights into the mechanism and inhibition of eukaryotic O-GlcNAc hydrolysis. EMBO J. 2006;25(7):1569-78. DOI:10.1038/sj.emboj.7601026 |