CAZypedia needs your help!
We have many unassigned pages in need of Authors and Responsible Curators. See a page that's out-of-date and just needs a touch-up? - You are also welcome to become a CAZypedian. Here's how.
Scientists at all career stages, including students, are welcome to contribute.
Learn more about CAZypedia's misson here and in this article.
Totally new to the CAZy classification? Read this first.
Difference between revisions of "Glycoside Hydrolase Family 49"
Line 32: | Line 32: | ||
== Kinetics and Mechanism == | == Kinetics and Mechanism == | ||
− | Family GH49 α-glycosidases are [[inverting]] enzymes, as first shown by NMR on a dextranase Dex49A from '' | + | Family GH49 α-glycosidases are [[inverting]] enzymes, as first shown by NMR on a dextranase Dex49A from ''Talaromyces minioluteum'' <cite>Larsson2003</cite> . |
== Catalytic Residues == | == Catalytic Residues == | ||
− | Three Asp residues (Asp376, Asp395, and Asp396 in Dex49A) are conserved in the catalytic centre of members of clan GH-N, GH49 and [[GH28]] enzymes <cite>Larsson2003 Mizuno2008</cite>, and all three of the Asp mutants of a GH49 enzyme, isopullulanase, lost their activities <cite>Akeboshi2004</cite>. The [[general acid]] was first identified in Dex49A from '' | + | Three Asp residues (Asp376, Asp395, and Asp396 in Dex49A) are conserved in the catalytic centre of members of clan GH-N, GH49 and [[GH28]] enzymes <cite>Larsson2003 Mizuno2008</cite>, and all three of the Asp mutants of a GH49 enzyme, isopullulanase, lost their activities <cite>Akeboshi2004</cite>. The [[general acid]] was first identified in Dex49A from ''Talaromyces minioluteum'' as Asp395 following the three-dimensional structure determination. To date, it is unclear whether either (or both) of the Asp residues (Asp376 and Asp396 in Dex49A) acts as a [[general base]] in the reaction of GH49 and [[GH28]] enzymes <cite>Larsson2003 vanSanten1999 Shimizu2002</cite>. |
== Three-dimensional structures == | == Three-dimensional structures == | ||
Line 42: | Line 42: | ||
== Family Firsts == | == Family Firsts == | ||
;First gene cloning: Dextranase from ''Arthrobacter'' sp. CB-8 <cite>Okushima1991</cite>. | ;First gene cloning: Dextranase from ''Arthrobacter'' sp. CB-8 <cite>Okushima1991</cite>. | ||
− | ;First sterochemistry determination: Dextranase (Dex49A) from '' | + | ;First sterochemistry determination: Dextranase (Dex49A) from ''Talaromyces minioluteum'' <cite>Larsson2003</cite>. |
− | ;First general acid residue identification: Dextranase (Dex49A) from '' | + | ;First general acid residue identification: Dextranase (Dex49A) from ''Talaromyces minioluteum'' <cite>Larsson2003</cite>. |
− | ;First 3-D structure: Dextranase (Dex49A) from '' | + | ;First 3-D structure: Dextranase (Dex49A) from ''Talaromyces minioluteum'' by X-ray crystallography (PDB ID [{{PDBlink}}1ogm 1ogm]) <cite>Larsson2003</cite>. |
== References == | == References == |
Latest revision as of 20:08, 13 April 2023
This page has been approved by the Responsible Curator as essentially complete. CAZypedia is a living document, so further improvement of this page is still possible. If you would like to suggest an addition or correction, please contact the page's Responsible Curator directly by e-mail.
Glycoside Hydrolase Family GH49 | |
Clan | GH-N |
Mechanism | inverting |
Active site residues | known |
CAZy DB link | |
http://www.cazy.org/GH49.html |
Substrate specificities
Glycoside hydrolases of family 49 cleave α-1,6-glucosidic linkages or α-1,4-glucosidic linkages of polysaccharides containing α-1,6-glucosidic linkages, dextran and pullulan. The major activities reported for this family of glycoside hydrolases are dextranase (EC 3.2.1.11), and a dextranase from Talaromyces minioluteum (formerly known as Penicillium minioluteum), Dex49A, is currently the most characterized enzyme. Dextran 1,6-α-isomaltotriosidase (EC 3.2.1.95) [1], isopullulanase (EC 3.2.1.57) [2], endo-acting sulfated-arabinan hydrolase (EC 3.2.1-) [3], and 4-O-α-D-isomaltooligosaccharylmaltooligosaccharide 1,4-α-isomaltooligosaccharohydrolase (EC 3.2.1.-) [4] have also been described.
Kinetics and Mechanism
Family GH49 α-glycosidases are inverting enzymes, as first shown by NMR on a dextranase Dex49A from Talaromyces minioluteum [5] .
Catalytic Residues
Three Asp residues (Asp376, Asp395, and Asp396 in Dex49A) are conserved in the catalytic centre of members of clan GH-N, GH49 and GH28 enzymes [5, 6], and all three of the Asp mutants of a GH49 enzyme, isopullulanase, lost their activities [7]. The general acid was first identified in Dex49A from Talaromyces minioluteum as Asp395 following the three-dimensional structure determination. To date, it is unclear whether either (or both) of the Asp residues (Asp376 and Asp396 in Dex49A) acts as a general base in the reaction of GH49 and GH28 enzymes [5, 8, 9].
Three-dimensional structures
Two structures of GH49 enzymes are available so far [5, 6], and they display a two domain structure. The N-terminal domain is a β-sandwich and the C-terminal domain adopts a right-handed parallel β-helix. The similarity of the β-helix fold between GH49 and GH28 enzymes has been described, although almost none of the amino acid residues other than the three catalytic Asp residues is conserved between the two families [5, 6]. Each coil forming the cylindrical β-helix fold is composed of three β-sheets, which are named PB1, PB2, and PB3, following the original definition for a PL1 enzyme, pectate lyase C [10].
Family Firsts
- First gene cloning
- Dextranase from Arthrobacter sp. CB-8 [11].
- First sterochemistry determination
- Dextranase (Dex49A) from Talaromyces minioluteum [5].
- First general acid residue identification
- Dextranase (Dex49A) from Talaromyces minioluteum [5].
- First 3-D structure
- Dextranase (Dex49A) from Talaromyces minioluteum by X-ray crystallography (PDB ID 1ogm) [5].
References
- Mizuno T, Mori H, Ito H, Matsui H, Kimura A, and Chiba S. (1999). Molecular cloning of isomaltotrio-dextranase gene from Brevibacterium fuscum var. dextranlyticum strain 0407 and its expression in Escherichia coli. Biosci Biotechnol Biochem. 1999;63(9):1582-8. DOI:10.1271/bbb.63.1582 |
-
Sakano Y, Masuda N, and Kobayashi T. (1971). Hydrolysis of Pullulan by a Novel Enzyme from Aspergillus niger, Agric Biol Chem 1971;35(6):971-973. https://doi.org/10.1271/bbb1961.35.971
- Helbert W, Poulet L, Drouillard S, Mathieu S, Loiodice M, Couturier M, Lombard V, Terrapon N, Turchetto J, Vincentelli R, and Henrissat B. (2019). Discovery of novel carbohydrate-active enzymes through the rational exploration of the protein sequences space. Proc Natl Acad Sci U S A. 2019;116(13):6063-6068. DOI:10.1073/pnas.1815791116 |
- Kitagawa N, Watanabe H, Mori T, Aga H, Ushio S, and Yamamoto K. (2023). Cloning and sequence analysis of 4-O-α-d-isomaltooligosaccharylmaltooligosaccharide 1,4-α-isomaltooligosaccharohydrolase from Sarocladium kiliense U4520. Biosci Biotechnol Biochem. 2023;87(3):330-337. DOI:10.1093/bbb/zbac211 |
- Larsson AM, Andersson R, Ståhlberg J, Kenne L, and Jones TA. (2003). Dextranase from Penicillium minioluteum: reaction course, crystal structure, and product complex. Structure. 2003;11(9):1111-21. DOI:10.1016/s0969-2126(03)00147-3 |
- Mizuno M, Koide A, Yamamura A, Akeboshi H, Yoshida H, Kamitori S, Sakano Y, Nishikawa A, and Tonozuka T. (2008). Crystal structure of Aspergillus niger isopullulanase, a member of glycoside hydrolase family 49. J Mol Biol. 2008;376(1):210-20. DOI:10.1016/j.jmb.2007.11.098 |
- Akeboshi H, Tonozuka T, Furukawa T, Ichikawa K, Aoki H, Shimonishi A, Nishikawa A, and Sakano Y. (2004). Insights into the reaction mechanism of glycosyl hydrolase family 49. Site-directed mutagenesis and substrate preference of isopullulanase. Eur J Biochem. 2004;271(22):4420-7. DOI:10.1111/j.1432-1033.2004.04378.x |
- van Santen Y, Benen JA, Schröter KH, Kalk KH, Armand S, Visser J, and Dijkstra BW. (1999). 1.68-A crystal structure of endopolygalacturonase II from Aspergillus niger and identification of active site residues by site-directed mutagenesis. J Biol Chem. 1999;274(43):30474-80. DOI:10.1074/jbc.274.43.30474 |
- Shimizu T, Nakatsu T, Miyairi K, Okuno T, and Kato H. (2002). Active-site architecture of endopolygalacturonase I from Stereum purpureum revealed by crystal structures in native and ligand-bound forms at atomic resolution. Biochemistry. 2002;41(21):6651-9. DOI:10.1021/bi025541a |
- Yoder MD, Keen NT, and Jurnak F. (1993). New domain motif: the structure of pectate lyase C, a secreted plant virulence factor. Science. 1993;260(5113):1503-7. DOI:10.1126/science.8502994 |
- Okushima M, Sugino D, Kouno Y, Nakano S, Miyahara J, Toda H, Kubo S, and Matsushiro A. (1991). Molecular cloning and nucleotide sequencing of the Arthrobacter dextranase gene and its expression in Escherichia coli and Streptococcus sanguis. Jpn J Genet. 1991;66(2):173-87. DOI:10.1266/jjg.66.173 |