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Difference between revisions of "Glycoside Hydrolase Family 57"

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== Substrate specificities ==
 
== Substrate specificities ==
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    Normal  0        21        false  false  false      SK  X-NONE  X-NONE                                                    MicrosoftInternetExplorer4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    The family GH57 was established in 1996 (Henrissat & Bairoch 1996) based on the existence of the sequences of two “α-amylases” that were dissimilar to typical family GH13 α-amylases (MacGregor et al. 2001). The two were the heat-stable eubacterial amylase from Dictyoglomus thermophilum known from 1988 (Fukusumi et al. 1988) and the extremely thermostable archaeal amylase from Pyrococcus furiosus determined in 1993 (Laderman et al. 1993a).
  
This is an example of how to make references to a journal article. (See the References section below).  Multiple references can go in the same place like this. You can even cite books using just the ISBN. References that are not in PubMed can be typed in by hand.
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    Normal  0        21        false  false  false      SK  X-NONE  X-NONE                                                    MicrosoftInternetExplorer4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    The family has expanded mainly due to running genome sequencing projects. Nowadays it contains more than 400 members; all originating from prokaryotes (http://www.cazy.org/fam/GH57.html). With regard to the enzyme specificities, the family GH57 covers the α-amylase (EC 3.2.1.1), α-galactosidase (EC 3.2.1.22), amylopullulanase (EC 3.2.1.1/41), branching enzyme (EC 2.4.1.18) and 4-α-glucanotransferase (EC 2.4.1.25). It is worth mentioning that the two constituent members, i.e. the “α-amylases” from D. thermophilum and P. furiosus are rather the 4-α-glucanotransferases since the former was later proven to have the transglycosylating activity (Nakajima et al. 2004), whereas the latter was shown already in 1993 to exhibit the 4-α-glucanotransferase activity (Laderman et al., 1993b). And it is also of interest that the real enzymes form only about 5% of the family members. The vast majority of the GH57 are hypothetical proteins.
  
 
== Kinetics and Mechanism ==
 
== Kinetics and Mechanism ==

Revision as of 02:37, 13 January 2010

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This page is currently under construction. This means that the Responsible Curator has deemed that the page's content is not quite up to CAZypedia's standards for full public consumption. All information should be considered to be under revision and may be subject to major changes.

Glycoside Hydrolase Family GH57
Clan not assigned yet
Mechanism retaining
Active site residues known/not known
CAZy DB link
http://www.cazy.org/fam/GH57.html

Substrate specificities

    Normal   0         21         false   false   false      SK   X-NONE   X-NONE                                                     MicrosoftInternetExplorer4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     The family GH57 was established in 1996 (Henrissat & Bairoch 1996) based on the existence of the sequences of two “α-amylases” that were dissimilar to typical family GH13 α-amylases (MacGregor et al. 2001). The two were the heat-stable eubacterial amylase from Dictyoglomus thermophilum known from 1988 (Fukusumi et al. 1988) and the extremely thermostable archaeal amylase from Pyrococcus furiosus determined in 1993 (Laderman et al. 1993a).
    Normal   0         21         false   false   false      SK   X-NONE   X-NONE                                                     MicrosoftInternetExplorer4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     The family has expanded mainly due to running genome sequencing projects. Nowadays it contains more than 400 members; all originating from prokaryotes (http://www.cazy.org/fam/GH57.html). With regard to the enzyme specificities, the family GH57 covers the α-amylase (EC 3.2.1.1), α-galactosidase (EC 3.2.1.22), amylopullulanase (EC 3.2.1.1/41), branching enzyme (EC 2.4.1.18) and 4-α-glucanotransferase (EC 2.4.1.25). It is worth mentioning that the two constituent members, i.e. the “α-amylases” from D. thermophilum and P. furiosus are rather the 4-α-glucanotransferases since the former was later proven to have the transglycosylating activity (Nakajima et al. 2004), whereas the latter was shown already in 1993 to exhibit the 4-α-glucanotransferase activity (Laderman et al., 1993b). And it is also of interest that the real enzymes form only about 5% of the family members. The vast majority of the GH57 are hypothetical proteins.

Kinetics and Mechanism

Content is to be added here.

Catalytic Residues

Content is to be added here.

Three-dimensional structures

Content is to be added here.

Family Firsts

First sterochemistry determination
Cite some reference here, with a short (1-2 sentence) explanation.
First catalytic nucleophile identification
Cite some reference here, with a short (1-2 sentence) explanation.
First general acid/base residue identification
Cite some reference here, with a short (1-2 sentence) explanation.
First 3-D structure
The first 3-D structure of a GH57 member was that of the 4-alpha-glucanotransferase from Thermococcus litoralis [1].

References

  1. Imamura H, Fushinobu S, Yamamoto M, Kumasaka T, Jeon BS, Wakagi T, and Matsuzawa H. (2003) Crystal structures of 4-alpha-glucanotransferase from Thermococcus litoralis and its complex with an inhibitor. J Biol Chem. 278, 19378-86. DOI:10.1074/jbc.M213134200 | PubMed ID:12618437 | HubMed [Imamura2003]