3tf4: Difference between revisions
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[[Image:3tf4.jpg|left|200px]]< | [[Image:3tf4.jpg|left|200px]] | ||
'''ENDO/EXOCELLULASE:CELLOTRIOSE FROM THERMOMONOSPORA''' | {{Structure | ||
|PDB= 3tf4 |SIZE=350|CAPTION= <scene name='initialview01'>3tf4</scene>, resolution 2.2Å | |||
|SITE= <scene name='pdbsite=AA1:Active+Site'>AA1</scene>, <scene name='pdbsite=AB1:Active+Site'>AB1</scene>, <scene name='pdbsite=CA1:Ca+Binding+Site'>CA1</scene>, <scene name='pdbsite=CA2:Ca+Binding+Site'>CA2</scene>, <scene name='pdbsite=CA3:Ca+Binding+Site'>CA3</scene> and <scene name='pdbsite=CA4:Ca+Binding+Site'>CA4</scene> | |||
|LIGAND= <scene name='pdbligand=GLC:GLUCOSE'>GLC</scene> and <scene name='pdbligand=CA:CALCIUM ION'>CA</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Cellulase Cellulase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.4 3.2.1.4] | |||
|GENE= BAMH1-PST1 FRAGMENT OF T. FUSC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=2021 Thermobifida fusca]) | |||
}} | |||
'''ENDO/EXOCELLULASE:CELLOTRIOSE FROM THERMOMONOSPORA''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
3TF4 is a [ | 3TF4 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Thermobifida_fusca Thermobifida fusca]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3TF4 OCA]. | ||
==Reference== | ==Reference== | ||
Structure and mechanism of endo/exocellulase E4 from Thermomonospora fusca., Sakon J, Irwin D, Wilson DB, Karplus PA, Nat Struct Biol. 1997 Oct;4(10):810-8. PMID:[http:// | Structure and mechanism of endo/exocellulase E4 from Thermomonospora fusca., Sakon J, Irwin D, Wilson DB, Karplus PA, Nat Struct Biol. 1997 Oct;4(10):810-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9334746 9334746] | ||
[[Category: Cellulase]] | [[Category: Cellulase]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: glycosyl hydrolase]] | [[Category: glycosyl hydrolase]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 19:07:23 2008'' | ||
Revision as of 20:07, 20 March 2008
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| , resolution 2.2Å | |||||||
|---|---|---|---|---|---|---|---|
| Sites: | , , , , and | ||||||
| Ligands: | and | ||||||
| Gene: | BAMH1-PST1 FRAGMENT OF T. FUSC (Thermobifida fusca) | ||||||
| Activity: | Cellulase, with EC number 3.2.1.4 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
ENDO/EXOCELLULASE:CELLOTRIOSE FROM THERMOMONOSPORA
OverviewOverview
Cellulase E4 from Thermomonospora fusca is unusual in that it has characteristics of both exo- and endo-cellulases. Here we report the crystal structure of a 68K M(r) fragment of E4 (E4-68) at 1.9 A resolution. E4-68 contains both a family 9 catalytic domain, exhibiting an (alpha/alpha)6 barrel fold, and a family III cellulose binding domain, having an antiparallel beta-sandwich fold. While neither of these folds is novel, E4-68 provides the first cellulase structure having interacting catalytic and cellulose binding domains. The complexes of E4-68 with cellopentaose, cellotriose and cellobiose reveal conformational changes associated with ligand binding and allow us to propose a catalytic mechanism for family 9 enzymes. We also provide evidence that E4 has two novel characteristics: first it combines exo- and endo-activities and second, when it functions as an exo-cellulase, it cleaves off cellotetraose units.
About this StructureAbout this Structure
3TF4 is a Single protein structure of sequence from Thermobifida fusca. Full crystallographic information is available from OCA.
ReferenceReference
Structure and mechanism of endo/exocellulase E4 from Thermomonospora fusca., Sakon J, Irwin D, Wilson DB, Karplus PA, Nat Struct Biol. 1997 Oct;4(10):810-8. PMID:9334746
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