1cxh
From Proteopedia
| Line 1: | Line 1: | ||
| - | [[Image:1cxh.gif|left|200px]] | + | [[Image:1cxh.gif|left|200px]] |
| - | + | ||
| - | '''COMPLEX OF CGTASE WITH MALTOTETRAOSE AT ROOM TEMPERATURE AND PH 9.6 BASED ON DIFFRACTION DATA OF A CRYSTAL SOAKED WITH MALTOHEPTAOSE''' | + | {{Structure |
| + | |PDB= 1cxh |SIZE=350|CAPTION= <scene name='initialview01'>1cxh</scene>, resolution 2.41Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=MAL:MALTOSE'>MAL</scene> and <scene name='pdbligand=CA:CALCIUM ION'>CA</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Cyclomaltodextrin_glucanotransferase Cyclomaltodextrin glucanotransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.1.19 2.4.1.19] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''COMPLEX OF CGTASE WITH MALTOTETRAOSE AT ROOM TEMPERATURE AND PH 9.6 BASED ON DIFFRACTION DATA OF A CRYSTAL SOAKED WITH MALTOHEPTAOSE''' | ||
| + | |||
==Overview== | ==Overview== | ||
| Line 7: | Line 16: | ||
==About this Structure== | ==About this Structure== | ||
| - | 1CXH is a [ | + | 1CXH is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_circulans Bacillus circulans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CXH OCA]. |
==Reference== | ==Reference== | ||
| - | Crystallographic studies of the interaction of cyclodextrin glycosyltransferase from Bacillus circulans strain 251 with natural substrates and products., Knegtel RM, Strokopytov B, Penninga D, Faber OG, Rozeboom HJ, Kalk KH, Dijkhuizen L, Dijkstra BW, J Biol Chem. 1995 Dec 8;270(49):29256-64. PMID:[http:// | + | Crystallographic studies of the interaction of cyclodextrin glycosyltransferase from Bacillus circulans strain 251 with natural substrates and products., Knegtel RM, Strokopytov B, Penninga D, Faber OG, Rozeboom HJ, Kalk KH, Dijkhuizen L, Dijkstra BW, J Biol Chem. 1995 Dec 8;270(49):29256-64. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/7493956 7493956] |
[[Category: Bacillus circulans]] | [[Category: Bacillus circulans]] | ||
[[Category: Cyclomaltodextrin glucanotransferase]] | [[Category: Cyclomaltodextrin glucanotransferase]] | ||
| Line 21: | Line 30: | ||
[[Category: glycosyltransferase]] | [[Category: glycosyltransferase]] | ||
| - | ''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 10:30:07 2008'' |
Revision as of 08:30, 20 March 2008
| |||||||
| , resolution 2.41Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | and | ||||||
| Activity: | Cyclomaltodextrin glucanotransferase, with EC number 2.4.1.19 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
COMPLEX OF CGTASE WITH MALTOTETRAOSE AT ROOM TEMPERATURE AND PH 9.6 BASED ON DIFFRACTION DATA OF A CRYSTAL SOAKED WITH MALTOHEPTAOSE
Overview
Asp-229, Glu-257, and Asp-328 constitute the catalytic residues in cyclodextrin glycosyl transferase from Bacillus circulans strain 251. Via site-directed mutagenesis constructed D229N, E257Q, and D328N mutant proteins showed a 4,000-60,000-fold reduction of cyclization activity. A D229N/E257Q double mutant showed a 700,000-fold reduction and was crystallized for use in soaking experiments with alpha-cyclodextrin. Crystal structures were determined of wild type CGTase soaked at elevated pH with alpha-cyclodextrin (resolution, 2.1 A) and maltoheptaose (2.4 A). In addition, structures at cryogenic temperature were solved of the unliganded enzyme (2.2 A) and of the D229N/E257Q mutant after soaking with alpha-cyclodextrin (2.6 A). In the crystals soaked in alpha-cyclodextrin and maltoheptaose, a maltotetraose molecule is observed to bind in the active site. Residue 229 is at hydrogen bonding distance from the C-6 hydroxyl group of the sugar, which after cleavage will contain the new reducing end. In the D229N/E257Q double mutant structure, two alpha-cyclodextrins are observed to replace two maltoses at the E-domain, thus providing structural information on product inhibition via binding to the enzyme's raw starch binding domain.
About this Structure
1CXH is a Single protein structure of sequence from Bacillus circulans. Full crystallographic information is available from OCA.
Reference
Crystallographic studies of the interaction of cyclodextrin glycosyltransferase from Bacillus circulans strain 251 with natural substrates and products., Knegtel RM, Strokopytov B, Penninga D, Faber OG, Rozeboom HJ, Kalk KH, Dijkhuizen L, Dijkstra BW, J Biol Chem. 1995 Dec 8;270(49):29256-64. PMID:7493956
Page seeded by OCA on Thu Mar 20 10:30:07 2008
