1a39
From Proteopedia
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|PDB= 1a39 |SIZE=350|CAPTION= <scene name='initialview01'>1a39</scene>, resolution 2.2Å | |PDB= 1a39 |SIZE=350|CAPTION= <scene name='initialview01'>1a39</scene>, resolution 2.2Å | ||
|SITE= <scene name='pdbsite=ACI:Catalytic+Acid/Base'>ACI</scene> and <scene name='pdbsite=NUC:Catalytic+Nucleophile+As+Identified+By+2-Fluorocellobios+...'>NUC</scene> | |SITE= <scene name='pdbsite=ACI:Catalytic+Acid/Base'>ACI</scene> and <scene name='pdbsite=NUC:Catalytic+Nucleophile+As+Identified+By+2-Fluorocellobios+...'>NUC</scene> | ||
| - | |LIGAND= <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene> | + | |LIGAND= <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PCA:PYROGLUTAMIC+ACID'>PCA</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] | + | |ACTIVITY= <span class='plainlinks'>[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] </span> |
|GENE= POTENTIAL ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=34413 Humicola insolens]) | |GENE= POTENTIAL ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=34413 Humicola insolens]) | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1a39 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1a39 OCA], [http://www.ebi.ac.uk/pdbsum/1a39 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1a39 RCSB]</span> | ||
}} | }} | ||
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[[Category: Lewis, R J.]] | [[Category: Lewis, R J.]] | ||
[[Category: Schulein, M.]] | [[Category: Schulein, M.]] | ||
| - | [[Category: NAG]] | ||
[[Category: cellulase]] | [[Category: cellulase]] | ||
[[Category: cellulose degradation]] | [[Category: cellulose degradation]] | ||
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[[Category: hydrolase]] | [[Category: hydrolase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 18:32:17 2008'' |
Revision as of 15:32, 30 March 2008
| |||||||
| , resolution 2.2Å | |||||||
|---|---|---|---|---|---|---|---|
| Sites: | and | ||||||
| Ligands: | , | ||||||
| Gene: | POTENTIAL (Humicola insolens) | ||||||
| Activity: | Cellulase, with EC number 3.2.1.4 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
HUMICOLA INSOLENS ENDOCELLULASE EGI S37W, P39W DOUBLE-MUTANT
Overview
Family 7 of the glycosyl hydrolases contains both endoglucanases and cellobiohydrolases. In addition to their different catalytic activities on crystalline substrates, the cellobiohydrolases differ from the endoglucanases in their activity on longer soluble substrates, indicative of a greater number of subsites on the enzyme. A double mutant (S37W, P39W) of the Humicola insolens endoglucanase I (EG I) has been constructed in order to mimic aspects of the subsite structure of the corresponding family 7 cellobiohydrolase, cellobiohydrolase-I (CBH I). The 3-D crystal structure of the double mutant has been solved and refined to a crystallographic R-factor of 0.17 at a resolution of 2.2 A (1 A = 0.1 nm). The two mutant tryptophans are clearly visible in the electron density and are in the same orientation as those found in the substrate binding groove of CBH I. In addition to the substitutions, the C-terminal amino acids (399QELQ), disordered in the native enzyme structure, are clearly visible and there are a small number of minor loop movements associated with differences in crystal packing. Kinetic determinations show that the S37W, P39W mutant EG I has almost identical activity, compared to native EG I, on small soluble cellodextrins. On phosphoric acid swollen cellulose there is a small (30%), but significant, decrease in the apparent KM indicating that the double mutant may indeed exhibit stronger binding to longer polymeric substrates.
About this Structure
1A39 is a Single protein structure of sequence from Humicola insolens. Full crystallographic information is available from OCA.
Reference
Oligosaccharide specificity of a family 7 endoglucanase: insertion of potential sugar-binding subsites., Davies GJ, Ducros V, Lewis RJ, Borchert TV, Schulein M, J Biotechnol. 1997 Sep 16;57(1-3):91-100. PMID:9335168
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