|
|
| Line 3: |
Line 3: |
| | <StructureSection load='4kca' size='340' side='right'caption='[[4kca]], [[Resolution|resolution]] 1.90Å' scene=''> | | <StructureSection load='4kca' size='340' side='right'caption='[[4kca]], [[Resolution|resolution]] 1.90Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4kca]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Bovin Bovin]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4KCA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4KCA FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4kca]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4KCA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4KCA FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=IOD:IODIDE+ION'>IOD</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=IOD:IODIDE+ION'>IOD</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4kc7|4kc7]], [[4kc8|4kc8]], [[4kcb|4kcb]]</td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4kca FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kca OCA], [https://pdbe.org/4kca PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4kca RCSB], [https://www.ebi.ac.uk/pdbsum/4kca PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4kca ProSAT]</span></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Arabinan_endo-1,5-alpha-L-arabinosidase Arabinan endo-1,5-alpha-L-arabinosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.99 3.2.1.99] </span></td></tr>
| + | |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4kca FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kca OCA], [http://pdbe.org/4kca PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4kca RCSB], [http://www.ebi.ac.uk/pdbsum/4kca PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4kca ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| Line 25: |
Line 23: |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Arabinan endo-1,5-alpha-L-arabinosidase]] | + | [[Category: Bos taurus]] |
| - | [[Category: Bovin]]
| + | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Costa, M C.M F]] | + | [[Category: Costa MCMF]] |
| - | [[Category: Murakami, M T]] | + | [[Category: Murakami MT]] |
| - | [[Category: Nascimento, A F.Z]] | + | [[Category: Nascimento AFZ]] |
| - | [[Category: Polo, C C]] | + | [[Category: Polo CC]] |
| - | [[Category: Santos, C R]] | + | [[Category: Santos CR]] |
| - | [[Category: Wong, D W.S]] | + | [[Category: Wong DWS]] |
| - | [[Category: Arabinanase]]
| + | |
| - | [[Category: Beta-propeller]]
| + | |
| - | [[Category: Gh43]]
| + | |
| - | [[Category: Glycoside hydrolase]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| Structural highlights
Publication Abstract from PubMed
Arabinanases (ABNs, EC 3.2.1.99) are promising catalysts for environmental friendly biomass conversion into energy and chemicals. These enzymes catalyze the hydrolysis of the alpha-1,5-linked L-arabinofuranoside backbone of plant cell wall arabinans releasing arabino-oligosaccharides and arabinose, the second most abundant pentose in nature. In this work, new findings about the molecular mechanisms governing activation, functional differentiation and catalysis of GH43 ABNs are presented. Biophysical, mutational and biochemical studies with the hyperthermostable two-domain endo-acting ABN from Thermotoga petrophila (TpABN) revealed how some GH43 ABNs are activated by calcium ions via hyperpolarization of the catalytically-relevant histidine and the importance of the ancillary domain for catalysis and conformational stability. On the other hand, the two GH43 ABNs from rumen metagenome, ARN2 and ARN3, presented a calcium-independent mechanism in which sodium is the most likely substituent for calcium ions. The crystal structure of the two-domain endo-acting ARN2 showed that its ability to efficiently degrade branched substrates is due to a larger catalytic interface with higher accessibility than that observed in other ABNs with preference for linear arabinan. Moreover, crystallographic characterization of the single-domain exo-acting ARN3 indicated that its cleavage pattern producing arabinose is associated with the chemical recognition of reducing end of the substrate imposed by steric impediments at the aglycone-binding site. By structure-guided rational design, ARN3 was converted into a classical endo enzyme, confirming the role of the extended Arg203-Ala230 loop in determining its action mode. These results reveal novel molecular aspects concerning the functioning of GH43 ABNs and provide new strategies for arabinan degradation.
Mechanistic strategies for catalysis adopted by evolutionary distinct family 43 arabinanases.,Santos CR, Polo CC, Costa MC, Nascimento AF, Meza AN, Cota J, Hoffmam ZB, Honorato RV, Oliveira PS, Goldman GH, Gilbert HJ, Prade RA, Ruller R, Squina FM, Wong DW, Murakami MT J Biol Chem. 2014 Jan 27. PMID:24469445[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Santos CR, Polo CC, Costa MC, Nascimento AF, Meza AN, Cota J, Hoffmam ZB, Honorato RV, Oliveira PS, Goldman GH, Gilbert HJ, Prade RA, Ruller R, Squina FM, Wong DW, Murakami MT. Mechanistic strategies for catalysis adopted by evolutionary distinct family 43 arabinanases. J Biol Chem. 2014 Jan 27. PMID:24469445 doi:http://dx.doi.org/10.1074/jbc.M113.537167
|
