Cellobiohydrolase: Difference between revisions

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== Function ==
== Function ==


'''Cellobiohydrolase''' (CBH) is a cellulase which degrades cellulose by hydrolysing the 1,4-β-D-glycosidic bonds.  CBH is an exocellulase which cleaves two to four units from the ends of cellulose.  There are two types of CBH.  '''CBHI''' cleaves progressively from the reducing end while '''CBHII''' cleaves progressively from the nonreducing end of cellulose.<ref>PMID:9466911</ref>. The exo-acting CBH I is called '''Cel7A'''. The endo-acting CBH I is called '''Cel7B'''.  
'''Cellobiohydrolase''' (CBH) is a cellulase which degrades [[cellulose]] by hydrolysing the 1,4-β-D-glycosidic bonds.  CBH is an exocellulase which cleaves two to four units from the ends of cellulose.  There are two types of CBH.  '''CBHI''' cleaves progressively from the reducing end while '''CBHII''' cleaves progressively from the nonreducing end of cellulose.<ref>PMID:9466911</ref>. The exo-acting CBH I is called '''Cel7A'''. The endo-acting CBH I is called '''Cel7B'''.  '''Cellobiohydrolase Cel6A''' contains an active site within a tunnel which opens and closes in response to ligand binding<ref>PMID:12842048</ref>.


==Structural highlights ==
==Structural highlights ==
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</StructureSection>
</StructureSection>
==3D structures of cellobiohydrolase==
Updated on {{REVISIONDAY2}}-{{MONTHNAME|{{REVISIONMONTH}}}}-{{REVISIONYEAR}}
{{#tree:id=OrganizedByTopic|openlevels=0|
*Cellobiohydrolase I or exoglucanase 1
 
**[[1cel]], [[4p1h]], [[4p1j]], [[5tc9]] – HjCBHI Cel7A catalytic domain – ''Hypocrea jecorina''<BR />
**[[2cel]], [[4cel]], [[1egn]], [[1q2b]], [[5oa5]] - HjCBHI catalytic domain (mutant) <BR />
**[[1cbh]], [[2cbh]], [[5x34]], [[5x35]], [[5x36]], [[5x37]], [[5x38]] – HjCBHI C terminal – NMR<BR />
**[[5x3c]], [[5x39]] – HjCBHI C terminal (mutant) – NMR<br />
**[[1azh]], [[1az6]], [[1azj]], [[1azk]] - HjCBHI cellulose-binding domain (mutant) - NMR<BR />
**[[1gpi]] - PcCBHI Cel7D catalytic domain – ''Phanerochaete chrysosporium''<BR />
**[[1q9h]], [[3pfj]] - TeCBHI Cel7A catalytic domain – ''Talaromyces emersonii''<BR />
**[[2yok]], [[2y9n]] - CBHI Cel7A catalytic domain – ''Hypocrea lixii''<br />
**[[5mcc]], [[5mcd]], [[5mce]], [[5mcf]], [[5mch]], [[5mci]], [[5mcj]], [[5mck]], [[5mcl]], [[5mcm]], [[5mcn]], [[4xnn]] – wfCBHI – water flea<br />
**[[4zzv]], [[5amp]] - GcCBHI Cel7A catalytic domain – ''Galactomyces candidum''<br />
**[[2mwk]], [[2mwj]] - TrCBHI Cel7A carbohydrate-binding module 1 domain – ''Trichoderma reesei''<br />
**[[4v1z]] – AfCBH Cel7A – ''Aspergillus fumigatus''<br />
*''Cellobiohydrolase I binary complex''
**[[3cel]], [[4uwt]] - HjCBHI Cel7A catalytic domain (mutant) + cellobiose<br />
**[[5cel]], [[1q2e]], [[4d5v]] - HjCBHI Cel7A catalytic domain (mutant) + cellotetraose<br />
**[[4d5q]] - HjCBHI Cel7A catalytic domain + cellopentaose<br />
**[[6cel]], [[4d5o]], [[4d5p]] - HjCBHI Cel7A catalytic domain (mutant) + cellopentaose<br />
**[[7cel]] - HjCBHI catalytic domain (mutant) + glucose<br />
**[[2v3i]], [[2v3r]] - HjCBHI Cel7A catalytic domain + phenanthrenolol<br />
**[[1dy4]], [[6grn]] - TrCBHI Cel7A catalytic domain + propranolol derivative<BR />
**[[4v0z]] - TrCBH Cel7A catalytic domain + cellobiose<br />
**[[4vwt]] - TrCBH Cel7A (mutant) catsalytic domain + cellobiose<br />
**[[4c4c]] - TrCBHI Cel7A catalytic domain (mutant) + cellononaose <br />
**[[4c4d]], [[4d5i]], [[4d5j]] - TrCBHI Cel7A catalytic domain (mutant) + cellotrioside <br />
**[[3pfx]] - TeCBHI Cel7A catalytic domain + cellobiose<br />
**[[3pfz]] - TeCBHI Cel7A catalytic domain + cellotetraose + cellobiose<br />
**[[3pl3]] - TeCBHI Cel7A catalytic domain + cellopentaose<br />
**[[4zzu]] - GgCBHI Cel7A catalytic domain + cellotetraose – ''Galactomyces geotrichum''<br />
**[[4zzw]] - GgCBHI Cel7A catalytic domain + cellobiose <br />
**[[4zzt]] - GcCBHI Cel7A catalytic domain + cellotraiose <br />
**[[5w11]] - CBHI Cel7A catalytic domain + cellotriose – ''Myceliophthota thermophila''<br />
**[[5o5d]] - HaCBHI Cel7A catalytic domain – ''Hypocrea atroviridis''<br />
**[[5o59]] - HaCBHI Cel7A catalytic domain + glucose <br />
**[[4v20]] - AfCBH Cel7A catalytic domain + disaccharide<br />
**[[1h46]] - PcCBHI Cel7D catalytic domain + propranolol<br />
**[[1z3t]] - PcCBHI Cel7D catalytic domain + cellobiose<br />
**[[1z3v]] - PcCBHI Cel7D catalytic domain + lactose<br />
**[[1z3w]] - PcCBHI Cel7D catalytic domain + cellobioimidazole<BR />
*Cellobiohydrolase II or Cellobiohydrolase Cel6A or exoglucanase 2
**[[3cbh]] – HjCBHII core<BR />
**[[1cb2]] – HjCBHII catalytic domain (mutant) <BR />
**[[1hgw]], [[1hgy]], [[1oc6]] – HjCBHII Cel6A catalytic domain (mutant)
*''Cellobiohydrolase II complex''
**[[1bvw]] - HiCBHII catalytic domain + mannose – ''Humicola insolens''<BR />
**[[4au0]] - HjCBHII catalytic domain Cel6A (mutant) + cellobioside<br />
**[[2bvw]] - HiCBHII Cel6A catalytic domain + glucose + cellotetraose<br />
**[[1gz1]], [[1oc5]] - HiCBHII Cel6A catalytic domain (mutant) + cellotetraose<br />
**[[1oc7]] - HiCBHII Cel6A catalytic domain (mutant) + cellopentaose<br />
**[[1ocj]] - HiCBHII Cel6A catalytic domain + cellopentaose<br />
**[[1ocb]] - HiCBHII Cel6A catalytic domain + fluorescent substrate<BR />
**[[1ocn]] - HiCBHII Cel6A catalytic domain (mutant) + isofagomine<BR />
**[[1qjw]] - TrCBHII Cel6A catalytic domain (mutant) + cellotetraose<br />
**[[4ax6]], [[4ax7]] - TrCBHII Cel6A catalytic domain (mutant) + cellobioside<br />
**[[1qk0]] - TrCBHII Cel6A catalytic domain + polysaccharide<BR />
**[[1qk2]] - TrCBHII Cel6A catalytic domain + cellotetraose<br />
**[[4a05]] - CBHII Cel6A catalytic domain + cellotetraose – ''Chaetonium thermophilum''<br />
*Other cellobiohydrolases
**[[1l1y]] – CtCBH CelS – ''Clostridium thermocellum''<BR />
**[[1rq5]] - CtCBHA (mutant) <BR />
**[[1ut9]] - CtCBHA catalytic domain<BR />
**[[1sqj]] - GgCBH <BR />
**[[3a64]], [[3vog]] - CcCBH Cel6C catalytic domain - ''Coprinopsis cinerea''<BR />
**[[3vof]], [[3voj]] - CcCBHI Cel6C catalytic domain (mutant)<br />
**[[2mte]] – CBH CelS residues 673-741 – ''Ruminiclostridium thermocellum'' - NMR<br />
*''Other cellobiohydrolases binary complex''
**[[1l2a]] - CtCBH CelS + glucose<br />
**[[2ebs]] – GgCBH (mutant) + heptasaccharide<BR />
**[[4avn]] - CBH Cel6B + cellobiose – Thermobifidia fusca<br />
**[[3a9b]], [[3voh]] - CcCBHI Cel6C catalytic domain + cellobiose<br />
**[[3abx]], [[3voi]] - CcCBHI Cel6C catalytic domain + cellotriose<br />
**[[4v20]] - AfCBH Cel7A + disaccharide<br />


}}
== References ==
== References ==
<references/>
<references/>
[[Category:Topic Page]]
[[Category:Topic Page]]

Latest revision as of 18:26, 24 August 2019


Function

Cellobiohydrolase (CBH) is a cellulase which degrades cellulose by hydrolysing the 1,4-β-D-glycosidic bonds. CBH is an exocellulase which cleaves two to four units from the ends of cellulose. There are two types of CBH. CBHI cleaves progressively from the reducing end while CBHII cleaves progressively from the nonreducing end of cellulose.[1]. The exo-acting CBH I is called Cel7A. The endo-acting CBH I is called Cel7B. Cellobiohydrolase Cel6A contains an active site within a tunnel which opens and closes in response to ligand binding[2].

Structural highlights

The of CBH contains (Gln-Asp-Glu in 3cel, cyan) and is situated at the .[3] Water molecules shown as red spheres.

3D structures of cellobiohydrolase

Cellobiohydrolase 3D structures


Glycosylated cellobiohydrolase I catalytic domain complex with cellobiose and Cd+2 ions (PDB code 3cel)

Drag the structure with the mouse to rotate

ReferencesReferences

  1. ↑ Divne C, Stahlberg J, Teeri TT, Jones TA. High-resolution crystal structures reveal how a cellulose chain is bound in the 50 A long tunnel of cellobiohydrolase I from Trichoderma reesei. J Mol Biol. 1998 Jan 16;275(2):309-25. PMID:9466911 doi:http://dx.doi.org/10.1006/jmbi.1997.1437
  2. ↑ Varrot A, Frandsen TP, von Ossowski I, Boyer V, Cottaz S, Driguez H, Schulein M, Davies GJ. Structural basis for ligand binding and processivity in cellobiohydrolase Cel6A from Humicola insolens. Structure. 2003 Jul;11(7):855-64. PMID:12842048
  3. ↑ Stahlberg J, Divne C, Koivula A, Piens K, Claeyssens M, Teeri TT, Jones TA. Activity studies and crystal structures of catalytically deficient mutants of cellobiohydrolase I from Trichoderma reesei. J Mol Biol. 1996 Nov 29;264(2):337-49. PMID:8951380 doi:http://dx.doi.org/10.1006/jmbi.1996.0644

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