_EC 3.2.1.176 Cellulose 1,4-beta-cellobiosidase (reducing end). 4 PDB entries  
EC 3.-.-.- Hydrolases. [21,057 PDB entries]
EC 3.2.-.- Glycosylases. [4,107 PDB entries]
EC 3.2.1.- Glycosidases, i.e. enzymes hydrolyzing O- and S-glycosyl compound [3,582 PDB entries]
EC 3.2.1.176 Cellulose 1,4-beta-cellobiosidase (reducing end). [4 PDB entries]    
1daq

Reaction: Hydrolysis of (1->4)-beta-D-glucosidic linkages in cellulose and similar substrates, releasing cellobiose from the reducing ends of the chains.
Other name(s): Cellulase Ss. Endoglucanase Ss.
Comments: Some exocellulases, most of which belong to the glycoside hydrolase family 48 (GH48), act at the reducing ends of cellulose and similar substrates. The CelS enzyme from Clostridium thermocellum is the most abundant subunit of the cellulosome formed by the organism. It liberates cellobiose units from the reducing end by hydrolysis of the glycosidic bond, employing an inverting reaction mechanism. Different from Ec 3.2.1.91, which attacks cellulose from the non- reducing end.
Links:   [IntEnz]   [ExPASy]   [KEGG]  

There are 4 PDB entries in enzyme class E.C.3.2.1.176

  PDB code Protein
1daq
Solution structure of the type i dockerin domain from the clostridium thermocellum cellulosome (minimized average structure)
Source: Clostridium thermocellum. Organism_taxid: 1515. Expressed in: escherichia coli. Expression_system_taxid: 562.
Chain: A (71 residues) CATH domain: 1.10.1330.10
1dav
Solution structure of the type i dockerin domain from the clostridium thermocellum cellulosome (20 structures)
Source: Clostridium thermocellum. Organism_taxid: 1515. Expressed in: escherichia coli. Expression_system_taxid: 562.
Chain: A (71 residues) CATH domain: 1.10.1330.10
1l1y
The crystal structure and catalytic mechanism of cellobiohydrolase cels, the major enzymatic component of the clostridium thermocellum cellulosome
Source: Clostridium thermocellum. Organism_taxid: 1515. Gene: cels. Expressed in: escherichia coli. Expression_system_taxid: 562.
Chains: A, B, C, D, E, F (642 residues) CATH domains: 1.50.10.10 2.170.160.10 4.10.870.10
1l2a
The crystal structure and catalytic mechanism of cellobiohydrolase cels, the major enzymatic component of the clostridium thermocellum cellulosome
Source: Clostridium thermocellum. Organism_taxid: 1515. Gene: cels. Expressed in: escherichia coli. Expression_system_taxid: 562.
Chains: A, B, C, D, E, F (642 residues) CATH domains: 1.50.10.10 2.170.160.10 4.10.870.10