_EC 3.2.1.132 Chitosanase. 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 3.2.1.132 Chitosanase. [4 PDB entries]    
1chk

Reaction: Endohydrolysis of beta-(1->4)-linkages between D-glucosamine residues in a partly acetylated chitosan.
Comments: A whole spectrum of chitosanases are now known that can hydrolyze various types of links in chitosan. The only constant property is the endohydrolysis of GlcN-GlcN links, which is common to all known chitosanases. One known chitosanase is limited to this link recognition, while the majority can also recognize GlcN-GlcNAc links or GlcNAc-GlcN links but not both. They also do not recognize GlcNAc-GlcNAc links in partly acetylated chitosan.
Links:   [IntEnz]   [ExPASy]   [KEGG]  

There are 4 PDB entries in enzyme class E.C.3.2.1.132

  PDB code Protein
1chk
Streptomyces n174 chitosanase ph5.5 298k
Source: Streptomyces sp.. Organism_taxid: 69019. Strain: n174. Gene: csn. Expressed in: streptomyces lividans. Expression_system_taxid: 1916. Other_details: secreted (mature peptide)
Chains: A, B (238 residues) CATH domains: 1.20.141.10 3.30.386.10
1qgi
Chitosanase from bacillus circulans
Source: Bacillus circulans. Organism_taxid: 1397. Strain: mh-k1. Expressed in: brevibacillus brevis. Expression_system_taxid: 1393.
Chain: A (259 residues) CATH domains: 3.30.386.10 1.20.141.10
2d05
Chitosanase from bacillus circulans mutant k218p
Source: Bacillus circulans. Organism_taxid: 1397. Strain: mh-k1. Expressed in: brevibacillus choshinensis. Expression_system_taxid: 54911.
Chain: A (259 residues) CATH domains: 3.30.386.10 1.20.141.10
4ily
Abundantly secreted chitosanase from streptomyces sp. Sirexa
Source: Streptomyces sp. Sirexaa-e. Organism_taxid: 862751. Gene: sacte_5457. Expressed in: escherichia coli. Expression_system_taxid: 469008.
Chains: A, B (236 residues) CATH domains: 1.20.141.10 3.30.386.10