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Hydrolase PDB-id
1rd6
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Protein chain
540 a.a. *
Waters ×285

* Residue conservation analysis
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PDB id: 1rd6
Name: Hydrolase
Title: Crystal structure of s. Marcescens chitinase a mutant w167a

Structure:
Chitinase a. Chain: a. Engineered: yes. Mutation: yes

Source:
Serratia marcescens. Organism_taxid: 615. Gene: chia. Expressed in: escherichia coli bl21(de3). Expression_system_taxid: 469008.

UniProt:
P07254 (CHIA_SERMA) Pfam   ArchSchema ?
Seq:
Struc:
Seq:
Struc:
Seq: 563 a.a.
Struc: 540 a.a.*
Key:    PfamA domain
 Secondary structure  CATH domain
* PDB and UniProt seqs differ at 8 residue positions (black crosses)

Enzyme class:
E.C.3.2.1.14   [IntEnz]   [ExPASy]   [KEGG]   [BRENDA]

Reaction:
Hydrolysis of the 1,4-beta-linkages of N-acetyl-D-glucosamine polymers of chitin.

Resolution:
2.60Å

R-factor:
0.195

R-free:
0.235

Authors:
N.N.Aronson,B.A.Halloran,M.F.Alexyev,X.E.Zhou,Y.Wang, E.J.Meehan,L.Chen

Key ref:
N.N.Aronson et al. (2006). Mutation of a conserved tryptophan in the chitin-binding cleft of Serratia marcescens chitinase A enhances transglycosylation.. Biosci Biotechnol Biochem, 70, 243-251. [PubMed id: 16428843] [DOI: 10.1271/bbb.70.243]

Date:
05-Nov-03

Release date:
07-Dec-04
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    Key reference    
 
 
DOI no: 10.1271/bbb.70.243 Biosci Biotechnol Biochem 70:243-251 (2006)
PubMed id: 16428843  
 
 
Mutation of a conserved tryptophan in the chitin-binding cleft of Serratia marcescens chitinase A enhances transglycosylation.
N.N.Aronson, B.A.Halloran, M.F.Alexeyev, X.E.Zhou, Y.Wang, E.J.Meehan, L.Chen.
 
  ABSTRACT  
 
Family 18 chitinases have the signature peptide DGXDXDXE forming the fourth beta-strand in the (beta/alpha)8-barrel of their catalytic domain. The carboxyl-end glutamic acid, E315 in Serratia marcescens chitinase A, serves as the acid/base during chitin hydrolysis, and the side-chain of the preceding aspartic acid, D313, helps to position correctly the N-acetyl moiety of the glycosyl sugar undergoing hydrolysis. Chitin substrates are bound within a long cleft across the top of the barrel, whose floor consists of aromatic residues that hydrophobically stack with every other GlcNAc. Alanine substitution of the conserved Trp167 at the -3 subsite in Serratia marcescens chitinase A enhanced transglycosylation. Higher oligosaccharides were formed from both chitin tetra- and pentasaccharide, and the only hydrolytic product from chitin trisaccharide was the disaccharide. Greater retention of the glycosyl fragment at the active site of the -3 mutant of Serratia marcescens chitinase A might favor transglycosylation due to a stabilized conformation of its D313.
 

Literature references that cite this PDB file's key reference

  PubMed id Reference
19244232 H.Zakariassen, B.B.Aam, S.J.Horn, K.M.Vårum, M.Sørlie, and V.G.Eijsink (2009).
Aromatic Residues in the Catalytic Center of Chitinase A from Serratia marcescens Affect Processivity, Enzyme Activity, and Biomass Converting Efficiency.
  J Biol Chem, 284, 10610-10617.  
19696236 T.Taira, H.Hayashi, Y.Tajiri, S.Onaga, G.Uechi, H.Iwasaki, T.Ohnuma, and T.Fukamizo (2009).
A plant class V chitinase from a cycad (Cycas revoluta): biochemical characterization, cDNA isolation, and posttranslational modification.
  Glycobiology, 19, 1452-1461.  
16794344 N.N.Aronson, and B.A.Halloran (2006).
Optimum substrate size and specific anomer requirements for the reducing-end glycoside hydrolase di-N-acetylchitobiase.
  Biosci Biotechnol Biochem, 70, 1537-1541.  
The most recent references are shown first. Citation data come partly from CiteXplore and partly from an automated harvesting procedure. Note that this is likely to be only a partial list as not all journals are covered by either method. However, we are continually building up the citation data so more and more references will be included with time.