ISDA

Deposition Date 2013-01-31

Release Date 2013-10-16

Last Version Date 2024-10-30

Entry Detail

PDB ID:

4J0L

Keywords:

HYDROLASE

Title:

Crystal Structure of a Family GH19 Chitinase (W72A/E67Q mutant) from rye seeds in complex with two (GlcNAc)4 molecules

Biological Source:

Source Organism:

Secale cereale (Taxon ID: 4550)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.90 Å

R-Value Free:

0.20

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

P 43 21 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Basic endochitinase C
Gene (Uniprot):rscc
Mutations:W72A/E67Q
Chain IDs:A
Chain Length:244
Number of Molecules:1
Biological Source:Secale cereale

UniProt ID:Q9FRV0 Pfam ID:PF00182

Ligand Molecules

EDO

SO4

Primary Citation

Complete subsite mapping of a "loopful" GH19 chitinase from rye seeds based on its crystal structure

Ohnuma, T, Umemoto, N, Kondo, K, Numata, T, Fukamizo, T.Show

Febs Lett. 587 2691 2697 (2013)

PMID: 23871710 DOI: 10.1016/j.febslet.2013.07.008

Abstact

Crystallographic analysis of a mutated form of "loopful" GH19 chitinase from rye seeds a double mutant RSC-c, in which Glu67 and Trp72 are mutated to glutamine and alanine, respectively, (RSC-c-E67Q/W72A) in complex with chitin tetrasaccharide (GlcNAc)₄ revealed that the entire substrate-binding cleft was completely occupied with the sugar residues of two (GlcNAc)₄ molecules. One (GlcNAc)₄ molecule bound to subsites -4 to -1, while the other bound to subsites +1 to +4. Comparisons of the main chain conformation between liganded RSC-c-E67Q/W72A and unliganded wild type RSC-c suggested domain motion essential for catalysis. This is the first report on the complete subsite mapping of GH19 chitinase.

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Protein

Chemical

Disease

Primary Citation of related structures