3B9E

Crystal structure of inactive mutant E315M chitinase A from Vibrio harveyi

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.189 

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This is version 1.1 of the entry. See complete history. 

Literature

Crystal structures of Vibrio harveyi chitinase A complexed with chitooligosaccharides: implications for the catalytic mechanism

Songsiriritthigul, C., Pantoom, S., Aguda, A.H., Robinson, R.C., Suginta, W.

(2008) J.Struct.Biol. 162: 491-499

  • DOI: 10.1016/j.jsb.2008.03.008
  • Primary Citation of Related Structures:  
  • Also Cited By: 5YQW, 3AS3, 3AS2, 3AS1, 3AS0, 3ARZ, 3ARY, 3ARX, 3ARW, 3ARV, 3ARU, 3ART, 3ARS, 3ARR, 3ARQ, 3ARP, 3ARO

  • PubMed Abstract: 

    • This research describes four X-ray structures of Vibrio harveyi chitinase A and its catalytically inactive mutant (E315M) in the presence and absence of substrates. The overall structure of chitinase A is that of a typical family-18 glycosyl hydrolas ...

    This research describes four X-ray structures of Vibrio harveyi chitinase A and its catalytically inactive mutant (E315M) in the presence and absence of substrates. The overall structure of chitinase A is that of a typical family-18 glycosyl hydrolase comprising three distinct domains: (i) the amino-terminal chitin-binding domain; (ii) the main catalytic (alpha/beta)(8) TIM-barrel domain; and (iii) the small (alpha+beta) insertion domain. The catalytic cleft of chitinase A has a long, deep groove, which contains six chitooligosaccharide ring-binding subsites (-4)(-3)(-2)(-1)(+1)(+2). The binding cleft of the ligand-free E315M is partially blocked by the C-terminal (His)(6)-tag. Structures of E315M-chitooligosaccharide complexes display a linear conformation of pentaNAG, but a bent conformation of hexaNAG. Analysis of the final 2F(o)-F(c) omit map of E315M-NAG6 reveals the existence of the linear conformation of the hexaNAG at a lower occupancy with respect to the bent conformation. These crystallographic data provide evidence that the interacting sugars undergo conformational changes prior to hydrolysis by the wild-type enzyme.

    Organizational Affiliation: 

    School of Biochemistry, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chitinase A
A
584Vibrio harveyiMutation(s): 1 
Gene Names: chiA
Find proteins for Q9AMP1 (Vibrio harveyi)
Go to UniProtKB:  Q9AMP1
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 63.960α = 90.00
b = 83.106β = 90.00
c = 106.980γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
REFMACrefinement
AMoREphasing
MOSFLMdata reduction
CrystalCleardata collection

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-04-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance