3B9E

Crystal structure of inactive mutant E315M chitinase A from Vibrio harveyi

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 

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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:  
    3B9D, 3B9E, 3B9A, 3B8S

  • 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 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 ...

    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
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Chitinase AA584Vibrio harveyiMutation(s): 1 
Gene Names: chiA
EC: 3.2.1.14
UniProt
Find proteins for Q9AMP1 (Vibrio harveyi)
Explore Q9AMP1 
Go to UniProtKB:  Q9AMP1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.96α = 90
b = 83.106β = 90
c = 106.98γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CrystalCleardata collection
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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