3VM5 image
Deposition Date 2011-12-08
Release Date 2012-06-06
Last Version Date 2024-11-20
Entry Detail
PDB ID:
3VM5
Keywords:
Title:
Recombinant medaka fish alpha-amylase expressed in yeast Pichia pastoris
Biological Source:
Source Organism:
Oryzias latipes (Taxon ID: 8090)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.85 Å
R-Value Free:
0.24
R-Value Work:
0.17
R-Value Observed:
0.18
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:alpha-amylase
Chain IDs:A
Chain Length:505
Number of Molecules:1
Biological Source:Oryzias latipes
Primary Citation
Structural and functional characterization of recombinant medaka fish alpha-amylase expressed in yeast Pichia pastoris.
Biochim.Biophys.Acta 1824 954 962 (2012)
PMID: 22613096 DOI: 10.1016/j.bbapap.2012.05.005

Abstact

The medaka fish α-amylase was expressed and purified. The expression systems were constructed using methylotrophic yeast Pichia pastoris, and the recombinant proteins were secreted into the culture medium. Purified recombinant α-amylase exhibited starch hydrolysis activity. The optimal pH, denaturation temperature, and K(M) and V(max) values were determined; chloride ions were essential for enzyme activity. The purified protein was also crystallized and examined by X-ray crystallography. The structure has the (α/β)(8) barrel fold, as do other known α-amylases, and the overall structure is very similar to the structure of vertebrate (human and pig) α-amylases. A novel expression plasmid was developed. Using this plasmid, high-throughput construction of an expression system by homologous recombination in P. pastoris cells, previously reported for membrane proteins, was successfully applied to the secretory protein.

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