ISDA: 1JF6

Deposition Date 2001-06-20

Release Date 2002-05-22

Last Version Date 2024-05-29

Entry Detail

PDB ID:

1JF6

Keywords:

HYDROLASE

Title:

Crystal structure of thermoactinomyces vulgaris r-47 alpha-amylase mutant F286Y

Biological Source:

Source Organism:

Thermoactinomyces vulgaris (Taxon ID: 2026)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

3.20 Å

R-Value Free:

0.28

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

P 21 21 21

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:ALPHA AMYLASE II
Gene (Uniprot):tvaII
Mutagens:F286Y
Chain IDs:A, B
Chain Length:585
Number of Molecules:2
Biological Source:Thermoactinomyces vulgaris

UniProt ID:Q08751 Pfam ID:PF00128, PF02903, PF16657

Ligand Molecules

Primary Citation

Role of Phe286 in the recognition mechanism of cyclomaltooligosaccharides (cyclodextrins) by Thermoactinomyces vulgaris R-47 alpha-amylase 2 (TVAII). X-ray structures of the mutant TVAIIs, F286A and F286Y, and kinetic analyses of the Phe286-replaced mutant TVAIIs

Ohtaki, A, Kondo, S, Shimura, Y, Tonozuka, T, Sakano, Y, Kamitori, S, Kamitori, S, Kondo, S, Okuyama, K, Yokota, T, Shimura, Y, Tonozuka, T, Sakano, Y.Show

CARBOHYDR.RES. 334 309 313 (2001)

PMID: 11527532 DOI: 10.1016/S0008-6215(01)00190-2

Abstact

Phe286 located in the center of the active site of alpha-amylase 2 from Thermoactinomyces vulgaris R-47 (TVAII) plays an important role in the substrate recognition for cyclomaltooligosaccharides (cyclodextrins). The X-ray structures of mutant TVAIIs with the replacement of Phe286 by Ala (F286A) and Tyr (F286Y) were determined at 3.2 A resolution. Their structures have no significant differences from that of the wild-type enzyme. The kinetic analyses of Phe286-replaced variants showed that the variants with non-aromatic residues, Ala (F286A) and Leu (F286L), have lower enzymatic activities than those with aromatic residues, Tyr (F286Y) and Trp (F286W), and the replacement of Phe286 affects enzymatic activities for CDs more than those for starch.

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Primary Citation of related structures