ISDA

Deposition Date 2004-05-13

Release Date 2004-08-17

Last Version Date 2024-10-16

Entry Detail

PDB ID:

1T8S

Keywords:

HYDROLASE

Title:

Crystal Structure of E.coli AMP Nucleosidase complexed with formicin 5'-monophosphate

Biological Source:

Source Organism:

Escherichia coli (Taxon ID: 562)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.60 Å

R-Value Free:

0.25

R-Value Work:

0.22

R-Value Observed:

0.22

Space Group:

P 42 21 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:AMP nucleosidase
Chain IDs:A, B, C, D, E, F
Chain Length:484
Number of Molecules:6
Biological Source:Escherichia coli

UniProt ID:P0AE12 Pfam ID:PF10423, PF01048

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
MSE	A	MET	SELENOMETHIONINE

Ligand Molecules

FMP

Primary Citation

Structure of Escherichia coli AMP Nucleosidase Reveals Similarity to Nucleoside Phosphorylases

Zhang, Y, Cottet, S.E, Ealick, S.E.Show

STRUCTURE 12 1383 1394 (2004)

PMID: 15296732 DOI: 10.1016/j.str.2004.05.015

Abstact

AMP nucleosidase (AMN) catalyzes the hydrolysis of AMP to form adenine and ribose 5-phosphate. The enzyme is found only in prokaryotes, where it plays a role in purine nucleoside salvage and intracellular AMP level regulation. Enzyme activity is stimulated by ATP and suppressed by phosphate. The structure of unliganded AMN was determined at 2.7 A resolution, and structures of the complexes with either formycin 5'-monophosphate or inorganic phosphate were determined at 2.6 A and 3.0 A resolution, respectively. AMN is a biological homohexamer, and each monomer is composed of two domains: a catalytic domain and a putative regulatory domain. The overall topology of the catalytic domain and some features of the substrate binding site resemble those of the nucleoside phosphorylases, demonstrating that AMN is a new member of the family. The structure of the regulatory domain consists of a long helix and a four-stranded sheet and has a novel topology.

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Chemical

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Primary Citation of related structures