ISDA

Deposition Date 2012-01-14

Release Date 2012-12-05

Last Version Date 2024-02-28

Entry Detail

PDB ID:

4DBC

Keywords:

TRANSFERASE

Title:

Substrate Activation in Aspartate Aminotransferase

Biological Source:

Source Organism:

Escherichia coli (Taxon ID: 83333)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.50 Å

R-Value Free:

0.19

R-Value Work:

0.16

R-Value Observed:

0.17

Space Group:

C 2 2 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Aspartate aminotransferase
Gene (Uniprot):aspC
Mutations:K258A
Chain IDs:A
Chain Length:396
Number of Molecules:1
Biological Source:Escherichia coli

UniProt ID:P00509 Pfam ID:PF00155 EC:2.6.1.1

Ligand Molecules

3QP

EDO

SO4

Primary Citation

Ground-state electronic destabilization via hyperconjugation in aspartate aminotransferase.

Griswold, W.R, Castro, J.N, Fisher, A.J, Toney, M.D.Show

J.Am.Chem.Soc. 134 8436 8438 (2012)

PMID: 22551424 DOI: 10.1021/ja302809e

Abstact

Binding isotope effects for l-aspartate reacting with the inactive K258A mutant of PLP-dependent aspartate aminotransferase to give a stable external aldimine intermediate are reported. They provide direct evidence for electronic ground-state destabilization via hyperconjugation. The smaller equilibrium isotope effect with deazaPLP-reconstituted K258A indicates that the pyridine nitrogen plays an important role in labilizing the Cα-H bond.

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Protein

Chemical

Disease

Primary Citation of related structures