5JBN image
Deposition Date 2016-04-13
Release Date 2016-05-25
Last Version Date 2024-03-06
Entry Detail
PDB ID:
5JBN
Keywords:
Title:
Crystal Structure of Apo Phosphopantetheine Adenylyltransferase (PPAT/CoaD) from E. coli
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.45 Å
R-Value Free:
0.18
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
I 2 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Phosphopantetheine adenylyltransferase
Gene (Uniprot):coaD
Chain IDs:A, B
Chain Length:170
Number of Molecules:2
Biological Source:Escherichia coli (strain K12)
Primary Citation
Facilitating unambiguous NMR assignments and enabling higher probe density through selective labeling of all methyl containing amino acids.
J.Biomol.Nmr 65 15 27 (2016)
PMID: 27130242 DOI: 10.1007/s10858-016-0032-2

Abstact

The deuteration of proteins and selective labeling of side chain methyl groups has greatly enhanced the molecular weight range of proteins and protein complexes which can be studied using solution NMR spectroscopy. Protocols for the selective labeling of all six methyl group containing amino acids individually are available, however to date, only a maximum of five amino acids have been labeled simultaneously. Here, we describe a new methodology for the simultaneous, selective labeling of all six methyl containing amino acids using the 115 kDa homohexameric enzyme CoaD from E. coli as a model system. The utility of the labeling protocol is demonstrated by efficiently and unambiguously assigning all methyl groups in the enzymatic active site using a single 4D (13)C-resolved HMQC-NOESY-HMQC experiment, in conjunction with a crystal structure. Furthermore, the six fold labeled protein was employed to characterize the interaction between the substrate analogue (R)-pantetheine and CoaD by chemical shift perturbations, demonstrating the benefit of the increased probe density.

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