7JTR

Experimental Data Snapshot

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

(2021) Protein Sci 30: 1235-1246

PubMed Abstract:
Maltose binding protein (MBP) is used in recombinant protein expression as an affinity and solubility tag. The monoclonal antibody B48 binds MBP tightly and has no cross-reactivity to other proteins in an Escherichia coli lysate. This high level of specificity suggested that MBP contains an epitope that could prove useful as a purification and visualization tag for proteins expressed in E. coli. To discover the MBP epitope, a co-crystal structure was determined for MBP bound to its antibody and four amino acids of MBP were identified as critical for the binding interaction. Fusions of various fragments of MBP to the glutathione S-transferase protein were engineered in order to identify the smallest fragment still recognized by the α-MBP antibody. Stabilization of the epitope via mutational engineering resulted in a minimized 14 amino-acid tag.

Organizational Affiliation

Protein Expression and Modification, New England Biolabs, Ipswich, USA.

Macromolecule Content

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Maltose/maltodextrin-binding periplasmic protein	A, C, E, G	369	Escherichia coli	Mutation(s): 1
UniProt
Find proteins for P0AEX9 (Escherichia coli (strain K12)) Explore P0AEX9 Go to UniProtKB: P0AEX9
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P0AEX9
Sequence Annotations Expand
Reference Sequence

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(by identity cutoff) | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
single-chain Fv antibody fragment (scFv)	B, D, F, H	251	Mus musculus	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations Expand
Reference Sequence

Oligosaccharides

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose	I [auth J], J [auth K], K [auth L], L [auth M]	2		N/A	Interactions Focus chain I [auth J] Focus chain J [auth K] Focus chain K [auth L] Focus chain L [auth M] Interactions & Density Focus chain I [auth J] Focus chain J [auth K] Focus chain K [auth L] Focus chain L [auth M]
Glycosylation Resources
GlyTouCan: G07411ON GlyCosmos: G07411ON

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
CL Query on CL Download Ideal Coordinates CCD File SDF format, chain M [auth B] SDF format, chain N [auth F] SDF format, chain O [auth H] MOL2 format, chain M [auth B] MOL2 format, chain N [auth F] MOL2 format, chain O [auth H]	M [auth B], N [auth F], O [auth H]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M		Interactions Focus chain M [auth B] Focus chain N [auth F] Focus chain O [auth H] Interactions & Density Focus chain M [auth B] Focus chain N [auth F] Focus chain O [auth H]

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 3
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900001 Query on PRD_900001	I [auth J], J [auth K], K [auth L], L [auth M]	alpha-maltose	Oligosaccharide / Nutrient		Interactions Focus chain I [auth J] Focus chain J [auth K] Focus chain K [auth L] Focus chain L [auth M] Interactions & Density Focus chain I [auth J] Focus chain J [auth K] Focus chain K [auth L] Focus chain L [auth M]