ISDA

Deposition Date 2001-05-25

Release Date 2002-08-14

Last Version Date 2024-05-22

Entry Detail

PDB ID:

1J9I

Keywords:

VIRAL PROTEIN

Title:

STRUCTURE OF THE DNA BINDING DOMAIN OF THE GPNU1 SUBUNIT OF LAMBDA TERMINASE

Biological Source:

Source Organism:

Enterobacteria phage lambda (Taxon ID: 10710)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

SOLUTION NMR

Conformers Calculated:

Conformers Submitted:

Selection Criteria:

structures with the lowest energy

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:TERMINASE SMALL SUBUNIT
Gene (Uniprot):Nu1
Chain IDs:A, B
Chain Length:68
Number of Molecules:2
Biological Source:Enterobacteria phage lambda

UniProt ID:P03707 Pfam ID:PF07471

Ligand Molecules

Primary Citation

Insights into specific DNA recognition during the assembly of a viral genome packaging machine.

de Beer, T, Fang, J, Ortega, M, Yang, Q, Maes, L, Duffy, C, Berton, N, Sippy, J, Overduin, M, Feiss, M, Catalano, C.E.Show

Mol.Cell 9 981 991 (2002)

PMID: 12049735 DOI: 10.1016/S1097-2765(02)00537-3

Abstact

Terminase enzymes mediate genome "packaging" during the reproduction of DNA viruses. In lambda, the gpNu1 subunit guides site-specific assembly of terminase onto DNA. The structure of the dimeric DNA binding domain of gpNu1 was solved using nuclear magnetic resonance spectroscopy. Its fold contains a unique winged helix-turn-helix (wHTH) motif within a novel scaffold. Surprisingly, a predicted P loop ATP binding motif is in fact the wing of the DNA binding motif. Structural and genetic analysis has identified determinants of DNA recognition specificity within the wHTH motif and the DNA recognition sequence. The structure reveals an unexpected DNA binding mode and provides a mechanistic basis for the concerted action of gpNu1 and Escherichia coli integration host factor during assembly of the packaging machinery.

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Primary Citation of related structures