4F43

Protelomerase TelA mutant R255A complexed with CAAG hairpin DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Linear Chromosome-generating System of Agrobacterium tumefaciens C58: PROTELOMERASE GENERATES AND PROTECTS HAIRPIN ENDS.

Huang, W.M.Dagloria, J.Fox, H.Ruan, Q.Tillou, J.Shi, K.Aihara, H.Aron, J.Casjens, S.

(2012) J Biol Chem 287: 25551-25563

  • DOI: 10.1074/jbc.M112.369488
  • Primary Citation of Related Structures:  
    4F41, 4F43

  • PubMed Abstract: 
  • Agrobacterium tumefaciens C58, the pathogenic bacteria that causes crown gall disease in plants, harbors one circular and one linear chromosome and two circular plasmids. The telomeres of its unusual linear chromosome are covalently closed hairpins. The circular and linear chromosomes co-segregate and are stably maintained in the organism ...

    Agrobacterium tumefaciens C58, the pathogenic bacteria that causes crown gall disease in plants, harbors one circular and one linear chromosome and two circular plasmids. The telomeres of its unusual linear chromosome are covalently closed hairpins. The circular and linear chromosomes co-segregate and are stably maintained in the organism. We have determined the sequence of the two ends of the linear chromosome thus completing the previously published genome sequence of A. tumefaciens C58. We found that the telomeres carry nearly identical 25-bp sequences at the hairpin ends that are related by dyad symmetry. We further showed that its Atu2523 gene encodes a protelomerase (resolvase) and that the purified enzyme can generate the linear chromosomal closed hairpin ends in a sequence-specific manner. Agrobacterium protelomerase, whose presence is apparently limited to biovar 1 strains, acts via a cleavage-and-religation mechanism by making a pair of transient staggered nicks invariably at 6-bp spacing as the reaction intermediate. The enzyme can be significantly shortened at both the N and C termini and still maintain its enzymatic activity. Although the full-length enzyme can uniquely bind to its product telomeres, the N-terminal truncations cannot. The target site can also be shortened from the native 50-bp inverted repeat to 26 bp; thus, the Agrobacterium hairpin-generating system represents the most compact activity of all hairpin linear chromosome- and plasmid-generating systems to date. The biochemical analyses of the protelomerase reactions further revealed that the tip of the hairpin telomere may be unusually polymorphically capable of accommodating any nucleotide.


    Organizational Affiliation

    Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, Utah 84112, USA. waimun.huang@path.utah.edu



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ProtelomeraseA320Agrobacterium fabrum str. C58Mutation(s): 1 
Gene Names: telAAtu2523
UniProt
Find proteins for Q7CWV1 (Agrobacterium fabrum (strain C58 / ATCC 33970))
Explore Q7CWV1 
Go to UniProtKB:  Q7CWV1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7CWV1
Protein Feature View
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA hairpinB [auth C]32N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.123α = 90
b = 121.258β = 111.3
c = 58.124γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-06-13
    Type: Initial release
  • Version 1.1: 2012-08-29
    Changes: Database references