title: Tail tip proteins related to bacteriophage λ gpL coordinate an iron-sulfur cluster.
abstract: The assembly of long non-contractile phage tails begins with the formation of the tail tip complex (TTC). TTCs are multi-functional protein structures that mediate host cell adsorption and genome injection. The TTC of phage λ is assembled from multiple copies of eight different proteins, including gpL. Purified preparations of gpL and several homologues all displayed a distinct reddish color, suggesting the binding of iron by these proteins. Further characterization of the gpL homologue from phage N15, which was most amenable to in vitro analyses, showed that it contains two domains. The C-terminal domain was demonstrated to coordinate an iron-sulfur cluster, providing the first example of a viral structural protein binding to this type of metal group. We characterized the iron-sulfur cluster using inductively coupled plasma-atomic emission spectroscopy, absorbance spectroscopy, and electron paramagnetic resonance spectroscopy and found that it is an oxygen-sensitive [4Fe-4S](2+) cluster. Four highly conserved cysteine residues were shown to be required for coordinating the iron-sulfur cluster, and substitution of any of these Cys residues with Ser or Ala within the context of λ gpL abolished biological activity. These data imply that the intact iron-sulfur cluster is required for function. The presence of four conserved Cys residues in the C-terminal regions of very diverse gpL homologues suggest that utilization of an iron-sulfur cluster is a widespread feature of non-contractile tailed phages that infect Gram-negative bacteria. In addition, this is the first example of a viral structural protein that binds an iron-sulfur cluster.
authors.affiliation: Department of Biochemistry, University of Toronto, Medical Sciences Building, Toronto, ON, Canada M5S 1A8.
authors.forename: William
authors.initials: W
authors.lastname: Tam
authors.forename: Lisa G
authors.initials: LG
authors.lastname: Pell
authors.forename: Diane
authors.initials: D
authors.lastname: Bona
authors.forename: Alex
authors.initials: A
authors.lastname: Tsai
authors.forename: Xiao Xian
authors.initials: XX
authors.lastname: Dai
authors.forename: Aled M
authors.initials: AM
authors.lastname: Edwards
authors.forename: Roger W
authors.initials: RW
authors.lastname: Hendrix
authors.forename: Karen L
authors.initials: KL
authors.lastname: Maxwell
authors.forename: Alan R
authors.initials: AR
authors.lastname: Davidson
mesh_terms: D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D010582:Bacteriophage lambda / Q000737:chemistry* / Q000502:physiology*; D003545:Cysteine / Q000378:metabolism; D006090:Gram-Negative Bacteria / Q000821:virology; D007501:Iron / Q000378:metabolism; D007506:Iron-Sulfur Proteins / Q000737:chemistry* / Q000378:metabolism*; D008969:Molecular Sequence Data; D050505:Mutant Proteins / Q000737:chemistry / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D011485:Protein Binding; D016415:Sequence Alignment; D013057:Spectrum Analysis; D013455:Sulfur / Q000378:metabolism; D017376:Viral Tail Proteins / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D007506:Iron-Sulfur Proteins; D050505:Mutant Proteins; D017376:Viral Tail Proteins; D013455:Sulfur; D007501:Iron; D003545:Cysteine; D010100:Oxygen
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