Linked Life Data

17574781

Source:http://linkedlifedata.com/resource/pubmed/id/17574781

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2007-7-30
pubmed:abstractText
Novel chimeric proteins made of a globin domain fused with a "cofactor free" monooxygenase domain have been identified within the Streptomyces avermitilis and Frankia sp. genomes by means of bioinformatics methods. Structure based sequence alignments show that the globin domains of both proteins can be unambiguously assigned to the truncated hemoglobin family, in view of the striking similarity to the truncated hemoglobins from Mycobacterium tuberculosis, Thermobifida fusca and Bacillus subtilis. In turn, the non-heme domains belong to a family of small (about 100 aminoacids) homodimeric proteins annotated as antibiotic biosynthesis monooxygenases, despite the lack of a cofactor (e.g., a metal, a flavin or a heme) necessary for oxygen activation. The chimeric protein from S. avermitilis has been cloned, expressed and characterized. The protein is a stable dimer in solution based on analytical ultracentrifugation experiments. The heme ligand binding properties with oxygen and carbonmonoxide resemble those of other Group II truncated hemoglobins. In addition, an oxygen dependent redox activity has been demonstrated towards easily oxidizable substrates such as menadiol and p-aminophenol. These findings suggest novel functional roles of truncated hemoglobins, which might represent a vast class of multipurpose oxygen activating/scavenging proteins whose catalytic action is mediated by the interaction with cofactor free monooxygenases.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0378-1119
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
398
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
52-61
pubmed:meshHeading
pubmed-meshheading:17574781-Amino Acid Sequence, pubmed-meshheading:17574781-Bacterial Proteins, pubmed-meshheading:17574781-Carbon Monoxide, pubmed-meshheading:17574781-Dimerization, pubmed-meshheading:17574781-Hemeproteins, pubmed-meshheading:17574781-Kinetics, pubmed-meshheading:17574781-Mixed Function Oxygenases, pubmed-meshheading:17574781-Models, Molecular, pubmed-meshheading:17574781-Molecular Sequence Data, pubmed-meshheading:17574781-Oxidoreductases, pubmed-meshheading:17574781-Oxygen, pubmed-meshheading:17574781-Protein Binding, pubmed-meshheading:17574781-Protein Conformation, pubmed-meshheading:17574781-Protein Structure, Secondary, pubmed-meshheading:17574781-Recombinant Fusion Proteins, pubmed-meshheading:17574781-Sequence Homology, Amino Acid, pubmed-meshheading:17574781-Spectrophotometry, Ultraviolet, pubmed-meshheading:17574781-Streptomyces
pubmed:year
2007
pubmed:articleTitle
A novel chimera: the "truncated hemoglobin-antibiotic monooxygenase" from Streptomyces avermitilis.
pubmed:affiliation
Department of Biochemical Sciences, University of Rome La Sapienza, P.le Aldo Moro 5, 00185 Rome, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't