title: The salivary adenosine deaminase from the sand fly Lutzomyia longipalpis.
abstract: In the process of sequencing a subtracted cDNA library from the salivary glands of the sand fly Lutzomyia longipalpis, we identified a cDNA with similarities to gene products of the adenosine deaminase family. Prompted by this cDNA finding, we detected adenosine deaminase activity at levels of 1 U/mg protein in salivary gland homogenates. The activity was significantly reduced following a blood meal indicating its apparent secretory fate. The native enzyme has a K(m) of approximately 10 microM, an isoelectric pH between 4.5 and 5.5, and an apparent molecular weight of 52 kDa by size exclusion chromatography. The possible role of this enzyme, which converts adenosine to inosine, in the feeding physiology of L. longipalpis is discussed.
authors.affiliation: Section of Medical Entomology, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, Building 4, Room 126, 4 Center Drive, MSC-0425, Bethesda, Maryland, 20892-0425, USA. rcharlab@niaid.nih.gov
authors.forename: R
authors.initials: R
authors.lastname: Charlab
authors.forename: E D
authors.initials: ED
authors.lastname: Rowton
authors.forename: J M
authors.initials: JM
authors.lastname: Ribeiro
mesh_terms: D000243:Adenosine Deaminase / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002850:Chromatography, Gel; D018076:DNA, Complementary / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007526:Isoelectric Point; D008969:Molecular Sequence Data; D011576:Psychodidae / Q000201:enzymology*; D012463:Saliva / Q000201:enzymology; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
chemical_list: D018076:DNA, Complementary; D000243:Adenosine Deaminase