title: Crystallization and preliminary X-ray analysis of Na-ASP-1, a multi-domain pathogenesis-related-1 protein from the human hookworm parasite Necator americanus.
abstract: Human hookworm infection is a major cause of anemia and malnutrition in the developing world. In an effort to control hookworm infection, the Human Hookworm Vaccine Initiative has identified candidate vaccine antigens from the infective larval stage (L3) of the parasite, including a family of pathogenesis-related-1 (PR-1) proteins known as the ancylostoma-secreted proteins (ASPs). The functions of the ASPs are unknown. In addition, it is unclear why some ASPs have one while others have multiple PR-1 domains. There are no known structures of a multi-domain ASP and in an effort to remedy this situation, recombinant Na-ASP-1 has been expressed, purified and crystallized. Na-ASP-1 is a 406-amino-acid multi-domain ASP from the prevalent human hookworm parasite Necator americanus. Useful X-ray data to 2.2 A have been collected from a crystal that belongs to the monoclinic space group P2(1) with unit-cell parameters a = 67.7, b = 74.27, c = 84.60 A, beta = 112.12 degrees. An initial molecular-replacement solution has been obtained with one monomer in the asymmetric unit.
authors.affiliation: Eppley Institute for Research in Cancer and Allied Diseases, 987696 Nebraska Medical Center, Omaha, NE 68198-7696, USA. oasojo@unmc.edu
authors.forename: Oluwatoyin A
authors.initials: OA
authors.lastname: Asojo
authors.forename: Alex
authors.initials: A
authors.lastname: Loukas
authors.forename: Mehmet
authors.initials: M
authors.lastname: Inan
authors.forename: Rick
authors.initials: R
authors.lastname: Barent
authors.forename: Jicai
authors.initials: J
authors.lastname: Huang
authors.forename: Brad
authors.initials: B
authors.lastname: Plantz
authors.forename: Amber
authors.initials: A
authors.lastname: Swanson
authors.forename: Mark
authors.initials: M
authors.lastname: Gouthro
authors.forename: Michael M
authors.initials: MM
authors.lastname: Meagher
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Hotez
mesh_terms: D000818:Animals; D000947:Antigens, Helminth / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification; D003001:Cloning, Molecular; D003460:Crystallization / Q000379:methods; D006801:Humans; D017221:Necator americanus / Q000737:chemistry*; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins; D014961:X-Ray Diffraction
chemical_list: C508387:ASP-1 protein, Necator americanus; D000947:Antigens, Helminth; D011994:Recombinant Proteins