title: Origin and status of homologous proteins of biomineralization (biosilicification) in the taxonomy of phylogenetic domains.
abstract: The taxonomic affiliation (in the systematisation of viruses, and biological domains) of known peptides and proteins of biomineralization (silicateins, silaffins, silacidins and silicase) and their primary structure homologues were analyzed (methods in silico; using Uniprot database). The total number of known peptides and proteins of biosilicification was counted. The data of the quantitative distribution of the detected homologues found in nature are presented. The similarity of the primary structures of silaffins, silacidins, silicateins, silicase, and their homologues was 21-94%, 45-98%, 39-50%, and 28-40%, respectively. These homologues are found in many organisms, from the Protista to the higher plants and animals, including humans, as well as in bacteria and extracellular agents, and they perform a variety of biological functions, such as biologically controlled mineralisation. The provisional classification of these biomineralization proteins is presented. The interrelation of the origin of the first organic polymers and biomineralization is discussed.
authors.affiliation: Analytical Centre of the Mineralogical and Geochemical Researches, Institute of Geology and Nature Management FEB RAS, 1 Relochny Lane, Blagoveshchensk, Russia. parimski@mail.ru
authors.forename: Igor E
authors.initials: IE
authors.lastname: Pamirsky
authors.forename: Kirill S
authors.initials: KS
authors.lastname: Golokhvast
mesh_terms: D000818:Animals; D001419:Bacteria / Q000235:genetics* / Q000378:metabolism; D002965:Classification; D056890:Eukaryota / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D010455:Peptides / Q000737:chemistry / Q000235:genetics*; D010802:Phylogeny; D017434:Protein Structure, Tertiary; D011506:Proteins / Q000737:chemistry / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D017655:Silicon Compounds / Q000737:chemistry / Q000378:metabolism*; D012822:Silicon Dioxide / Q000378:metabolism; D014780:Viruses / Q000235:genetics / Q000378:metabolism
chemical_list: D010455:Peptides; D011506:Proteins; D017655:Silicon Compounds; D012822:Silicon Dioxide