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A COCCOLITHOPHORID CALCIFYING VESICLE WITH A VACUOLAR‐TYPE ATPASE PROTON PUMP: CLONING AND IMMUNOLOCALIZATION OF THE V 0 SUBUNIT c
Author(s) -
Corstjens Paul L. A. M.,
Araki Yoko,
González Elma L.
Publication year - 2001
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1046/j.1529-8817.1999.014012071.x
Subject(s) - biology , vesicle , coccolith , golgi apparatus , protein subunit , microbiology and biotechnology , biochemistry , complementary dna , molecular mass , membrane , gene , endoplasmic reticulum , chemistry , organic chemistry , carbonate , enzyme
Coccolithophorid calcification is subcellular. It relies on a single Golgi apparatus to produce coccoliths consisting of an organic baseplate and calcite. The calcification reaction is initiated in a calcifying vesicle derived from the trans ‐most Golgi. We have cloned a subunit of a V (vacuolar)‐ATPase (EC 3.6.1.3., ATP phosphohydrolase) from a Pleurochrysis (Haptophyceae) cDNA library of transcripts expressed during calcification. Degenerate PCR primers were developed after alignment of the higher plant V‐ATPase subunit c genes to identify conserved consensus sequences. The library was screened with a homologous probe obtained by PCR. The cloned gene is found as a single copy on the P. cartarae (strain 136) genome and includes a 495‐base pair open reading frame encoding a 164 amino acid polypeptide and deduced molecular mass of 16.2 kDa. Its deduced amino acid sequence shows a close relationship to subunit c of the V o domain of the vacuolar proton‐pumping ATPase of higher plants. An in vitro ‐synthesized oligopeptide corresponding to the L2 extramembrane domain was used for rabbit immunization. Affinity‐purified antiserum detected a polypeptide band with an apparent molecular mass of 24 kDa in immunoblots of highly enriched coccolith vesicle membranes. Immunofluoresence microscopy showed antibody specificity for the membranes of isolated coccolith vesicles. This work provides support for the existence of an authentic, vacuolar‐type, proton‐pumping ATPase on coccolith vesicle membranes in a calcifying coccolithophorid.