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PMID: 11402198 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Inventory of the superfamily of P-type ion pumps in Arabidopsis.

Plant physiology ·Vol. 126 ·No. 2 ·2001-06-00 ·Pages 696-706

Axelsen KB, Palmgren MG

Abstract

A total of 45 genes encoding for P-type ATPases have been identified in the complete genome sequence of Arabidopsis. Thus, this plant harbors a primary transport capability not seen in any other eukaryotic organism sequenced so far. The sequences group in all five subfamilies of P-type ATPases. The most prominent subfamilies are P(1B) ATPases (heavy metal pumps; seven members), P(2A) and P(2B) ATPases (Ca(2+) pumps; 14 in total), P(3A) ATPases (plasma membrane H(+) pumps; 12 members including a truncated pump, which might represent a pseudogene or an ATPase-like protein with an alternative function), and P(4) ATPases (12 members). P(4) ATPases have been implicated in aminophosholipid flipping but it is not known whether this is a direct or an indirect effect of pump activity. Despite this apparent plethora of pumps, Arabidopsis appears to be lacking Na(+) pumps and secretory pathway (PMR1-like) Ca(2+)-ATPases. A cluster of Arabidopsis heavy metal pumps resembles bacterial Zn(2+)/Co(2+)/Cd(2+)/Pb(2+) transporters. Two members of the cluster have extended C termini containing putative heavy metal binding motifs. The complete inventory of P-type ATPases in Arabidopsis is an important starting point for reverse genetic and physiological approaches aiming at elucidating the biological significance of these pumps.

MeSH Terms
Adenosine Triphosphatases/chemistry,metabolism Amino Acid Sequence Animals Arabidopsis/enzymology Humans Molecular Sequence Data Sodium/metabolism
Chemicals
Sodium Adenosine Triphosphatases
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Axelsen K B
SwissProt Group, Swiss Institute of Bioinformatics, 1 rue Michel Servet, CH-1211 Geneva 4, Switzerland.
Palmgren M G
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Article Info
Journal
Plant physiology
Abbr.
Plant Physiol
ISSN
0032-0889
DOI
10.1104/pp.126.2.696
Published
2001-06-00
Pages
696-706
Language
English
Region
United States
NLM ID
0401224
PMCID
PMC111160
Subset
IM
External Links
PubMed source DOI: 10.1104/pp.126.2.696 PMC Full Text View journal details
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