NDLI: The Complement of Protein Phosphatase Catalytic Subunits Encoded in the Genome of Arabidopsis1

Content Provider	PubMed Central
Author	Kerk, David Joshua, Bulgrien Smith, Douglas W. Barsam, Brooke Stella, Veretnik Gribskov, Michael
Copyright Year	2002
Abstract	Reversible protein phosphorylation is critically important in the modulation of a wide variety of cellular functions. Several families of protein phosphatases remove phosphate groups placed on key cellular proteins by protein kinases. The complete genomic sequence of the model plant Arabidopsis permits a comprehensive survey of the phosphatases encoded by this organism. Several errors in the sequencing project gene models were found via analysis of predicted phosphatase coding sequences. Structural sequence probes from aligned and unaligned sequence models, and all-against-all BLAST searches, were used to identify 112 phosphatase catalytic subunit sequences, distributed among the serine (Ser)/threonine (Thr) phosphatases (STs) of the protein phosphatase P (PPP) family, STs of the protein phosphatase M (PPM) family (protein phosphatases 2C [PP2Cs] subfamily), protein tyrosine (Tyr) phosphatases (PTPs), low-M r protein Tyr phosphatases, and dual-specificity (Tyr and Ser/Thr) phosphatases (DSPs). The Arabidopsis genome contains an abundance of PP2Cs (69) and a dearth of PTPs (one). Eight sequences were identified as new protein phosphatase candidates: five dual-specificity phosphatases and three PP2Cs. We used phylogenetic analyses to infer clustering patterns reflecting sequence similarity and evolutionary ancestry. These clusters, particularly for the largely unexplored PP2C set, will be a rich source of material for plant biologists, allowing the systematic sampling of protein function by genetic and biochemical means.
Related Links	http://dx.doi.org/10.1104/pp.004002
Ending Page	925
Page Count	18
Starting Page	908
File Format	PDF
ISSN	00320889
e-ISSN	15322548
Journal	Plant Physiology
Issue Number	2
Volume Number	129
Language	English
Publisher	American Society of Plant Physiologists
Publisher Date	2002-06-01
Access Restriction	Open
Rights Holder	American Society of Plant Physiologists
Subject Keyword	Plant Science Genetics Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Physiology Plant Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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