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Gene Review

PORB  -  light-dependent NADPH:protochlorophyllide...

Arabidopsis thaliana

Synonyms: F27G19.40, F27G19_40, PROTOCHLOROPHYLLIDE OXIDOREDUCTASE B, protochlorophyllide oxidoreductase B
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High impact information on PORB

  • In Arabidopsis, there are three structurally related PORs, denoted PORA, PORB, and PORC [1].
  • Two differentially expressed and regulated POR enzymes, PORA and PORB, have recently been discovered in angiosperms [2].
  • In contrast to PORB the import of PORA into plastids of cotyledons is substrate-dependent and organ-specific [3].
  • PORB and PORC thus seem to play redundant roles in maintaining light-dependent Chl biosynthesis in green plants, and are together essential for growth and development [4].

Biological context of PORB

  • The analysis of PORA and PORB import into plastids of intact seedlings revealed an unexpected multiplicity of import routes that differed by their substrate, cell, tissue and organ specificities [3].

Other interactions of PORB

  • In order to study the in vivo functions of Arabidopsis POR A and POR B we have abolished the expression of PorA through the use of the phytochrome A-mediated far-red high irradiance response [5].


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