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Gene Review:

PORB - light-dependent NADPH:protochlorophyllide...

Arabidopsis thaliana

Synonyms: F27G19.40, F27G19_40, PROTOCHLOROPHYLLIDE OXIDOREDUCTASE B, protochlorophyllide oxidoreductase B

Kim, C. et al., Runge, S. et al., Frick, G. et al., Sperling, U. et al., Kim, C. et al.

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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].

References

Substrate-dependent and organ-specific chloroplast protein import in planta. Kim, C., Apel, K. Plant Cell (2004) [Pubmed]
Etioplast differentiation in arabidopsis: both PORA and PORB restore the prolamellar body and photoactive protochlorophyllide-F655 to the cop1 photomorphogenic mutant. Sperling, U., Franck, F., van Cleve, B., Frick, G., Apel, K., Armstrong, G.A. Plant Cell (1998) [Pubmed]
Multiplicity of different cell- and organ-specific import routes for the NADPH-protochlorophyllide oxidoreductases A and B in plastids of Arabidopsis seedlings. Kim, C., Ham, H., Apel, K. Plant J. (2005) [Pubmed]
An Arabidopsis porB porC double mutant lacking light-dependent NADPH:protochlorophyllide oxidoreductases B and C is highly chlorophyll-deficient and developmentally arrested. Frick, G., Su, Q., Apel, K., Armstrong, G.A. Plant J. (2003) [Pubmed]
Distinct roles for light-dependent NADPH:protochlorophyllide oxidoreductases (POR) A and B during greening in higher plants. Runge, S., Sperling, U., Frick, G., Apel, K., Armstrong, G.A. Plant J. (1996) [Pubmed]

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