Nitrite reductase

Nitrite (NO2-) is a highly reactive, potentially toxic ion.

Plant cells immediately transport the nitrite into chloroplasts or plastids.

The enzyme nitrite reductase reduces nitrite to ammonium.

Leaf chloroplasts and root plastids contain different forms of nitrite reductase.

Each polypeptide contains two prosthetic groups, an iron-sulfur group and a specialized heme.

NO3-, high sucrose conc, and light induce the transcription of nitrite reductase mRNA.

Asparagine and glutamine repress the induction.

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#Section 3: Genetics, Cellular and Molecular Biology

Persistence length,

minimum filament length at which random thermal fluctuations are likely to cause it to bend.

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#Section 3: Genetics, Cellular and Molecular Biology

The Golgi consists of four functionally distinct regions:

a. Cis compartments

b. Medial compartments

c. Trans compartments

d. Trans-Golgi network

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#Section 2: General Biology

The nitrate reductase dimer- Three binding domains

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#Id: 8343

#Section 3: Genetics, Cellular and Molecular Biology

formin family members have two adjacent domains:

FH1- rich in proline, landing site for profilin–ATP–G-actin

FH2 - form a dimer and nucleate filament assembly

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#Id: 2240

#Section 3: Genetics, Cellular and Molecular Biology

The neutral-mutation hypothesis proposes that most molecular variation is neutral with regard to natural selection and is shaped largely by mutation and genetic drift.