IAA synthesis

IAA biosynthesis is associated with rapidly dividing and growing tissues

Primary site of auxin synthesis are shoot apical meristem and young leaves

Root apical meristem also synthesize auxin

Young fruits an seeds also have high level of auxin

TLS Online TPP Program

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#Unit 2. Cellular Organization

Centromeric H3 (or CenH3) histone, known as Cse4 in yeast. CenH3 histones are incorporated into specialized nucleosomes present at centromeres.

TLS Online TPP Program

#Id: 403

#Unit 2. Cellular Organization

CenH3 has a unique N terminus, which does not resemble other core histones.

TLS Online TPP Program

#Id: 404

#Unit 2. Cellular Organization

Most H2A variants contain alternative C-termini, except H2ABbd, which contains a distinct N terminus.

TLS Online TPP Program

#Id: 405

#Unit 2. Cellular Organization

SpH2B has a long N-terminus and functions in Chromatin packaging

TLS Online TPP Program

#Id: 406

#Unit 2. Cellular Organization

In yeast, centromeric nucleosomes consist of Cse4, H4, and a nonhistone protein Scm3, in place of H2A-H2B dimers.

TLS Online TPP Program

#Id: 407

#Unit 2. Cellular Organization

In Drosophila, the centromeric chromatin appears to consist of “hemisomes” containing one copy each of CenH3, H4, H2A, and H2B.