Class I enzymes attach the amino acid to the 2’-OH of the tRNA and are generally monomeric. Class II enzymes attach the amino acid to the 3’-OH of the tRNA and are typically dimeric or tetrameric.The amino acids for which the Class I synthetases are specific tend to be larger and more hydrophobic than those for Class II synthetases.

TLS Online TPP Program

#Id: 3870

#Unit 5. Developmental Biology

Secreted GABA then acts on prestalk cells to induce the cell-surface exposure of the serine protease domain of the ABC transporter TagC.

TLS Online TPP Program

#Id: 3871

#Unit 5. Developmental Biology

Once all proteins are functioning, a few starving cells start to emit cAMP pulses.

TLS Online TPP Program

#Id: 3872

#Unit 5. Developmental Biology

GABA acts on prespore cells to induce secretion of AcbA.

TLS Online TPP Program

#Id: 3873

#Unit 5. Developmental Biology

AcbA is cleaved by the TagC protease to produce the peptide     SDF-2.

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#Id: 3874

#Unit 5. Developmental Biology

Chemotaxis of Dictyostelium myxamoebae is a result of spiral waves of cAMP.

TLS Online TPP Program

#Id: 3875

#Unit 5. Developmental Biology

Neighboring cells respond to cAMP in two ways:

• Initiate a movement toward the cAMP pulse for about a minute
• Release cAMP of their ownNeighboring cells respond to cAMP in two ways:

• Initiate a movement toward the cAMP pulse for about a minute
• Release cAMP of their own