Molecular (sub-)structures responsible for interaction with electromagnetic radiation are called chromophores. 

TLS Online TPP Program

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#Unit 1. Molecules and their Interaction Relevant to Biology

The liver PK isozyme (L form) is regulated by glucagon

TLS Online TPP Program

#Id: 346

#Unit 1. Molecules and their Interaction Relevant to Biology

Pyruvate Carboxylase

a mitochondrial enzyme that requires the coenzyme biotin, converts the pyruvate to oxaloacetate

TLS Online TPP Program

#Id: 349

#Unit 1. Molecules and their Interaction Relevant to Biology

The oxaloacetate is converted to PEP by phosphoenolpyruvate carboxykinase. This Mg2+ dependent reaction requires GTP as the phosphoryl group donor.

TLS Online TPP Program

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#Unit 1. Molecules and their Interaction Relevant to Biology

Transketolase requires the cofactor thiamine pyrophosphate (TPP)

TLS Online TPP Program

#Id: 354

#Unit 1. Molecules and their Interaction Relevant to Biology

Acetyl-CoA and NADH are potent allosteric inhibitors of the enzyme. 

TLS Online TPP Program

#Id: 355

#Unit 1. Molecules and their Interaction Relevant to Biology

Acetyl-CoA inhibits the transacetylase component whereas NADH inhibits the dihydrolipoyl dehydrogenase component.