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#carbon atoms

5 public questions tagged with this topic.

Lipid Link Protein

How many carbon atoms are present in the farnesyl lipid modification?

Prenylation adds isoprenoid lipids derived from mevalonate pathway to cysteine in CAAX motif. Two major forms exist: 15-carbon farnesyl comprising three isoprene units and 20-carbon geranylgeranyl comprising four isoprene units. Farnesyl pyrophosphate synthesized from isopentenyl pyrophosphate and dimethylallyl pyrophosphate serves donor for farnesyltransferase FTase, while geranylgeranyl pyrophosphate serves donor for geranylgeranyltransferase I and II. Farnesyl group contains 15 carbon atoms arranged as 2E,6E-farnesyl with three double bonds providing hydrophobic moiety about 10 angstrom len

Ref: Zhang & Casey, Annu Rev Biochem 1996, Prenyl groups; Wang & Casey 2016, Prenylation.

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Classification and Nomenclature of Organic Compounds - IUPAC

Which carbon atom in CH₃CH₂C(=O)CH₂CH₃ exhibits the greatest s-character in its hybridization?

In CH₃CH₂C(=O)CH₂CH₃ (pentan-3-one), the carbonyl carbon (C=O) is sp² hybridized (33% s-character), while others are sp³ (25%). No sp carbons are present, so the carbonyl carbon has the highest s-character.

Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Classification and Nomenclature of Organic Compounds - IUPAC

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