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Chapter 6: Q13. (page 158)

Describe some of the common protein structural motifs.

Short Answer

Expert verified

Some common structural motifs in globular proteins are尾伪尾motif,尾hairpinmotifs,伪伪motifs,greekkeymotif,etc.

Step by step solution

01

Protein structural motifs

Combining the secondary structural elements, such as 伪 helices and 尾 sheets, in a globular protein forms the supersecondary structuresormotifs of the protein.

02

βαβ motif

尾伪尾 motifis the most common supersecondary structure, where an 伪 helix joins two parallel 尾 sheets.

03

β hairpin

尾 hairpinis another common supersecondary structure, where relatively tight reverse turns join the antiparallel 尾 sheets.

04

αα motif

In this supersecondary structure, two successive antiparallel 伪 helices connectwith their axis inclined. This connection allows the energetically favorable interactions in a coiled coil conformation.

05

Greek key motifs

In a greek key motif, a 尾 hairpin folds over to form 4-stranded antiparallel 尾 sheets.

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Most popular questions from this chapter

Helices can be described by the notation nm , wheren is the number of residues per helical turn andm is the number of atoms, includingH , in the ring that is closed by the hydrogen bond.

(a) What is this notation for the helix?

(b) Is the310 helix steeper or shallower than the helix?

Why is it useful to compare protein structures in addition to protein sequences?

What distinguishes regular and irregular secondary structures?

Explain why gelatin, which is mostly collagen, is nutritionally inferior to other types of protein.

Under physiological conditions, polylysine assumes a random coil conformation. Under what conditions might it form an 伪 helix?
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