Question

Can you help me to answer this question

2- Calmodulin is a biological macromolecule that binds Ca ions and is involved in a variety of biological processes involving Ca2+ regulation. Binding of Ca2+ induces a structural change that can be measured by observing a change in the radius of gyration. If the Re for calmodulin decreases from 22.5 to 21.5 Å in the presence of Ca2+, what is the relative change in bond length?

Answer 1

As mentioned in the question that Binding of Ca2+ induces a structural change that can be measured by observing a change in the radius of gyration given that Re for calmodulin decreases from 22.5 to 21.5 Å in the presence of Ca2+, the relative change in bond length can be determined by using actual value divided by the changed volume in presence of Ca2+ x100 that is

                                                            22.5 / 21.5 = 1.04 Å