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I have been trying to understand the phenomenon of lipid packing defect, but the resources in this subject are very limited. Well, I did find some papers, but before reading papers, I want to have some intuitive knowledge about it. Can anyone explain to me lipid packing defect in brief. Thanks

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closed as too broad by David, WYSIWYG, theforestecologist Aug 20 at 22:09

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ It really is your responsibility to show the research you have done before posting, give some references to this phenomenon and ask a precise question about what you do not understand. Asking someone to explain the phenomenon — whatever it is — is much too broad for the purposes of this site. $\endgroup$ – David Aug 17 at 11:55
  • $\begingroup$ We ask that all question posters here attempt to search for an answer to their own question and explicitly indicate what research they've already done, what they learned, and what is still confusing or unknown to them. Our goal is not to simply be an answer site, but rather a site that promotes self-learning with some expert help along the way :). Please take a moment to edit your post with this additional detail, and it will likely be received more positively by our community. Thanks! $\endgroup$ – theforestecologist Aug 20 at 22:09
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It would help if you could delimit in which cellular of molecular context you would like to understand packing defect, for exemple during vesicular budding or lipid droplet biogenesis.

In the larger context of cellular membranes lipid packing defect occurs when there are transient "holes" made in the phophosolipid bilayer.

These packing defects can be caused by the chemical nature of the phospholipids present in the membrane. A phospholipid is chemically defined as an amphiphilic molecule: it contains a hydrophilic head and an hydrophobic tail. The head size can vary a lot between the different possibles groups (serine, choline, ethanolamine, etc). The size of the hydrophobic tail which is composed of long carbon chains can vary in length (typically 16-18 carbon atoms) and saturation. The saturation is very important because insaturated lipids (16:1, 18:1) tends to have to be kinked where the insaturation is.

Thus depending on the lipid composition of the membrane, it is possible to have micro domains (previously named lipid rafts) composed of only a specific lipid or group of lipid with a defined molecular composition. Packaging defects which called be name "holes" or imperfections in the membrane might occur at the boundaries of these microdomains because of the difference of the head size, length of the fatty acid chain, and saturation.

Many people also think that proteins can be responsible for the segregation of chemically defined lipids in the membrane and cause packaging defects for exemple proteins with an hairpin structure instead of a transmembrane domain, or proteins which interact with membranes with an amphipathic helix.

I hope this helps!

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