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Sterol

sterol

(Science: chemistry) Any steroid-based alcohol having a hydrocarbon (aliphatic) side-chain of 8-10 carbons at the 17-beta position and a hydroxyl group at the 3-beta position (therfore an alcohol).

cholesterol is a sterol. Because of its hydrophilic property at the -OH end and hydrophobicity at the hydrocarbon side chain, it can be incorporated into the lipid bilayers of the cytoplasmic membrane. However, sterols only exist in the cytoplasmic membranes of eukaryotes while in prokaryotes, virtually none have sterols in their membranes except mycoplasmas, a group of cell wall-less bacteria.


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Re: Home Work Question

Hi, another MCQ type question, for my engineer exam: Is albumin the main sterol transporter? I tend to say no, but I' not sure. For all I think I know, albumin transports thyroid hormones, but as to sterols, I have no idea...

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by AlbuminFred
Mon Jun 24, 2013 1:06 pm
 
Forum: General Discussion
Topic: Home Work Question
Replies: 12
Views: 4623

Mystery Molecule

Yep it does not seem to have the sterol structure (that includes the pentagonal ring) and that defines steroids (see plenty here: http://en.wikipedia.org/wiki/File:Steroidogenesis.svg). But your reasons to eliminates all the others are perfectly ...

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by canalon
Thu Oct 14, 2010 9:14 pm
 
Forum: Molecular Biology
Topic: Mystery Molecule
Replies: 5
Views: 9095

The Fiber Disease

... Vitamins, Porphyrin and chlorophyll metabolism" /product="magnesium chelatase subunit ChlI" Function Code:3.04 - Lipid Metabolism, Sterol biosynthesis " /product="3-hydroxy-3-methylglutaryl CoA reductase" "Catalyzes the only substrate-level phosphorylation in ...

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by Nadas Moksha
Sun Aug 27, 2006 2:40 pm
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5560038

The Fiber Disease

... and ...SEARCH RESULTS: http://www.ingentaconnect.com/search?database=1&title=Sterol%20Biosynthesis%20Inhibitors Where's TAM TAM? I wish he would write........

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by London
Tue Apr 11, 2006 4:52 pm
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5560038

it's by Mycotine or Virus?

Yup, you're right....remember you chemistry lesson.. cholesterol (suffix -sterol) means contains a steroid ring. The same thing happens to Brassinolide which is known as a hormone, Branosteroid, have a steroid ring. That's why Brassinosteroid also grouped ...

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by victor
Wed Oct 19, 2005 11:36 am
 
Forum: Botany Discussion
Topic: it's by Mycotine or Virus?
Replies: 16
Views: 6883
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