Disulfide

... (a major free radical-fighting enzyme) to revitalize vitamin E. Interestingly, Kukucka et. al. reported finding significant levels of oxytocin (a disulfide containing octapeptide) in isolated Leydig cells. Kukucka theorized in the introduction of his PhD dissertation (back in 1993) that open chain ...

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... this question is from a chemistry perspective: look up each type of bond in a chemistry book or on the internet and you will discover that disulfide bonds, being covalent, are the hardest, and therefore last to break. But that is a bit harder than asking for the answer

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To clarify: you are correct in your order, but disulfide bonds are exception to the 'rule'. They are covalent bonds and would break out of order.

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I agree with MisterATP for the most part, but the answer has to be disulfide bonds. Ionic interactions are the 1st to go, hydrogen and hydrophobic both support secondary structure, disulfide bonds are covalent and not easily destroyed by heat (if they are ...

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... and Golgi complex where than addition of lipids and carbohydrates take place and even the protein folding is done in ER by enzyme such as protein disulfide isomerase and carbohydrates are added by dolichol carrier. Is trafficking is done by means of trans & cis golgi complex by means of vesicles ...

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