INTRODUCTION TO MICROSCOPY CELL BIOLOGY
MITOCHONDRIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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proteins
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ATP
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integral proteins that have relatively large internal channel surrounded by a barrel of
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the what?
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Detailed explanation-1: -beta-Barrel proteins are found in the outer membranes of bacteria, mitochondria and chloroplasts. The presently known sizes range from small eight-stranded to large twenty-two-stranded beta barrels existing as monomers and oligomers.
Detailed explanation-2: -The “general diffusion porins” form aqueous channels with an exclusion limit of typically 600 Da and extremes of 5000 Da. Due to their high copy number they form the major integral protein component of the outer membrane and turn it into a molecular sieve.
Detailed explanation-3: -A distinctive feature is their ability to bind and transport small hydrophobic molecules in the barrel calyx. Examples of the family include retinol binding proteins (RBPs) and major urinary proteins (Mups).