CELL RESPIRATION
STRUCTURE OF THE MITOCHONDRION
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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: -Porins are beta barrel proteins that cross a cellular membrane and act as a pore, through which molecules can diffuse. Unlike other membrane transport proteins, porins are large enough to allow passive diffusion, i.e., they act as channels that are specific to different types of molecules.
Detailed explanation-2: -Outer membrane -barrel proteins (OMPs) are found in the outer membranes of Gram-negative bacteria, mitochondria, and chloroplasts (1). The functions of OMPs are versatile and often essential as they include transport of metabolites and toxins as well as membrane biogenesis (2).
Detailed explanation-3: -Porins are proteins present in the outer membranes of gram-negative bacteria that form channels to allow the entry of antibiotics. Reduction in the number of porins, decreases the influx of drugs into bacteria allowing them to develop resistance against different antimicrobials.
Detailed explanation-4: -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).