Question

What is the structure of contractile protein explain?

Answer 1

Hello dear..........

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ᴄᴏɴᴛʀᴀᴄᴛɪʟᴇ ᴘʀᴏᴛᴇɪɴs. sᴋᴇʟᴇᴛᴀʟ ᴍᴜsᴄʟᴇ ɪs ᴄᴏᴍᴘᴏsᴇᴅ ᴏғ ᴍᴜsᴄʟᴇ ғɪʙᴇʀs ᴡʜɪᴄʜ ʜᴀᴠᴇ sᴍᴀʟʟᴇʀ ᴜɴɪᴛs ᴄᴀʟʟᴇᴅ ᴍʏᴏғɪʙʀɪʟs.

ᴛʜᴇʀᴇ ᴀʀᴇ ᴛʜʀᴇᴇ ᴛʏᴘᴇs ᴏғ ᴘʀᴏᴛᴇɪɴs ᴍᴀᴋᴇ ᴜᴘ ᴇᴀᴄʜ ᴍʏᴏғɪʙʀɪʟ; ᴛʜᴇʏ ᴀʀᴇ ᴄᴏɴᴛʀᴀᴄᴛɪʟᴇ, ʀᴇɢᴜʟᴀᴛᴏʀʏ ᴀɴᴅ sᴛʀᴜᴄᴛᴜʀᴀʟ ᴘʀᴏᴛᴇɪɴs.

ʙʏ ᴄᴏɴᴛʀᴀᴄᴛɪʟᴇ ᴘʀᴏᴛᴇɪɴs, ᴡᴇ ᴍᴇᴀɴ ᴀᴄᴛɪɴ (ᴛʜɪɴ ғɪʟᴀᴍᴇɴᴛ) ᴀɴᴅ ᴍʏᴏsɪɴ (ᴛʜɪᴄᴋ ғɪʟᴀᴍᴇɴᴛ).
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Answer 2

Actin and Myosin are the two Contractile Proteins:

Actin:

Actin consists of three components - F-actin, tropomyosin and troponin.

F- Actin has myosin binding site where myosin head attaches itself during muscle contraction.

In relaxed muscle tropomyosin covers myosin binding sites on actin and thus blocks attachment of myosin heads to actin.

During muscle contraction troponin removes tropomyosin from myosin binding sites on actin.

Myosin:

It consists of a globular head with a short cross arm and a tail.

The globular head is an active ATPase enzyme that has binding sites for actin and active sites for ATP.

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