In my book, there is written something like this. The integral proteins pass into the lipid bilayer to different depths and establish hydrophobic bonds with lipid molecules. Some of the integral proteins run throughout the lipid bilayer. They are called tunnel proteins OR transmembrane proteins. My question is do all the transmembrane proteins have to have channel or tunnel for transport of materials?
Do all the transmembrane proteins have to have channel or tunnel for transport of materials?
Calling transmembrane proteins tunnel proteins is very misleading. There are a wide range of functions carried out by transmembrane proteins. I'd say the most famous example that don't include a tunnel are the GPCRs that have 7 transmembrane segments. These are used for passing information across a membrane by acting as a receptor to a molecule on one side causing a conformational change which causes an action on the other side of the membrane.
Here is a link to all the GO annotation held by UniProt on transmembrane proteins. There are 10s of millions of results including, but certainly not limited to tunnels and channels.