 Proteins can bind to other proteins as well as to small @-@ molecule substrates . When proteins bind specifically to other copies of the same molecule , they can oligomerize to form fibrils ; this process occurs often in structural proteins that consist of globular monomers that self @-@ associate to form rigid fibers . Protein – protein interactions also regulate enzymatic activity , control progression through the cell cycle , and allow the assembly of large protein complexes that carry out many closely related reactions with a common biological function . Proteins can also bind to , or even be integrated into , cell membranes . The ability of binding partners to induce conformational changes in proteins allows the construction of enormously complex signaling networks . Importantly , as interactions between proteins are reversible , and depend heavily on the availability of different groups of partner proteins to form aggregates that are capable to carry out discrete sets of function , study of the interactions between specific proteins is a key to understand important aspects of cellular function , and ultimately the properties that distinguish particular cell types . 
 Proteins can bind to other proteins as well as to small @-@ molecule substrates . When proteins bind specifically to other copies of the same molecule , they can oligomerize to form fibrils ; this process <a href='uninflect' title='1'><mark>occurs</mark></a> often in structural proteins <a href='null_relcl' title='2'><mark>that</mark></a>consist of globular monomers that self @-@ associate to form rigid fibers . Protein – protein interactions also regulate enzymatic activity , control progression through the cell cycle , and allow the assembly of large protein complexes <a href='null_relcl' title='3'><mark>that</mark></a>carry out many closely related reactions with a common biological function . Proteins can also bind to , or even be integrated into , cell membranes . The ability of binding partners to induce conformational changes in proteins <a href='uninflect' title='4'><mark>allows</mark></a> the construction of enormously complex signaling networks . Importantly , as interactions between proteins <a href='drop_aux' title='5'><mark>are</mark></a>reversible , and depend heavily on the availability of different groups of partner proteins to form aggregates <a href='null_relcl' title='6'><mark>that</mark></a><a href='drop_aux' title='7'><mark>are</mark></a>capable to carry out discrete sets of function , study of the interactions between specific proteins <a href='drop_aux' title='8'><mark>is</mark></a>a key to understand important aspects of cellular function , and ultimately the properties <a href='null_relcl' title='9'><mark>that</mark></a>distinguish particular cell types . 
Proteins can bind to other proteins as well as to small @-@ molecule substrates . When proteins bind specifically to other copies of the same molecule , they can oligomerize to form fibrils ; dis process occur often in structural proteins consist of globular monomers that self @-@ associate to form rigid fibers . Protein – protein interactions also regulate enzymatic activity , control progression through the cell cycle , and allow the assembly of large protein complexes carry out many closely related reactions wit a common biological function . Proteins can also bind to , or even be integrated into , cell membranes . The ability of binding partners to induce conformational changes in proteins allow the construction of enormously complex signaling networks . Importantly , as interactions between proteins reversible , and depend heavily on the availability of diffrent groups of partner proteins to form aggregates capable to carry outt discrete sets of function , study of da interactions between specific proteins a key to understand important aspects of cellular function , and ultimately tdaproperties distinguish particular cell types .