Glutenin and gliadin form a stretchy network during hydration and kneading
Wheat flour contains two proteins, glutenin and gliadin, that are inert when dry. Adding water causes these proteins to absorb moisture and begin bonding to each other, forming gluten strands. Physical action (kneading, mixing, stretching) aligns these proteins and strengthens the network. Well-developed gluten is elastic, extensible, and can trap large gas bubbles from fermentation without breaking.
The gluten network forms gradually: at 5 minutes of kneading, gluten is barely developed and dough is sticky and slack. At 10-15 minutes, gluten is well-developed and the dough becomes smooth and bouncy. Overworked dough (30+ minutes) begins to degrade as mechanical stress breaks apart the network; dough becomes less elastic and drier as the gluten strands shorten.
Gluten strength and dough handling balance extensibility and elasticity
High-gluten breads (like sandwich bread, bagels) use 13-14% protein flour and target strong gluten development for structure and open crumb. Low-gluten pastries (cake flour, biscuits) use 8-10% protein and minimize mixing to keep gluten weak, producing tender, crumbly textures. Long fermentation also affects gluten: the acids produced during fermentation partially break down gluten strands, making dough more extensible and less elastic. This is why high-hydration, long-fermented doughs (ciabatta, focaccia) can develop large gas bubbles without excessive kneading.