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6 Cards in this Set

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  • Back

Collagen

Trihelical fiber (three left hand helices woven together to form a secondary right helix)


-Makes up majority of extracellular matrix of connective tissue


-Important in providing strength and flexibility

Elastin

Component of extracellular matrix of connective tissue.


-Primary role is to stretch and recoil (spring-like) to original shape

Keratins

Intermediate filament proteins found in epithelial cells.


-Contribute to mechanical integrity of cell and function as regulatory proteins


-Primary protein in hair and nails

Actin

Makes up microfilaments and thin filaments in myofibrils (contractile threads in striated muscle cells).


-Most abundant protein in Eukaryotic cells


-Possess +/- sides, polarity allows for motor proteins to travel unidirectionally along an actin filament.

Tubulin

Makes up microtubules which provide structure, cause chromosome separation in mitosis & meiosis, and aid in intracellular transport (possess polarity, - end usually located adjacent to nucleus, + end usually in periphery of a cell)

Motif Structure/Organization

Also known as supersecondary structures are combinations of alpha-helices and beta-structures (repetitive organization of secondary structural elements) connected through loops, that form patterns that are present in many different protein structures.