Glucogenesis Flashcards

1
Q

Substrato inicial

A

Glucosa 6-R

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2
Q

Comportamiento celular

A

Citosol

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3
Q

Transportadores en membrana celular

A

Hígado: GLUT 2: no dependientes de insulina
Músculo: GLUT 4

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4
Q

Primer paso

A

Glucosa pasa a glucosa 6 fosfato

Actúa glucocinasa
CatalizadorMg
ADP

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5
Q

Segundo paso

A

Glucosa 6-fosfato a glucosa 1-fosfato

Actúa e fosfoglucomutasa
Reversible

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6
Q

Tercer paso

A

Glucosa 1-fosfato a UDP glucosa/uridina difosfato glucosa

Actúa UDPGlc pirofosforilssa (quita dos grupo fosfatos al UDP y unir a la glucosa 1 fosfato

*cada difosfato de uridina aporta una glucosa para que se ensamble el glucógeno

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7
Q

Para formar la molécula de glucógeno se necesita un primer

A

Glucogenina: se autoglucosinarse (agrega cadena de glucosas)

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8
Q

Primer glucogenina tiene

A

7 a 12 glucosas

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9
Q

Quien agrega glucosa por glucosa

A

Glucógeno sintasa ocupa UDPgluc

Genera enlaces glucosidicos alfa 1-4 (CUARTO PASO)

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10
Q

Quinto paso

A

Desprendimiento de cadenas de glucosa existentes

Por enzima ramificadora

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11
Q

Después del desprendimiento por la enzima ramificadora pasa a

A

Glucogeno 1-6 alfa

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12
Q

Epinefrina

A

Busca inhibir a la proteína fosfatasa 1

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13
Q

Glucogeno sintasa

A

Insulina la activa
Epinefrina y glucagón inhiben promueven activación de glucofosforilasa (enzima que degrada glucógeno)

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14
Q

Ayuno elevado con glucagón y cortisol aumentan

A

CAMP se hidroliza y sale a la sangre

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15
Q

Enlace de residuo de glucosa sin marcase

A

1-4

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16
Q

Enlace de residuo ya marcado de glucosa

A

1-6