1.#Biochemistry,#and# Thermodynamics#

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8/24/15BIOCH 755: Biochemistry IFall en#Office#Hour:#M#1:30 e:#785 2518#Overall#Course#Setup# Time%&%Loca on:%MWF#12:30 1:20#pm,#Burt#114#%Instructors:%#– Sec on%I:#Jianhan#Chen,#034#Chalmers,#532 2518,#jianhac@ksu.edu– Sec on%II:#Larry#Davis,#062#Chalmers,#532 6124,#ldavis@ksu.edu#– Sec on%III:#Gerald#Reek,#203#Burt,#532 6117,#reeck@ksu.edu## and#plan#accordingly#– Sec on#I:#Sep#28#(M)#during#the#class# me#– Sec on#II:#Nov#2#(M)#during#the#class# me#– Sec on#III:##Dec#16#(Wed)#4:10 6:00#PM#(In#the#finals#week)# Grading:#100#points#each#sec on;#the#final#leUer#grades#for#the#en es#from#all#three#sec ons#and#grading#on#a#curve.##(c)#Jianhan#Chen#2#1

8/24/15Sec on#I#Overview# ��#Sept#28#(M)#Mostly#cover#Chapters#1 2,#4 KSOL##– Be#prepared#to#take#good#notes#during#lectures# Office#hours:#M#1:30#–#2:30#PM,#Chalmers#034#– Or#by#appointment# pt#28#(Monday)#No#make han#Chen#3#(c)#Jianhan#Chen#4#2

8/24/15Which of the following fields isbiochemistry NOT relevant to?A.B.C.D.E.ImmunologyNutritionKinesiologyWaste managementBrewingWhich of the following elements is mostabundant (in % weight) in the human body?A.B.C.D.E.HONCBoth H and C are equally abundant3

8/24/15To what class does the followingcompound belong?A.B.C.D.LipidCarbohydrateAmino acidNucleotideWhich#of#the#following#func .B.C.D.aminocarboxylhydroxylaldehyde4

8/24/15To what class of moleculedoes the following belong?A.B.C.D.CarbohydrateLipidAmino acidNucleotideBIOCH 755: Biochemistry IFall en#Office#Hour:#M#1:30 e:#785 2518#5

8/24/15Biochemistry# Chemistry#of#life#– les#– Interac on#of#biomolecules#– Synthesis#and#degrada on#of#biomolecules#(metabolism)#– Energy#genera on#and#consump on#– Regula on#of#biomolecules#– Gene c#informa on#storage,#transla on,#and#propaga on# Highly#interdisciplinary# Direct#implica Introduc on#to#the#Chemistry#of#Life# Key%Concepts%1.1:%%– d#number#of#elements.#– Certain#func ypes#of####biomolecules.#– During#chemical#evolu x#molecules#and#polymers.#– Self replica lec on.#(c)#Jianhan#Chen#12#6

8/24/15Human#Body#Mass#Composi nhan#Chen#14#7

n#Chen#15#Biological#Polymers# ough#condensa on#reac ons#of#various#monomers# Two#extremely#important#outcomes:#– Exponen ally#increase#in#the#chemical#versa lity#(NM)#– Possibility#of#replica on#(informa on#storage,#propaga on#&#evolu on)!#(c)#Jianhan#Chen#16#8

8/24/15Condensa on#and#Hydrolysis#(c)#Jianhan#Chen#17#Replica on:#Muta on#&#Evolu on#(c)#Jianhan#Chen#18#9

e Obeys Thermodynamics10

8/24/151.3.#Thermodynamics# nthalpy#and#the#change#in#entropy#(ΔG# #for#a#reac concentra s#(ΔG# e#condi ons#as#a#temperature#of#25 avorable#reac # Only#changes#can#be#measured#ΔE q wdE δq - δw If#only#P#dV#work#(expansion#or#contrac on)#done:# dE δq - PdV δqif constant VΔE qv – change!#(c)#Jianhan#Chen#22#11

8/24/15First#Law#of#Thermodynamics# Conserva ergy#(E)#ΔE q wdE δq - δw Internal#energy#(E)# – State#Func ath#of#arrival#– Microscopically:#mul ple#contribu ons#including:#kine c,#vibra onal,#rota onal,#(chemical)#bonding,#non bonded#interac ochemistry)#components#– Macroscopically:#only#definable#on#rela about#heat#measured#in#more# natural #setngs#with#constant#pressure?### s#with#PV#work#exchange#with#environment:##dE δq - PdV– hange!## Need#to#introduce#the#concept#of#enthalpy:#H# #E# #PV#– ut#other#types#of# work#done)#is#the#enthalpy#change!## Biochemical#reac ons#in#solu on#(NPT#condi on)#– Volume#change#is#minimal#(ΔV# #0)#– dH# #dE# #PΔV# #dE#– ternal#energy##(c)#Jianhan#Chen#24#12

8/24/15Energy#dictates#the#direc on#of#many#processes# ##but#not#always#ΔE #the#direc #of#Thermodynamics# n#an#irreversible#process## #higher#temperature #(Rudolf#Clausius)#– #the#absorp rsion#into#work .#(Lord#Kevin #– #– Existence#of#absolute#zero#temperature#(T# #0#K)# Third#law#of#thermodynamics:#S# #0#at#T# #0#for#perfect#crystals.#(c)#Jianhan#Chen#26#13

8/24/15Entropy# lability#of#a#system s#energy#to#do#work#(S qrev/T).# n#the#context#of#sta s cal#mechanics#– A#sta s tate#(lex#equa on)#– A#measure#of#uncertainty#(from#informa on#theory)#(right#equa on)#S k B pi ln piS kB ln WikB: Boltzmann’s constantW: number of microscopic statepi: probability of a microscope state esses# Both#enthalpy#and#entropy#maUer#(normal/NPT#condi on)# Gibbs#free#energy:#ΔG# #ΔH#–#T#ΔS# )#Jianhan#Chen#28#14

8/24/15Enthalpy#and#Entropy#Compensa on#Enthalpy ΔG# #ΔH#–#TΔS# ativeΔHf# #0###ΔSf# #0#1. Low#temperature,#ΔGf# #ΔHf#–#TΔSf# #0#(folding)#(the#favored#state#is#not#the#more# random #denatured#state!)##2. At#folding#temperature#Tm,#ΔGf# #0#(pf# #pu# #0.5)#3. High#temperature,#ΔGf# #ΔHf#–#TΔSf# nstant# Remember#that#given#a#reac on:### # # # # # #A# #B# #C# #D##the#quan ty:#K# rred#to#as#an# equilibrium#constant .#But#why#a#constant?## Proof:##First,#needs#to#define#a# standard#state #(commonly#298K,#1atm,#1M).#Then#for#a#solu on#with#a#concentra on#[A],#####G# #G0# #RT#ln#([A]/[A]0)# #G0# #RT#ln#[A]# Therefore,ΔG# #ΔG0# #RT#ln#([C][D]/[A][B])# At#equilibrium,#ΔG# #0.#Thus,#####ΔG0# #RT#ln#([C][D]/[A][B])# #0#####ΔG0# # #RT#ln#K#####K# ##[C][D]/[A][B]# #exp#(# #ΔG0/RT)##(c)#Jianhan#Chen#30### 15

8/24/15Thermochemistry# Experimental#determina H#and#ΔS.## ΔG#can#be#directly#calculated#from#Keq#– Oxen#done#by#fitng#to#a# tra on#curve#– ding#or#(bio )chemical#reac on# Determina on#of#ΔH#and#ΔS#– Van t#Hoff#Rela onship#– Calorimetry#– Theory#and#simula on:#not#reliable#at#quan ta ve#level#(c)#Jianhan#Chen#31#Van t#Hoff#Rela onship# The#classical#approach,#require#mul #and#certain#assump ons#lnK eq ΔG 0ΔH 0 ΔS 0 RTRTR Assuming#that#ΔH#and#ΔS#are#temperature# independent#(oxen#a#strong#assump on#in#biochemical/biophysical#processes# # safer #to#calculate#ΔS (ΔH ΔG)/R#(c)#Jianhan#Chen#32#16

8/24/15Biosphere:Energy Flow in an Open SystemSummary# ymers,Key,concepts,of,thermodynamics, Coming,up:,water,and,what,is,special,about,it,3417

8/24/15Which of the following is not true forbiochemical standard conditions?A. The concentrations of reactants and productsis 1M.B. The concentration of hydrogen ions is 1M.C. Temperature is 25oC/298K.D. Pressure is 1 atmosphere.18

ochemistry”,#4th#Ed.,# 65:#Biochemistry#II#in# Spring#2016).# rdingly# – Sec on#I:#Sep#28#(M)#during#th

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