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1、AnalysingthechangesofaminoacidusagefrequenciesduringviridiplantaeevolutionBianChunxiang1,2Email:abzyme123@163.comRuanQiping1**CorrespondingauthorZhaoHong2LiaoMin21KeylaboratoryforMolecularBiologyandBiopharmaceuticals,MianyangNormalUniversity,Sichuan,621000,China2CollegeofLi
2、feSciencesandBiotechnology,MianyangNormalUniversity,Sichuan,621000,ChinaAbstractViridiplantaeareknowntooriginate（来源）fromonephylum（门）ofgreenalgae（海藻）,streptophytealgae,andformasingleevolutionarylineage.Theevolutionofviridiplantaemainlyfollowsthecoursefromtheearliestgreenalga
3、etobryophyte（苔藓）,pteridophytesandspermatophytes.Astheresultanalysisoftheirproteomes（蛋白质组）hasthepotentialofrevealing（透露真情的，启发人的）howaminoacidusagefrequencieswithinproteinshaveevolvedoverbiologicaltime.Inthepaper,655proteins(including452,672aa)ofsixproteomesfromgreenalgae(Chla
4、mydomonasreinhardtii;Ostreococcuslucimarinus),bryophyte(Physcomitrellapatens)andspermatophytes(Cryptomeriajaponica;Nicotianatabacum;Arabidopsisthaliana)wereanalysed.Theresultsshowedthatmostaminoacidusagefrequenciesdecreasing(especiallyAGVE)orincreasing(especiallyYFNIKS)foll
5、owfixedpatternsfromgreenalgaetobryophyteandspermatophytes.Byexploringdiscrepanciesofaminoacidusagefrequenciesamongtaxonomic（分类的）groups,itwasfoundthatthefrequenciesperformedabiggerchangewhenplantevolvedformalgaetobryophytethanthosefrombryophytetospermatophytes.Meanwhiledataa
6、lsoshowedthataminoacidresidues（剩余物，残渣）havethesimilarusagefrequenciesinspecieswithcloseevolutionarydistance.Inaddition,239proteins(including130,138aa)fromredalgaeproteomes(GuillardiathetaandHemiselmisandersenii)werealsoanalysed.Comparingwithgreenalgae,theseaminoacidfrequenci
7、eshavedistinctly（清楚地，无疑的）differences.ThefrequenciesofAGVRinredalgaeareextremelylowerthanthoseinviridiplantaewehavediscussed.Thestudieshint（暗示，提示）redalgaecannotfollowthepatternofgreenalgaetodecreasetheseaminoacids,whichhaveprovedindirectly（间接地）thefactthatembryophyte（有胚植物）ori
8、ginatedfromgreenalgaeratherthanredalgae.KeywordsAminoacids,usagefrequency,viridipl
