Guss AM

References (2)

Title : Tandem chemical deconstruction and biological upcycling of poly(ethylene terephthalate) to beta-ketoadipic acid by Pseudomonas putida KT2440 - Werner_2021_Metab.Eng_67_250
Author(s) : Werner AZ , Clare R , Mand TD , Pardo I , Ramirez KJ , Haugen SJ , Bratti F , Dexter GN , Elmore JR , Huenemann JD , Peabody GLt , Johnson CW , Rorrer NA , Salvachua D , Guss AM , Beckham GT
Ref : Metab Eng , 67 :250 , 2021
Abstract : Poly(ethylene terephthalate) (PET) is the most abundantly consumed synthetic polyester and accordingly a major source of plastic waste. The development of chemocatalytic approaches for PET depolymerization to monomers offers new options for open-loop upcycling of PET, which can leverage biological transformations to higher-value products. To that end, here we perform four sequential metabolic engineering efforts in Pseudomonas putida KT2440 to enable the conversion of PET glycolysis products via: (i) ethylene glycol utilization by constitutive expression of native genes, (ii) terephthalate (TPA) catabolism by expression of tphA2(II)A3(II)B(II)A1(II) from Comamonas and tpaK from Rhodococcus jostii, (iii) bis(2-hydroxyethyl) terephthalate (BHET) hydrolysis to TPA by expression of PETase and MHETase from Ideonella sakaiensis, and (iv) BHET conversion to a performance-advantaged bioproduct, beta-ketoadipic acid (betaKA) by deletion of pcaIJ. Using this strain, we demonstrate production of 15.1 g/L betaKA from BHET at 76% molar yield in bioreactors and conversion of catalytically depolymerized PET to betaKA. Overall, this work highlights the potential of tandem catalytic deconstruction and biological conversion as a means to upcycle waste PET.
ESTHER : Werner_2021_Metab.Eng_67_250
PubMedSearch : Werner_2021_Metab.Eng_67_250
PubMedID: 34265401
Gene_locus related to this paper: idesa-mheth , idesa-peth

Title : The genome of M. acetivorans reveals extensive metabolic and physiological diversity - Galagan_2002_Genome.Res_12_532
Author(s) : Galagan JE , Nusbaum C , Roy A , Endrizzi MG , Macdonald P , FitzHugh W , Calvo S , Engels R , Smirnov S , Atnoor D , Brown A , Allen N , Naylor J , Stange-Thomann N , DeArellano K , Johnson R , Linton L , McEwan P , McKernan K , Talamas J , Tirrell A , Ye W , Zimmer A , Barber RD , Cann I , Graham DE , Grahame DA , Guss AM , Hedderich R , Ingram-Smith C , Kuettner HC , Krzycki JA , Leigh JA , Li W , Liu J , Mukhopadhyay B , Reeve JN , Smith K , Springer TA , Umayam LA , White O , White RH , Conway de Macario E , Ferry JG , Jarrell KF , Jing H , Macario AJ , Paulsen I , Pritchett M , Sowers KR , Swanson RV , Zinder SH , Lander E , Metcalf WW , Birren B
Ref : Genome Res , 12 :532 , 2002
Abstract : Methanogenesis, the biological production of methane, plays a pivotal role in the global carbon cycle and contributes significantly to global warming. The majority of methane in nature is derived from acetate. Here we report the complete genome sequence of an acetate-utilizing methanogen, Methanosarcina acetivorans C2A. Methanosarcineae are the most metabolically diverse methanogens, thrive in a broad range of environments, and are unique among the Archaea in forming complex multicellular structures. This diversity is reflected in the genome of M. acetivorans. At 5,751,492 base pairs it is by far the largest known archaeal genome. The 4524 open reading frames code for a strikingly wide and unanticipated variety of metabolic and cellular capabilities. The presence of novel methyltransferases indicates the likelihood of undiscovered natural energy sources for methanogenesis, whereas the presence of single-subunit carbon monoxide dehydrogenases raises the possibility of nonmethanogenic growth. Although motility has not been observed in any Methanosarcineae, a flagellin gene cluster and two complete chemotaxis gene clusters were identified. The availability of genetic methods, coupled with its physiological and metabolic diversity, makes M. acetivorans a powerful model organism for the study of archaeal biology. [Sequence, data, annotations and analyses are available at]
ESTHER : Galagan_2002_Genome.Res_12_532
PubMedSearch : Galagan_2002_Genome.Res_12_532
PubMedID: 11932238
Gene_locus related to this paper: metac-MA0077 , metac-MA0362 , metac-MA0419 , metac-MA0736 , metac-MA0993 , metac-MA1571 , metac-MA1856 , metac-MA1857 , metac-MA2002 , metac-MA2343 , metac-MA2629 , metac-MA2691 , metac-MA2743 , metac-MA2933 , metac-MA3611 , metac-MA3635 , metac-MA3920 , metac-META