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A Monascus pilosus MS-1 strain with high-yield monacolin K but no citrinin
Feng, Yanli,Chen, Wanping,Chen, Fusheng 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.4
Monacolin K (MK) produced by Monascus spp. is mostly used to regulate cholesterol level, while it can be contaminated by citrinin, a mycotoxin yielded by some Monascus strains. To develop production of citrinin-free MK, an M. sp. MS-1 strain, identified as M. pilosus by morphologies and internal transcribed spacer sequences analysis, was isolated from red fermented rice. After 14 days of fermentation, yields of citrinin-free MK could be up to 0.58 mg/mL and 16.45 mg/g in liquid- and solid-state fermentation products under optimal conditions, respectively. Further determination revealed that no citrinin biosynthesis related genes such as ctnA, pksCT, ctnE, and ctnR were detected. Thus, HPLC combined with citrinin-related gene analyses can be used for rapid screening of non-citrinin production Monascus strains.
A Monascus pilosus MS-1 strain with high-yield monacolin K but no citrinin
Yanli Feng,Wanping Chen,Fusheng Chen 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.4
Monacolin K (MK) produced by Monascus spp. is mostly used to regulate cholesterol level,while it can be contaminated by citrinin, a mycotoxin yielded by some Monascus strains. To developproduction of citrinin-free MK, an M. sp. MS-1 strain, identified as M. pilosus by morphologies andinternal transcribed spacer sequences analysis, was isolated from red fermented rice. After 14 days offermentation, yields of citrinin-free MK could be up to 0.58 mg/mL and 16.45 mg/g in liquid- and solidstatefermentation products under optimal conditions, respectively. Further determination revealedthat no citrinin biosynthesis related genes such as ctnA, pksCT, ctnE, and ctnR were detected. Thus,HPLC combined with citrinin-related gene analyses can be used for rapid screening of non-citrininproduction Monascus strains.
Mthakathi, Ntsane Trevor,Kgosiemang, Ipeleng Kopano Rosinah,Chen, Wanping,Mohlatsane, Molikeng Eric,Mojahi, Thebeyapelo Jacob,Yu, Jae-Hyuk,Mashele, Samson Sitheni,Syed, Khajamohiddin The Korean Society of Phycology 2015 ALGAE Vol.30 No.3
Microalgae research is gaining momentum because of their potential biotechnological applications, including the generation of biofuels. Genome sequencing analysis of two model microalgal species, polar free-living Coccomyxa sp. C-169 and symbiotic Chlorella sp. NC64A, revealed insights into the factors responsible for their lifestyle and unravelled biotechnologically valuable proteins. However, genome sequence analysis under-explored cytochrome P450 monooxygenases (P450s), heme-thiolate proteins ubiquitously present in species belonging to different biological kingdoms. In this study we performed genome data-mining, annotation and comparative analysis of P450s in these two model algal species. Sixty-nine P450s were found in two algal species. Coccomyxa sp. showed 40 P450s and Chlorella sp. showed 29 P450s in their genome. Sixty-eight P450s (>100 amino acid in length) were grouped into 32 P450 families and 46 P450 subfamilies. Among the P450 families, 27 P450 families were novel and not found in other biological kingdoms. The new P450 families are CYP745-CYP747, CYP845-CYP863, and CYP904-CYP908. Five P450 families, CYP51, CYP97, CYP710, CYP745, and CYP746, were commonly found between two algal species and 16 and 11 P450 families were unique to Coccomyxa sp. and Chlorella sp. Synteny analysis and gene-structure analysis revealed P450 duplications in both species. Functional analysis based on homolog P450s suggested that CYP51 and CYP710 family members are involved in membrane ergosterol biosynthesis. CYP55 and CYP97 family members are involved in nitric oxide reduction and biosynthesis of carotenoids. This is the first report on comparative analysis of P450s in the microalgal species Coccomyxa sp. C-169 and Chlorella sp. NC64A.
Ntsane Trevor Mthakathi,Ipeleng Kopano Rosinah Kgosiemang,Wanping Chen,Molikeng Eric Mohlatsane,Thebeyapelo Jacob Mojahi,Jae-Hyuk Yu,Samson Sitheni Mashele,Khajamohiddin Syed 한국조류학회I 2015 ALGAE Vol.30 No.3
Microalgae research is gaining momentum because of their potential biotechnological applications, including the generation of biofuels. Genome sequencing analysis of two model microalgal species, polar free-living Coccomyxa sp. C-169 and symbiotic Chlorella sp. NC64A, revealed insights into the factors responsible for their lifestyle and unravelled biotechnologically valuable proteins. However, genome sequence analysis under-explored cytochrome P450 monooxygenases (P450s), heme-thiolate proteins ubiquitously present in species belonging to different biological kingdoms. In this study we performed genome data-mining, annotation and comparative analysis of P450s in these two model algal species. Sixty-nine P450s were found in two algal species. Coccomyxa sp. showed 40 P450s and Chlorella sp. showed 29 P450s in their genome. Sixty-eight P450s (>100 amino acid in length) were grouped into 32 P450 families and 46 P450 subfamilies. Among the P450 families, 27 P450 families were novel and not found in other biological kingdoms. The new P450 families are CYP745-CYP747, CYP845-CYP863, and CYP904-CYP908. Five P450 families, CYP51, CYP97, CYP710, CYP745, and CYP746, were commonly found between two algal species and 16 and 11 P450 families were unique to Coccomyxa sp. and Chlorella sp. Synteny analysis and gene-structure analysis revealed P450 duplications in both species. Functional analysis based on homolog P450s suggested that CYP51 and CYP710 family members are involved in membrane ergosterol biosynthesis. CYP55 and CYP97 family members are involved in nitric oxide reduction and biosynthesis of carotenoids. This is the first report on comparative analysis of P450s in the microalgal species Coccomyxa sp. C-169 and Chlorella sp. NC64A.