1.Survey of post-discharge exercise behavior and analysis of factors influencing exercise intensity in patients undergoing lung surgery
Hongyu ZENG ; Xiang WANG ; Tian ZHANG ; Yaqin WANG ; Xing WEI ; Zhen DAI ; Liping ZHANG ; Xiaoqin LIU ; Qiang LI ; Qiuling SHI ; Wei DAI ; Jia LIAO
Chinese Journal of Clinical Thoracic and Cardiovascular Surgery 2026;33(05):734-742
Objective To investigate the post-discharge exercise behavior and factors influencing moderate to vigorous intensity physical activity (MVPA) in patients undergoing lung surgery. Methods A total of 2874 patients from the large prospective, observational perioperative lung symptom study cohort (CN-PRO-Lung 3) in the Department of Thoracic Surgery at Sichuan Cancer Hospital between April 7, 2021, and January 31, 2024, were selected as the survey subjects. A survey was conducted using the Investigation of Exercise Behavior after Lung Surgery questionnaire and the International Physical Activity Questionnaire-Short Form (IPAQ-SF) among patients who underwent lung surgery. Binary logistic regression was used to analyze the factors influencing patients’ engagement in MVPA. Results A total of 702 patients were surveyed, including 252 males and 450 females, with an average age of (52.4±10.2) years. Patients with lung cancer accounted for 85.9%. Only 36.0% of the patients had regular exercise habits, while 42.3% did not engage in any physical activity. The three main barriers for postoperative exercise were physical discomfort (pain, coughing, shortness of breath, etc, 54.7%), lack of professional guidance (41.7%), and concerns about the surgical wound (28.9%). The proportions of patients engaging in vigorous, moderate, and low-intensity physical activity were 5.7%, 28.2%, and 66.1%, respectively. Multivariate analysis showed that patients with a personal annual income ≥50000 yuan (OR=1.52, 95%CI 1.01-2.29, P=0.044), high school education or above (OR=1.92, 95%CI 1.33-2.76, P<0.001), and lobectomy (OR=1.44, 95%CI 1.02-2.03, P=0.037) engaged in more MVPA. Conclusion Patients undergoing lung surgery have inadequate physical activity after discharge, particularly lacking in MVPA. Patients with higher income, higher educational levels, and lobectomy are more frequently engaged in MVPA. Measures such as symptom control, providing exercise guidance, and enhancing education on wound care may potentially improve the inadequate physical activity in lung surgery patients after discharge.
2.A Large-Scale Observational Centralized Monitoring Study on the Clinical Use and Safety of Traditional Chinese Medicine Formula Granules
Chengfeng WU ; Yaqin TANG ; Dan LI ; Jiabao LIAO ; Kaiwei HUANG ; Yanmei WU ; Zhongqi YANG
Journal of Traditional Chinese Medicine 2026;67(20):2187-2194
ObjectiveTo evaluate the safety and clinical utilization of traditional Chinese medicine (TCM) formula granules based on real-world data, and to provide evidence for their rational clinical use. MethodsA multicenter, prospective, open-label, observational centralized monitoring study was conducted. Participants who received TCM formula granules in 293 medical institutions throughout China from February 5th, 2020 to May 20th, 2025 were consecutively enrolled. The year of data collection was used as the stratification factor. Demographic characteristics (including sex, age, and concomitant medication use), information on TCM formula granule use (including mean prescribed dosage and inappropriate use), and adverse event(AE)/adverse drug reaction(ADR) occurrence and related factors were collected and statistically analyzed. ResultsA total of 42 011 participants were included in the safety set (SS), with a mean age of (38.34±22.30) years, including 18 693 males and 23 318 females. Among them, 3519 participants (8.38%) had a history of or concomitant diseases. The three most common comorbidities were hypertension (1189 cases, 33.79%), diabetes mellitus (850 cases, 24.15%), and coronary heart disease (471 cases, 13.38%). The top three diagnostic categories were respiratory, thoracic, and mediastinal diseases (7008 cases, 16.68%), infectious and parasitic diseases (6591 cases, 15.69%), and gastrointestinal diseases (4580 cases, 10.90%).Among 41 961 participants with available concomitant medication data, 3332(7.94%) received concomitant medications, and western medicines were the most commonly used concomitant medications (2819 cases, 6.72%). The mean prescribed dosage of TCM formula granules (expressed as the equivalent dosage of crude herbal pieces) was (158.23±104.86) g in 2020, (131.70±65.84) g in 2021, (130.62±59.96) g in 2022, (86.74±50.61) g in 2023, (118.59±52.01) g in 2024, and (134.38±49.43) g in 2025. The five most frequently prescribed toxic herbs were Kuxingren (Semen Armeniacae Amarum, 2746 cases, 6.54%), Xixin (Radix et Rhizoma Asari, 2193 cases, 5.22%), processed Kuxingren (862 cases, 2.05%), Baiqucai (Herba Chelidonii, 747 cases, 1.78%), and Wuzhuyu (Fructus Evodiae, 645 cases, 1.54%). Prescriptions involving incompatible combinations of the "eighteen antagonisms" and the "nineteen mutual inhibitions" were most frequently observed in 2020 (54 cases, 0.503%), and then decreased markedly, remaining at zero or an extremely low level thereafter. The overall incidence of adverse drug reactions (ADRs) associated with TCM formula granules was 0.057% (24 cases), indicating a rare occurrence. The annual incidence was 0.028% (3 cases) in 2020, 0 in both 2021 and 2022, 0.065% (5 cases) in 2023, 0.158% (15 cases) in 2024, and 0.226% (1 case) in 2025. Among the 24 patients who experienced ADRs, 15 had inappropriate medication use.Five of the 24 patients used toxic herbs, and all five had inappropriate medication. Multivariate logistic regression analysis showed that no history of drug-related adverse reactions [OR=0.053, 95%CI(0.006, 0.465)] and no concomitant medication [OR=0.315, 95%CI(0.109, 0.911)] were associated with a lower risk of ADRs. ConclusionTCM formula granules are widely used in clinical practice and exhibit a favorable overall safety. Greater attention should be paid to people with a history of drug-related adverse reactions and those receiving concomitant medications to further improve medication safety.
3.Value of ITGAM and ITGB2 levels in peripheral blood mononuclear cells in the diagnosis and prognosis evaluation for patients with severe acute pancreatitis complicated with acute lung injury
Xianbiao XU ; Jie SHAO ; Mingfang YANG ; Ruidan LI ; Yaqin WANG ; Li ZHANG
International Journal of Laboratory Medicine 2025;46(8):904-909
Objective To investigate the value of integrin subunit αM(ITGAM)and integrin subunit β2(ITGB2)levels in peripheral blood mononuclear cells(PBMC)in the diagnosis and prognosis evaluation for patients with severe acute pancreatitis(SAP)complicated with acute lung injury(ALI).Methods A total of 205 patients with SAP admitted from November 2022 to February 2024 in the hospital were selected,and they were divided into ALI group(103 cases)and non-ALI group(102 cases)according to whether they were com-plicated with ALI.Meanwhile,110 healthy people who underwent the physical examination were selected as the control group.The differences of the levels of ITGAM and ITGB2 in PBMC in different groups were com-pared.Logistic regression was used to analyze the influencing factors for ALI in patients with SAP.The re-ceiver operating characteristic(ROC)curve was used to analyze the diagnostic value of levels of ITGAM and ITGB2 in PBMC for SAP patients complicated with ALI and the predictive value for poor prognosis.Results The levels of ITGAM,ITGB2 in PBMC,and serum amylase and urine amylase levels in ALI group were higher than those in non-ALI group and control group(P<0.05).Multivariate Logistic regression anal-ysis showed that the increase of ITGAM,ITGB2 and serum amylase levels were risk factors for ALI in pa-tients with SAP(P<0.05).ROC curve results showed that the area under the curve(AUC)of ITGAM com-bined with ITGB2 in diagnosing ALI in patients with SAP was significantly higher than those of ITGAM and ITGB2 alone(P<0.05).The levels of ITGAM and ITGB2 in PBMC in the poor prognosis group were higher than those in the good prognosis group(P<0.05).ROC curve results showed that the AUC of ITGAM com-bined with ITGB2 in predicting poor prognosis in patients with SAP complicated with ALI was significantly higher than those of ITGAM and ITGB2 alone(P<0.05).Conclusion Increased levels of ITGAM and IT-GB2 in PBMC are risk factors for ALI in patients with SAP.ITGAM combined with ITGB2 has a good predic-tive efficacy for the poor prognosis in patients with SAP complicated with ALI,which has important value in clinical practice and is expected to become potential biomarkers.
4.Relationships of serum levels of vascular endothelial growth factor,transforming growth factor-β,interleukin-1,and interleukin-6 with clinicopathological features in patients with endometrial cancer
Yaqin YANG ; Jiahui LI ; Liping ZHAO
Journal of Clinical Medicine in Practice 2025;29(15):12-16
Objective To analyze the changes in serum levels of cancer-associated fibroblast-re-lated factors[vascular endothelial growth factor(VEGF),transforming growth factor-β1(TGF-β1)]and inflammatory mediators[interleukin-1(IL-1),interleukin-6(IL-6)]in patients with endometrial cancer(EC)and their relationship with clinicopathological features.Methods A total of 180 pa-tients with EC were selected as EC group,and 100 patients with benign endometrial lesions who visi-ted the hospital during the same period were selected as control group.The serum levels of VEGF,TGF-β1,IL-1 and IL-6 were compared between the two groups,as well as among EC patients with different clinicopathological features.Spearman correlation analysis was used to examine the relation-ship between the above-mentioned serum indicators and clinicopathological features in EC patients.Results The serum levels of VEGF,TGF-β1,IL-1 and IL-6 in the EC group were higher than those in the control group,with statistically significant differences(P<0.05).The serum levels of VEGF,TGF-β1,IL-1 and IL-6 in EC patients with a myometrial invasion depth ≥ 1/2 and lymph node metas-tasis were higher than those in EC patients with a myometrial invasion depth<1/2 and no lymph node metastasis(P<0.05).Spearman correlation coefficient analysis showed that the serum levels of VEGF,TGF-β1,IL-1 and IL-6 in EC patients were positively correlated with myometrial invasion depth and lymph node metastasis status,respectively(P<0.05).Conclusion The serum levels of VEGF,TGF-β1,IL-1 and IL-6 are significantly elevated in EC patients.These indicators are sig-nificantly correlated with clinicopathological features and have potential value in the early diagnosis,prognosis assessment,and targeted therapy of EC.
5.Combined analysis of differential miRNAs between amniotic fluid exosomes and placenta in Down syndrome fetuses
Yaqin Zhang ; Zhongrui Ma ; Yuan Qian ; Junjun Li ; Xingli Deng
Acta Universitatis Medicinalis Anhui 2025;60(6):1140-1148
Objective :
To analyze the differential expression profile of miRNAs in amniotic fluid exosomes of fetu- ses with Down syndrome (DS) and provide insights for identifying novel biomarkers for the prenatal diagnosis of DS .
Methods :
Amniotic fluid samples were collected from fetuses with DS and chromosomally normal fetuses . Exo- somes were isolated from the amniotic fluid and subjected to high-throughput sequencing. Differentially expressed miRNAs were identified , and target genes were predicted using TargetScan and miRanda. Target genes located on chromosome 21 were selected , and their biological functions and associated diseases were analyzed using Gene- Cards , HGNC , NCBI Gene , UniProtKB/Swiss-Prot , Ensembl , and OMIM databases . GO and KEGG enrichment analyses were performed to investigate the biological functions of the enriched genes .
Results :
A total of 59 differ- entially expressed miRNAs were identified , including 31 upregulated and 28 downregulated miRNAs . Based on a fold change > 2 and P < 0. 05 , 10 upregulated and 9 downregulated miRNAs with the highest expression levels were selected . Key miRNAs included hsa-let-7b-5p , hsa-let-7c-5p , hsa-let-7b-3p _ 1ss22CT , and hsa-miR-199b-5p , with BACH1 and IFNAR1 identified as their shared target genes . GO analysis revealed that the enriched target genes were primarily involved in protein binding , metal ion binding , transferase activity , DNA binding , transcriptional regulation by RNA polymerase Ⅱ , and nucleotide binding. KEGG pathway analysis indicated that the target genes were mainly associated with metabolic pathways , cancer-related pathways , the PI3K-Akt signaling pathway , and the Rap1 signaling pathway .
Conclusion
Differential expression of miRNAs in amniotic fluid exosomes was ob- served between DS fetuses and those with normal karyotypes . Combined analysis with placental miRNAs revealed hsa-miR-199b-5p as a common differentially expressed miRNA in both DS amniotic fluid and placenta. It is hypoth- esized that BACH1 and IFNAR1 , shared target genes of hsa-miR-199b-5p , hsa-let-7b-5p , hsa-let-7c-5p , and hsa- let-7b-3p_1ss22CT , may play a role in the pathogenesis of DS .
6.Risk factors for new-onset atrial fibrillation after off-pump coronary artery bypass grafting: A systematic review and meta-analysis
Xingxing CHEN ; Li YANG ; Yunqing GU ; Yinghong LI ; Yaqin CHENG ; Hui WANG
Chinese Journal of Clinical Thoracic and Cardiovascular Surgery 2025;32(10):1478-1486
Objective To systematically evaluate the risk factors for new-onset atrial fibrillation (NOAF) after off-pump coronary bypass grafting (OPCABG). Methods PubMed, EMbase, Web of Science, The Cochrane Library, Wanfang data, CBM, VIP, and CNKI databases were systematically searched by computer to collect studies related to the risk factors for NOAF after OPCABG from the establishment of the database to July 2023. Literature screening and quality evaluation were conducted independently by two researchers. The Newcastle-Ottawa Scale (NOS) was used to evaluate the quality of the literature. RevMan 5.3 and Stata15.0 were used for meta-analysis. Results Finally, 19 case-control studies related to the risk factors for NOAF after OPCABG were included, all of which were high-quality literature with NOS score≥6 points, with a total of 7019 subjects. The results of meta-analysis showed that the following factors were associated with NOAF after OPCABG: (1) the patient’s own factors: age (MD=3.51, 95%CI 2.39 to 4.63, P<0.01); (2) preoperative factors: history of hypertension (OR=1.17, 95%CI 1.04 to 1.32, P=0.01), history of myocardial infarction (OR=1.21, 95%CI 1.06 to 1.38, P<0.01), history of percutaneous coronary intervention (OR=2.22, 95%CI 1.03 to 4.77, P=0.04), EuroSCOREⅡ score (MD=0.59, 95%CI 0.25 to 0.94, P<0.01), low-density lipoprotein (MD=0.11, 95%CI 0.02 to 0.20, P=0.02), left atrial diameter (MD=1.64, 95%CI 0.24 to 3.04, P=0.02); (3) postoperative and treatment factors: left ventricular end-diastolic diameter (MD=1.16, 95%CI 0.33 to 1.99, P<0.01), left ventricular ejection fraction (MD=0.90, 95%CI 0.07 to 1.73, P=0.03), mechanical ventilation time (MD=2.78, 95%CI 1.65 to 3.90, P<0.01), B-type natriuretic peptide (MD=219.67, 95%CI 27.46 to 411.88, P=0.03), ICU retention time (MD=7.07, 95%CI 5.64 to 8.50, P<0.01). Conclusion The existing evidence shows that age, history of hypertension, history of myocardial infarction, history of percutaneous coronary intervention, preoperative EuroSCOREⅡscore, preoperative low-density lipoprotein, preoperative left atrial diameter, postoperative left ventricular end-diastolic diameter, postoperative left ventricular ejection fraction, postoperative mechanical ventilation time, postoperative B-type natriuretic peptide, and postoperative ICU retention time are risk factors for NOAF after OPCABG. Clinical attention should be paid to the above factors to achieve early identification, thereby reducing the incidence of NOAF after OPCABG and improving the clinical prognosis of patients.
7.Study on the application of dynamic transfer model-based training transfer intervention in standardized training of newly recruited nurses
Sisi LI ; Dandan SHAN ; Yaqin ZHANG
Chinese Journal of Practical Nursing 2025;41(18):1384-1392
Objective:To explore the effect of training transfer intervention based on dynamic transfer model (DTM) on standardized training for newly recruited nurses, and to provide reference for the establishment of standardized training transfer intervention strategies for newly recruited nurses.Methods:The quasi-experimental method was used in this study.The convenience sampling method was used to select the newly recruited nurses of Zhengzhou Central Hospital Affiliated to Zhengzhou University as the research subjects.According to the entry time, the newly recruited nurses in July 2020 were selected as the control group ( n=50), and the training and effect evaluation was carried out according to the hospital regulations and "training syllabus for newly recruited nurses (trial)". The newly recruited nurses in July 2021 were taken as the experimental group ( n=60), and on the basis of the control group, the experimental group implemented the DTM training transfer intervention program for training. The scores of personal training transfer effect, general self-efficacy and organizational training transfer atmosphere were compared between the two groups immediately, 3 months and 6 months after training. Results:There were 11 males and 39 females in the control group; aged (24.80 ± 2.11) years old.And there were 14 males and 46 females in the experimental group;aged (24.40 ± 1.75) years old.After training, the total score of transfer effect of individual training in experimental group was (17.73 ± 1.56), (19.47 ± 1.92) and (22.30 ± 1.49) immediately after training, at 3 months and 6 months after training, and (15.84 ± 1.57), (15.98 ± 1.55) and (16.08 ± 1.55) in the control group respectively. The differences were statistically significant ( t=-6.32, -10.36 and -21.42, all P<0.05). Before and after the two groups of training, there were statistically significant differences among groups, within groups, and interactions ( F=137.10, 241.64 and 170.17, all P<0.05). After training, the general self-efficacy scores of the experimental group were (27.10 ± 1.81), (28.03 ± 1.85) and (29.05 ± 1.70) immediately after training, at 3 months and 6 months, respectively, which were higher than (26.28 ± 2.42), (26.36 ± 2.86) and (26.90 ± 2.87) of the control group. The differences were statistically significant ( t=-2.03, -3.95 and -4.87, all P<0.05). Before and after the two groups of training, there were statistically significant differences among groups, within groups and interactions ( F=7.64, 71.26 and 30.25, all P<0.05). After training, the total organizational training transfer atmosphere scores of the experimental group were (39.35 ± 1.96), (50.38 ± 3.17) and (51.47 ± 3.28) immediately after training, respectively, higher than (38.08 ± 2.63), (38.48 ± 2.36) and (38.66 ± 2.27) of the control group. The differences were statistically significant ( t=-2.89, -21.94 and -23.35, all P<0.05), and before and after the two groups of training, there were statistically significant differences among groups, within groups, and interactions ( F=419.75, 261.56 and 207.99, all P<0.05). Conclusions:DTM-based training transfer intervention can improve the effect of personal training transfer, enhance the sense of self-efficacy and create a positive atmosphere of organizational training transfer, and effectively guide new nurses to apply the learning content to clinical practice after standardized training, and improve the effect of training transfer.
8.Predictive value of neutrophil/lymphocyte ratio in the prognosis of primary biliary cholangitis
Huiling ZHU ; Mengyao ZHENG ; Wenbin LI ; Yaqin HUANG ; Lili ZHANG ; Wenting YANG ; Min ZHOU ; Jinhui YANG
Chinese Journal of Hepatology 2025;33(7):652-659
Objective:To predict pre-treatment clinical parameters that are associated with poor response and prognosis to ursodeoxycholic acid (UDCA) in patients with primary biliary cholangitis (PBC) and to use second-line treatment drugs in the early stages to delay the progression of the disease so that patients can benefit from early-stage treatment.Methods:Patients diagnosed with PBC at the Second Affiliated Hospital of Kunming Medical University from 2013 to 2022 were collected. Two hundred fifty-seven cases were screened in accordance with the inclusion and exclusion criteria. The response and prognosis conditions one year after treatment were followed up in outpatient and inpatient departments, as well as through telephone calls. Statistical analyses were performed using t-tests, Mann-Whitney U test, χ2 test, Fisher's exact test, and logistic regression analysis according to different data. Results:A total of 257 PBC cases were included, with 223 females (86.80%) and 34 males (13.20%). Univariate and multivariate binary logistic regression analyses showed that baseline high albumin levels [odds ratio ( OR): 0.882, 95% confidence interval ( CI): 0.805~0.967, P=0.008] were a protective factor for PBC patients' response to UDCA treatment after adjusting for different confounding factors, while baseline high alkaline phosphatase ( OR: 1.012, 95% CI: 1.008~1.016, P<0.001) and baseline high neutrophil/lymphocyte ratio (NLR) level ( OR: 1.462, 95% CI:1.079~1.981, P=0.014) were risk factors for a poor response to UDCA. Trend analysis showed that the baseline NLR quantile was positively correlated with the risk of poor response to UDCA ( OR: 5.512, 95% CI: 1.040~29.216, P=0.045) in patients with PBC. Cox proportional hazards regression analysis identified that age [hazard ratio ( HR): 1.050, 95% CI: 1.019~1.082] and NLR value ( HR:1.089, 95% CI:1.021~1.161) were independent influencing risk factors for all-cause mortality in PBC patients ( P<0.05). Conclusion:Baseline high albumin levels are protective factors against a poor biochemical response to UDCA, while baseline high alkaline phosphatase levels and high NLR are risk factors for a poor biochemical response to UDCA in patients with PBC. Additionally, baseline high NLR values are positively correlated with poor biochemical response to UDCA treatment.
9.Loss-of-function MAVS mutation causes antiviral immunodeficiency:unveiling a novel mechanism linking viral infection to generalized pustular psoriasis in children
Yanan SUN ; Jiahong ZHOU ; Yaqin LIU ; Juan YANG ; Shasha MENG ; Hongmei LI ; Weihui ZHOU
Journal of Army Medical University 2025;47(23):2953-2962
Objective To investigate the role of mitochondrial antiviral signaling protein(MAVS)in viral infection-triggered generalized pustular psoriasis(GPP)in children.Methods This retrospective case-control study enrolled 80 GPP patients aged 0~18 years from Children's Hospital of Chongqing Medical University(from October 2013 to April 2019).Whole-exome sequencing identified rare MAVS variants associated with GPP.Pathogenicity of variants was predicted using Mutation Taster,Disease Association,SIFT,and CADD bioinformatics tools.Sanger sequencing validated variants,followed by construction of wild-type(WT)and mutant MAVS expression plasmids transfected into HEK 293 cells.Protein expression was assessed by Western blot.Dual-luciferase reporter gene assays measured IFNB1 and NF-κB transcriptional activity.Genotype distribution of the MAVS c.171dupT/p.H57fs variant was analyzed using Fisher's exact test.Results This study enrolled 80 pediatric GPP patients(aged 0~18 years).Whole-exome sequencing identified five rare MAVS variants,with bioinformatics analyses predicting deleterious effects on protein stability and function.Western blot demonstrated that the c.171dupT mutation in GPP patients significantly reduced full-length MAVS expression(P<0.001);dual-luciferase assays further revealed this variant impaired MAVS-mediated IFNB1 transcriptional activation by 85%(P<0.001),abrogated NF-κB signaling pathway activation(P<0.001),but exhibited no dominant-negative effect on wild-type MAVS function(P>0.05).Conclusion The MAVS c.171dupT frameshift variant may contribute to infection-triggered GPP in children,suggesting its potential as a genetic biomarker for GPP susceptibility.
10.A CYP80B enzyme from Stephania tetrandra enables the 3'-hydroxylation of N-methylcoclaurine and coclaurine in the biosynthesis of benzylisoquinoline alkaloids.
Yaoting LI ; Yuhan FENG ; Wan GUO ; Yu GAO ; Jiatao ZHANG ; Lu YANG ; Chun LEI ; Yun KANG ; Yaqin WANG ; Xudong QU ; Jianming HUANG
Chinese Journal of Natural Medicines (English Ed.) 2025;23(5):630-640
Benzylisoquinoline alkaloids (BIAs) are a structurally diverse group of plant metabolites renowned for their pharmacological properties. However, sustainable sources for these compounds remain limited. Consequently, researchers are focusing on elucidating BIA biosynthetic pathways and genes to explore alternative sources using synthetic biology approaches. CYP80B, a family of cytochrome P450 (CYP450) enzymes, plays a crucial role in BIA biosynthesis. Previously reported CYP80Bs are known to catalyze the 3'-hydroxylation of (S)-N-methylcoclaurine, with the N-methyl group essential for catalytic activity. In this study, we successfully cloned a full-length CYP80B gene (StCYP80B) from Stephania tetrandra (S. tetrandra) and identified its function using a yeast heterologous expression system. Both in vivo yeast feeding and in vitro enzyme analysis demonstrated that StCYP80B could catalyze N-methylcoclaurine and coclaurine into their respective 3'-hydroxylated products. Notably, StCYP80B exhibited an expanded substrate selectivity compared to previously reported wild-type CYP80Bs, as it did not require an N-methyl group for hydroxylase activity. Furthermore, StCYP80B displayed a clear preference for the (S)-configuration. Co-expression of StCYP80B with the CYP450 reductases (CPRs, StCPR1, and StCPR2), also cloned from S. tetrandra, significantly enhanced the catalytic activity towards (S)-coclaurine. Site-directed mutagenesis of StCYP80B revealed that the residue H205 is crucial for coclaurine catalysis. Additionally, StCYP80B exhibited tissue-specific expression in plants. This study provides new genetic resources for the biosynthesis of BIAs and further elucidates their synthetic pathway in natural plant systems.
Cytochrome P-450 Enzyme System/chemistry*
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Benzylisoquinolines/chemistry*
;
Hydroxylation
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Plant Proteins/chemistry*
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Alkaloids/metabolism*
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Stephania tetrandra/genetics*


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