Protein tyrosine phosphatases (PTPs, EC 3.1.3.48) are key regulators of cellular processes, with the catalytic activity attributed to the conserved motif (H/V)CX₅R(S/T), where cysteine and arginine residues are critical. Previous studies revealed that alternative splicing of extracellular phosphatase mRNA precursors in Metarhizium anisopliae generated two distinct transcripts, with the longer sequence containing a novel HCPTPMLS motif resembling PTP signatures but lacking the arginine residue. To identify the novel signature motif and characterize its enzymatic properties, we heterologously expressed and purified both proteins in Pichia pastoris and comprehensively characterized their enzymatic properties. The protein containing the HCPTPMLS motif (designated as L-protein) exhibited the highest activity at pH 5.5 and a strong preference for pTyr substrates. Its phosphatase activity was inhibited by Ag⁺, Zn²⁺, Cu²⁺, molybdate, and tungstate, but enhanced by Ca²⁺ and EDTA. AcP101 (lacking HCPTPMLS) showed the maximal activity at pH 6.5 and a strong preference toward pNPP (P < 0.05), with the activity inhibited by NaF and tartrate, but enhanced by Mg²⁺ and Mn²⁺. Functional analysis confirmed that the L-protein retained the PTP activity despite the absence of arginine in its signature motif, while AcP101 functioned as an acid phosphatase. This study provides the first functional validation of an arginine-deficient PTP motif, expanding the definition of PTP signature motifs and offering new insights for phosphatase classification.
Metarhizium/genetics* ; Protein Tyrosine Phosphatases/chemistry* ; Amino Acid Motifs ; Recombinant Proteins/biosynthesis* ; Amino Acid Sequence ; Pichia/metabolism* ; Fungal Proteins/chemistry* ; Substrate Specificity ; Saccharomycetales

Objective To investigate the effects of nursing intervention on the rehabilitation of patients with benign paroxysmal positional vertigo (BPPV).Methods 64 BPPV patients were randomly divided into control group and observation group, with 32 cases in each group.The control group received otorhinolaryngology routine nursing, while the observation group was managed with continuously systemic nursing interventions, including manipulative re-duction, psychological nursing intervention, health education, head nursing, follow -up and family nursing interven-tion.The Hamilton Anxiety Scale (HAMA) and Hamilton Depression Rating Scale (HDRS) were applied to evaluate the intervention effects.Results Cure rate of the observation group was significantly higher than that of the control group, and recurrence rate of the observation group was obviously lower than that of the control group(p <0.05).The anxiety and depression assessment of the observation group was significantly lower than that of the control group, with statistical difference (p <0.05).Conclusion Systemic nursing intervention can effectively improve the rehabilita-tion of patients with BPPV, and reduce recurrence rate.

Objective: To study the effects of supplemented Yang Supplementing Five Returning Decoction on the blood lipid and immune function of the model mouse. Methods: Supplemented Yang Supplementing Five Returning Decoction is composed of Yang Supplementing Five Returning Decoction, Herba Epimedii and propolis. The effects of two formulae, Yang Supplementing Five Returning Decoction and Supplemented Yang Supplementing Five Returning Decoction on the blood lipid, the functions of nonspecific immunity, humoral immunity and cellular immunity were investigated on the normal and hyperlipemia rat models and immunosuppressive mouse model. Results: Supplemented Yang Supplementing Five Returning Decoction could not only maintain the original formula functions of lowering TC. TG and LDL C of rats ( P