Issues with -a option, shogun pipeline command

[rahel31]

Hi, I would like to analyze my shallow shotgun metagenomics data according to the OGU method, https://journals.asm.org/doi/10.1128/msystems.00167-22
The recommended aligner is Shogun, especially I assume when using shallow data.
However I have issues running it:
shogun align
-i combined_seqs.fna
-a bowtie2
-d /srv/beegfs/scratch/users/p/parkr/Classifiers/WoL_Globus_full/databases/shogun
-o shogun_wol_align

I get error:
Traceback (most recent call last):
File "/var/spool/slurmd/job13597238/slurm_script", line 8, in
sys.exit(cli())
File "/opt/ebsofts/QIIME2/2021.8/lib/python3.8/site-packages/click/core.py", line 829, in call
return self.main(*args, **kwargs)
File "/opt/ebsofts/QIIME2/2021.8/lib/python3.8/site-packages/click/core.py", line 782, in main
rv = self.invoke(ctx)
File "/opt/ebsofts/QIIME2/2021.8/lib/python3.8/site-packages/click/core.py", line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/opt/ebsofts/QIIME2/2021.8/lib/python3.8/site-packages/click/core.py", line 1066, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/opt/ebsofts/QIIME2/2021.8/lib/python3.8/site-packages/click/core.py", line 610, in invoke
return callback(*args, **kwargs)
File "/opt/ebsofts/QIIME2/2021.8/lib/python3.8/site-packages/click/decorators.py", line 21, in new_func
return f(get_current_context(), *args, **kwargs)
File "/home/users/p/parkr/.local/lib/python3.8/site-packages/shogun/main.py", line 78, in align
aligner_cl.align(input, output)
File "/home/users/p/parkr/.local/lib/python3.8/site-packages/shogun/aligners/bowtie2_aligner.py", line 32, in align
proc, out, err = bowtie2_align(infile, outfile, self.prefix,
File "/home/users/p/parkr/.local/lib/python3.8/site-packages/shogun/wrappers/bowtie2_wrapper.py", line 39, in bowtie2_align
return run_command(cmd, shell=shell)
File "/home/users/p/parkr/.local/lib/python3.8/site-packages/shogun/utils/_utils.py", line 54, in run_command
with subprocess.Popen(
File "/opt/ebsofts/QIIME2/2021.8/lib/python3.8/subprocess.py", line 858, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File "/opt/ebsofts/QIIME2/2021.8/lib/python3.8/subprocess.py", line 1704, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'bowtie2'

If I don't provide -a , to use burst, then I get error :
FileNotFoundError: [Errno 2] No such file or directory: 'burst15'

Whe I give it the directory bowtie2 from WoL database:
I get error:
Error: Invalid value for '-a' / '--aligner': invalid choice: /srv/beegfs/scratch/users/p/parkr/Classifiers/WoL_Globus_full/databases/bowtie2. (choose from all, bowtie2, burst, utree)

In the WoL_Globus_full folder there are these folders/files:

When I copied the content of bowtie2 folder to the shogun folder, it didn't work either.
The pre-built WoL databases were downloaded from Globus ( https://biocore.github.io/wol/download )

Could you guide me how to make it work?

Thank you in advance!!

[bhillmann]

This looks like an installation problem, and you don't have the aligners in your path. Can you ensure that you install bowtie2 and that it is accessible on your path? The recommended way with conda requires the environment to be activated.

[rahel31]

Thank you! Indeed the bowtie2 was not correctly loaded!
I got now my taxatable, for the mock community, and shogun identifies from the mock community with 8 bacterial species, more than 300 taxa, and the community member Pseudomonas aeruginosa is not even present (other Pseudumonas species present at very low numbers). I was hoping for it to perform better than Kraken2 / Bracken as it should be adapted to the shallow data.. (sequencing depth - aiming 2mln reads per sample). Any tips how to reduce number of false positive (some are contamination, but not all, when comparing to negative controls) ?
Thank you in advance!